| Journal of Cybersecurity and Intelligent Systems

Received: 06 Aug 2026; Revised: 20 September 2026; Accepted: 22 September 2026; Published Online: 29 September 2026

J. Cybersecur. Intell. Syst., 2026, 1(1), 26505 | Volume 1 Issue 1 (September 2026) | DOI: https://doi.org/10.64189/cis.26505

This article is licensed under Creative Commons Attribution NonCommercial 4.0 International (CC-BY-NC 4.0)

Design and Implementation of Spring Security

Framework Using OAuth 2.0 for Spring Boot

Applications

Shameer Mohammed,

1, *

Ali Ibrahim Mohammed Lassakeur

and P. Rutravigneshwaran

Department of Computing and Information Sciences, University of Technology and Applied Sciences Sur, Ash Sharqiyah Sur, PC-411,

Sultanate of Oman

Department of Computer Science, Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu, 641021, India

*Email : shameer.mohammed@utas.edu.om (Shameer Mohammed)

Abstract

In modern web applications, ensuring secure authentication and authorization has become a critical

requirement for protecting sensitive data and maintaining user trust. This research focuses on implementing

an enhanced security model using encrypted OAuth 2.0 and JSON Web Tokens (JWT) within Spring Boot

applications. The primary objective is to strengthen authentication and authorization mechanisms by

integrating encryption techniques to secure tokens and communication channels between clients and servers.

This research emphasizes encrypting and decrypting OAuth 2.0 tokens and JWTs to enhance data confidentiality

and effectively manage role-based access control (RBAC). It presents the design and implementation of a secure

system by enhancing the standard OAuth 2.0 framework with comprehensive JWT encryption. Building on the

Spring Boot framework, the system leverages Spring Security to fortify the OAuth 2.0 flow. This approach

ensures that confidential user data, claims, and, most importantly, user roles are fully protected within the token

payload, preventing exposure even in the event of a token breach. The intended approach was rigorously

evaluated through security tests, including unit tests and manual penetration testing, to identify potential

vulnerabilities. The results demonstrate that integrating encrypted JWTs with the OAuth 2.0 protocol in Spring

Boot applications significantly enhances security by protecting token contents and securing the RBAC

mechanism that effectively mitigates risks associated with token interception, replay attacks, and privilege

escalation, which confirms the viability and effectiveness of this enhanced security model for modern, secure

application development.

Keywords: Spring boot; Spring security; OAuth 2.0; JSON Web Token; Encryption; Role-Based Access Control;

Authentication; Authorization; API security.

1. Introduction

OAuth 2.0 and JSON Web Tokens (JWT) have emerged as popular solutions for authentication and authorization

in modern web applications because of their scalability, flexibility and support for distributed architectures.

[1-3]

Traditional token-based security approaches have been widely used, but they focus mainly on ensuring the

integrity of tokens using electronic signatures.

[4,5]

Sensitive information included in JWT payloads may remain

exposed in the case of token interception. This may cause security problems such as unauthorized access, replay

attacks, the disclosure of user claims and privilege escalation, especially for applications using role-based access

control (RBAC) to make authorization decisions.

[4,6,7]

While several approaches, such as OAuth 2.0, JWT, Spring

Security, Keycloak, and multi-factor authentication, have been studied to improve application security, little

focus has been given to protecting the confidentiality of token contents and embedded role data by encrypting

the token.

[8-10]

Thus, a lightweight and secure framework with OAuth 2.0, encrypted JWTs and RBAC in the spring

boot ecosystem is needed. In this work, an enhanced authentication and authorization framework based on

encrypted OAuth 2.0 and JWT mechanisms using spring booting and spring security is proposed and

implemented. The proposed approach guarantees the contents of tokens through encryption, preserves user

claims and role information and improves RBAC enforcement while supporting stateless authentication

architectures. A proof-of-concept application was developed that included an authorization server, resource

server, encrypted token management and secure access control mechanisms.

[8]

The framework uses BCrypt

hashing for password protection and ensures the secure validation, refreshment, and revocation of tokens. The

use of communication based on HTTPS further improves the overall security of the system.

[11]

The main goal of

this work is to enhance data confidentiality, integrity and access control by integrating enhanced token

protection with the standard workflow of OAuth 2.0. The effectiveness of the proposed system is evaluated

through functional, security and penetration testing scenarios on authentication, authorization, token

expiration, token revocation and RBAC validation. The results show that the proposed framework provides an

additional layer of security against token interception, the disclosure of sensitive claims, replay attacks and

privilege escalation. The proposed solution offers a practical and secure way to handle modern Spring Boot

applications that require strong authentication and authorization mechanisms.

[9]

2. Literature survey

Several studies and technical papers have examined the development of secure authentication and

authorization mechanisms using OAuth 2.0 and JSON Web Tokens (JWT) within the context of modern web

applications. This review highlights the most relevant research focusing on web security, microservice

integration, and the role of spring booting and spring security in implementing robust access-control systems.

Nishat and Muzaffar et al. emphasize the need for stronger authentication and authorization in web applications

through the combined use of OAuth 2.0, JWT, and Multi-Factor Authentication (MFA).

[12]

Their work describes

OAuth 2.0 as a scalable authorization framework that allows secure access delegation without exposing user

credentials, whereas JWT provides a stateless mechanism for identity verification and claim transfer. They

highlight that although OAuth 2.0 and JWT are powerful, integrating MFA provides an additional safeguard

against credential theft and replay attacks, forming a multilayered defense for modern web applications.

Rahim et al. explored the use of Keycloak and OAuth 2.0 for secure authentication and authorization in a

microservice-based angular and spring boot application.

[13]

This study illustrates how distributed architectures

increase the complexity of security management, particularly when multiple microservices must independently

verify and authorize users. The implementation of Keycloak as an OAuth 2.0 Authorization Server offered

centralized identity management, role-based access control, and single-sign-on (SSO) functionality,

demonstrating how microservices can securely communicate via tokens issued and verified through a unified

identity provider. Manne et al. presented a detailed analysis of the spring security framework for securing Java-

based web applications.

[14]

This paper discussed Spring Security’s support for authentication mechanisms such

as form-based login, LDAP, and OAuth 2.0/OIDC, along with token-based authentication via JWT. The research

highlights the framework’s modular architecture, comprising AuthenticationManager, AccessDecisionManager,

and SecurityContext, which allows granular access control at both the HTTP and method levels. Moreover,

Spring Security’s ability to mitigate OWASP’s top 10 vulnerabilities (e.g., CSRF and XSS) through built-in

protection mechanisms was identified as a major advantage. Chaudhari et al. focused on secure API gateways

for financial lending platforms using the Java Spring ecosystem.

[15]

Their paper reviewed the role of the Spring

Cloud Gateway in enforcing authentication, authorization, rate-limiting, and payload inspection within

microservice architectures. It underscores the importance of token-based security (OAuth 2.0 and JWT) in

financial systems that handle sensitive user data and are subject to compliance standards such as the GDPR and

PCI-DSS. The authors showed that centralized API gateways can mitigate risks by validating and decrypting

tokens before routing requests to backend microservices, ensuring end-to-end data confidentiality and integrity.

Katta explores the integration of Spring Security with Amazon Web Services (AWS) to address security and

compliance challenges in financial services.

[7]

This study emphasizes the importance of a multilayered security

architecture that combines OAuth 2.0, JWT-based authentication, RBAC, ABAC, and encryption strategies using

AWS Key Management Service (KMS). The research highlights how financial institutions can leverage these

technologies to meet regulatory requirements such as the GDPR, PCI DSS, and SOX while maintaining scalability

and operational efficiency. This work underscores the relevance of combining application-level security

frameworks with cloud-native services to achieve defense-in depth. Zahir and Esenalieva provide a comparative

analysis of authentication methods in spring security, including basic authentication, JWT, and OAuth 2.0.

[16]

They detail the implementation steps, advantages, and security implications of each method. The authors note

that while Basic Authentication is simple and stateless, it is insecure without HTTPS; JWT offers scalability and

statelessness but requires careful key management; and OAuth 2.0 is praised for its delegation capabilities and

integration with third-party identity providers. This study reinforces the importance of token encryption and

secure role embedding to prevent token theft and privilege escalation. Dimitrijević et al. investigated advanced

security mechanisms such as JWT, OAuth 2.0, LDAP, and Keycloak within the spring ecosystem.

[17]

The authors

discussed how JWT enables stateless authentication in microservices, whereas OAuth 2.0 facilitates secure

authorization across distributed systems. The integration of LDAP and Keycloak simplifies identity management

and supports SSO. The authors emphasize enforcing HTTPS, encrypting tokens, and securely managing keys to

mitigate interception and replay attacks. Joshi examines the use of Java and Spring Boot in the development of

scalable and secure payment systems.

[18]

Matcha and Munish et al. realized the basic for robust token

management, authorization restrictions, and common threat protection in any OAuth-based solution.

[6]

Neelan

et al. investigated the various OAuth 2.0 grants and secure authorization practices on online, mobile, and API-

based platforms. Grasping how to handle security tokens, grant selection and authorization requirements.

[1]

Ollila et al. studied OAuth 2.0 authorization for enterprise integration platforms. For support and access

management, there should be standard frameworks of authorization obliged for secure integration of remote

services.

[2]

According to Johnson et al. the most critical features of web application cryptographic solutions were

encryption, security of keys, and transport-layer security of sensitive data. We have higher level of token-based

content protection than the signature-based ones.

[4]

Katta et al. encryption, access control, and cloud-native

security services improve organizational compliance, scalability, and sensitive application data protection.

[7]

This study highlights the role of the microservice architecture in achieving fault isolation and maintainability

and emphasizes the importance of encryption, tokenization, and PCI DSS compliance. The author concludes that

Spring Boot’s embedded security features and Java’s encryption libraries provide a strong foundation for secure

financial applications, aligning with this project’s goal of implementing encrypted JWTs and RBAC. Building

upon these foundations, the current study (2025) enhances the OAuth 2.0 and JWT security models by

introducing encryption of tokens within a Spring Boot application. Previous research has focused primarily on

signature-based token integrity; however, this project addresses the limitations of plain payload exposure. By

encrypting JWTs and implementing decryption mechanisms at the resource server, sensitive claims (including

user roles for the RBAC) remain confidential even if tokens are intercepted. This approach also mitigates

vulnerabilities such as replay attacks and privilege escalation, as noted in earlier works. The reviewed literature

consistently emphasizes the need for encrypted tokens, secure communication channels, and role-based access

control in modern authentication systems.

[19]

The combination of OAuth 2.0 and encrypted JWTs within the

Spring Boot framework emerges as a robust solution for protecting sensitive data and enforcing authorization

policies. These insights directly inform the design and implementation of the recommended approach, which

enhances security through token encryption, RBAC integration, and defense-in-depth principles.

2.1 Research gaps

Existing OAuth 2.0 and JWT solutions primarily ensure token integrity through signatures but provide limited

protection for token confidentiality and embedded RBAC information. This creates a need for a lightweight

Spring Boot framework that combines encrypted JWTs with secure role-based access control. The proposed

system addresses this gap by protecting both the token content and the user role through encryption.

2.2 Comparative analysis of existing works

According to Table 1, secure authorization frameworks, cryptographic protection, and OAuth-based

authentication have been the hub of contemporary indexed publications and standards-based endeavors.

Stimulating token secrecy and access control helps encrypted OAuth 2.0 and JWT frameworks.

Table 1: Comparative analysis of existing studies identified through the Systematic Literature Review (SLR)

Author(s) &

Year

Authentication

Method

Performance (Fast)

Security (Strong)

Encryption/Decryption

(Better)

Nishat &

Muzaffar

(2024)

[12]

OAuth 2.0 + JWT

+ MFA

Moderate: additional

verification steps slightly

affect response time

Very Strong: multifactor

verification greatly enhances

account protection

Basic: uses signed JWTs

without full encryption

Rahim (2021)

[13]

OAuth 2.0 +

Keycloak (SSO)

High: token reuse and

centralized management

improve speed

Strong: centralized access

control reduces credential

exposure

Basic: JWTs signed but not

encrypted by default

Manne

(2023)

[14]

Spring Security +

OAuth 2.0 + JWT

High: optimized Spring

integration ensures

efficient performance

Strong: robust CSRF and XSS

protection via Spring filters

Moderate: limited

encryption integration

through Spring Security

Chaudhari et

al. (2024)

[15]

OAuth 2.0 + JWT

via Spring Cloud

Gateway

High: centralized gateway

routing improves response

handling

Very Strong: enforces

authentication, rate-limiting,

and compliance (GDPR/PCI-

DSS)

Moderate: token inspection,

minimal encryption support

Katta

(2025)

[7]

OAuth 2.0 + JWT

+ RBAC + ABAC +

AWS KMS

High: scalable cloud-native

architecture maintains

performance

Very Strong: AWS KMS and

layered security ensure

regulatory compliance

Excellent: encryption and

decryption managed by AWS

Key Management Service

Zahir &

Basic Auth, JWT,

Moderate–High: depends

Strong: OAuth 2.0 most secure;

Moderate: recommends

Esenalieva

(2025)

[16]

OAuth 2.0

(comparative)

on method; JWT and OAuth

faster than Basic Auth

Basic Auth weakest without

HTTPS

token encryption for JWT

and OAuth

Dimitrijević et

al. (2023)

[17]

JWT + OAuth 2.0

+ LDAP +

Keycloak

High: stateless JWT

improves microservice

scalability

Very Strong: SSO and LDAP

integration strengthen identity

control

Better: recommends

enforced encryption and

secure key management

Joshi

(2021)

[18]

Spring Boot +

JWT + Encryption

High: lightweight

microservices optimize

processing

Strong: encryption and

tokenization protect payment

data

Better: uses Java

cryptography and token

encryption

Hardt et al.

(2023)

[3]

OAuth 2.1

Authorization

Framework

High-reduced complexity

Very Strong tokens

Strong encryption

Lodderstedt

et al.

(2025)

[11]

OAuth 2.0

Security Best

Practice

High

Very Strong

Strong

Spring

Security Team

(2025)

[8]

OAuth 2.0

Resource Server

with JWT

High performance

Strong security exhibited

Better encryption technique

OpenID

Foundation

(2024)

[10]

OpenID Connect

with OAuth 2.0

High

Very Strong

Strong

Proposed

System

Encrypted OAuth

2.0 + JWT + RBAC

High: optimized token

validation and decryption

maintain speed

Very Strong: encrypted tokens

and RBAC prevent privilege

escalation

Excellent: full token

encryption/decryption

ensures maximum

confidentiality

2.3 Comparative discussion

Most existing approaches rely on signed JWTs that protect integrity but not confidentiality. In contrast, the

proposed framework combines OAuth 2.0, encrypted JWTs, and RBAC in Spring Boot to safeguard both token

contents and role information against unauthorized disclosure and privilege escalation.

Novelty: The proposed work integrates OAuth 2.0, JWT security, and RBAC enforcement into a unified spring

boot framework with token lifecycle management and enhanced protection of role information.

Replay-Attack Prevention: Replay attacks are mitigated through token expiration, refresh-token validation,

token revocation, and server-side verification mechanisms that reject expired or reused credentials.

3. Methodology

3.1 System architecture

The anticipated approach architecture enhances the standard OAuth 2.0 and JWT models by integrating

encryption and decryption mechanisms for secure token management and role-based access control (RBAC).

The system is built on the Spring Boot framework and uses Spring Security to handle authentication,

authorization, and token encryption seamlessly.

[3,5,8]

Keywords:

Encrypted OAuth 2.0 Tokens: User passwords are securely saved using BCrypt hashing, while JWT privacy is

ensured through encryption tools such as RSA. Token integrity is further defended through cryptographic

signing and validation. The access and refresh tokens generated by the authorization server are encrypted using

algorithms such as BCrypt, ensuring confidentiality even if the token is intercepted.

Encrypted JWT Payloads: JWTs contain user claims and roles, which are encrypted before issuance and

decrypted by the resource server during validation.

Role-based Access Control (RBAC): User roles and permissions are embedded securely within encrypted tokens,

preventing unauthorized access or privilege escalation.

Secure Communication Channels: All communication between clients, servers, and microservices is secured via

HTTPS to prevent eavesdropping.

Integration with Spring Security: Spring Security filters manage token validation, access control, and exception

handling, ensuring consistent enforcement across all endpoints.

Stateless Authentication: The system remains scalable and stateless and is suitable for distributed

environments such as microservices or cloud applications.

Architectural workflow:

Fig. 1 depicts the OAuth2 and Spring Security authentication architecture for secure user authentication, token

validation, and resource access with the below steps:

Step1: A user sends an authentication request to the authorization server.

Step2: The authorization server authenticates the credentials and generates an encrypted JWT access token.

Step3: The token is returned to the client application.

Step4: User enters the encrypted token in the authorization header of later requests to the resource server.

Step5: The resource server decrypts and validates the token, checking claims and roles before granting

access to protected APIs.

Step6: All actions and validations are performed over secure HTTPS connections.

Fig. 1: Flow of proposed architecture.

3.2 System design

3.2.1 Use case diagram

The system supports the following primary actors and use cases:

User: Register, Login, Access Protected Resources, Logout, Refresh Token

Authorization Server: Authenticate Users, Issue Encrypted Tokens, Validate Tokens

Resource Server: Decrypt Tokens, Validate Roles, Grant/Deny Access

3.2.2 Activity diagram

In the activity flow, a user registration is done with BCrypt password encryption, then the user logs in with

credential validation, then Token generation and encryption take place, then token validation and decryption

on the API request is done, then RBAC enforcement based on decrypted roles is carried out and then token

refreshment and revocation handling happens.

3.2.3 Sequence diagrams

Authenticate the user sequence: In Fig. 2, the client sends credentials to the Authorization Server, which then

validates them against the User_Info database of Table 2 before generating an encrypted JWT access token and

refresh tokens to returned to the client.

Authentication Manager validates. Upon successful authentication, the system generates an encrypted JWT with

embedded roles and sends the token to the client for subsequent requests.

Refresh the token sequence: In Fig. 4, client sends an expired access token with a valid refresh token; server

validates the refresh token from the Refresh_Token database of Table 3. If valid and not revoked, a new

encrypted access token is issued; an old refresh token may be rotated for security.

[3,5,8,9]

Fig. 2: User authentication sequence.

Fig. 3: Login sequence flow.

Fig. 4: Refresh token sequence.

3.3 Database design

As shown in Table 2, the User_Info table stores essential user details required for authentication, authorization,

and role management within the system.

Table 2: User information table

Column

Data Type

Constraints

Description

BIGINT

PRIMARY KEY,

AUTO_INCREMENT

Unique identifier for the user

user_name

VARCHAR(255)

NOT NULL

The display name of the user

email_id

VARCHAR(100)

NOT NULL

The user’s email, used for login

Password

VARCHAR(225)

NOT NULL

BCrypt-hashed password

mobile_number

VARCHAR(20)

User’s mobile number

Roles

VARCHAR(255)

NOT NULL

ROLE_USER/ROLE_ADMIN/ROLE_MANAGER

As presented in Table 3, the Refresh_Token table defines the roles and permissions that support the RBAC

mechanism adopted in the system.

Table 3: Information about refresh token

Column

Data Type

Constraints

Description

BIGINT

PRIMARY KEY, AUTO_INCREMENT

Unique identifier for the token record

refresh_token

TEXT

NOT NULL

The encrypted refresh token string

revoked

BOOLEAN

NOT NULL, DEFAULT = FALSE

True if token revoked

user_id

BIGINT

FOREIGN KEY (USER_INFO.id)

Reference to the user who owns this token

3.4 Functional requirements

The proposed framework uses encrypted JWTs and spring security for implementing a secure OAuth 2.0 based

authentication and authorization method. User identities are verified against saved credentials and then

encrypted access and refresh tokens are issued. Authorization is enforced via Role-Based Access Control (RBAC)

and roles and permissions are securely encoded into JWT claims. RSA based token encryption, signature

verification and custom token validation filters are used to ensure that tokens are genuine, authentic and secret.

We use refresh token rotation, automatic expiration handling, and token revocation methods to ensure token

lifetime management. Proposed API access solution is secure and scalable User credentials are hashed with

Bcrypt; all protected resources are only available with the confirmed JWTs.

3.5 Nonfunctional requirements

Non-functional security is managed by HTTPS, encrypted JWTs and Spring Security mechanisms. It provides

high performance with stateless token validation. Robustness with secure token lifecycle management. System

scalability for growing user bases and microservices deployment. Modular architecture easy to maintain Easy

to use, clear API responses and informative error messages.

3.6 Implementation requirements

Table 4 shows the software required for this system to be developed.

Table 4: List of software’s used

Component

Tools

IDE

Spring Tools Suite (STS)

Frontend

POSTMAN

Backend

MySQL/H2

Application Server

Apache Tomcat (embedded in Spring Boot)

Framework

Spring Boot and Spring Security

Programming Language

Java (Spring Boot)

Scripting Language

JavaScript

Middleware

RESTful APIs for communication between client and server

Documentation

Microsoft Word for project documentation

Table 5 represents the hardware requirements for this system to be implemented.

Table 5: Hardware details

Component

Minimum

Recommended

Operating System

Windows 10

Windows 11

RAM

8 GB

16 GB or higher

Processor

Intel Core i5 or equivalent

Intel Core i7 or higher

Hard Disk Space

1TB free space

2 TB or more for development and deployment

4. Experiments and results

4.1 Prototype testing scenarios

The proposed application was tested through the following scenarios to validate the security model:

Scenario 1: User creation and access token generation scenario a new user was created in the system with

assigned roles. Upon successful registration, the system generated an encrypted JWT access token. Then the

token was verified to contain encrypted payload with embedded role information.

Scenario 2: Role-based access control enforcement scenario; Admin Access Test: A user with ROLE_USER

attempted to access and administer only the endpoint. The system correctly denied access with an authorization

error, confirming RBAC enforcement. For performing a manager access test; a user with ROLE_MANAGER

attempted to access manager-authorized endpoints. The system granted access successfully, validating role-

based permissions.

Scenario 3: In database verification, the User_Info Table 2 was inspected to confirm the Passwords stored as

BCrypt hashes (not plaintext). Role assignments correctly persisted. The Refresh_Token table was verified to

ensure the encrypted refresh tokens stored with proper user associations and Revocation flags works correctly

Scenario 4: For authentication flow testing scenario users are successfully authenticated with valid credentials

using Username/Password Sign-In module. Upon login, encrypted JWT access tokens were generated and

returned with the help of Access token retrieval functionality. And clients will use the access token to

successfully access protected resources with the help of Authenticated API access module. After 1 minute

(configured expiration), the token was rejected as expired, demonstrating proper TTL enforcement is

performed using Token expiration test functionality.

Scenario 5: Refreshing the token mechanism is tested in this scenario when the access token expired, the client

submitted the refresh token to the refresh endpoint where the system validated the refresh token against the

database, and a new encrypted access token was issued successfully. The old refresh token was optionally

rotated for enhanced security.

Scenario 6: Logout and token revocation is tested with the user-initiated logout through the logout endpoint

then the refresh token was marked as revoked in the database. Subsequent attempts to use the revoked refresh

token were rejected then access tokens were invalidated via server-side validation mechanisms.

4.2 Security testing results

The system underwent rigorous security testing as described in the previous section. Fig. 5 exhibits few sample

test cases after performing unit testing where Individual components (encryption/decryption modules, token

filters, and RBAC validators) were tested in isolation. Then simulated attacks includes token interception

attempts (mitigated by encryption), replay attack attempts (mitigated by token expiration and validation),

privilege escalation attempts (mitigated by encrypted RBAC enforcement) and CSRF attack prevention (verified

through Spring Security configurations).

Fig. 5: Testing scenarios snapshot.

4.3 Results summary

The results demonstrate that integrating encrypted JWT with the OAuth 2.0 protocol in Spring Boot apps greatly

improves security, providing confidentiality and integrity of the token and role data in the face of no access or

change. Sensitive data is also encrypted when sent. Server-level decryption and validation is performed to avoid

privilege escalation. Token expiration and refresh techniques may also be used to mitigate the risk of replay

attacks by limiting the validity time of compromised tokens.

4.4 Performance evaluation and metrics

The current work focuses primarily on the design, implementation, and security validation of the proposed

encrypted OAuth 2.0 and JWT framework. Quantitative metrics such as latency, throughput, and computational

overhead were not evaluated in the present study and are acknowledged as limitations. A dedicated subsection

discussing this limitation has been added to the Results section, and comprehensive performance benchmarking

has been included in the Future Recommendations section.

4.5 Limitations

The suggested OAuth2-based authentication system enhances security by token-based authorization and role-

based access control but has limitations. For large distributed systems with heavy user loads testing may have

to go beyond the framework. The study is focused on the authentication and authorization, not zero-day and

sophisticated insider threats. Deep performance analysis and advanced threat detection.

5. Future recommendations

This research provides a robust foundation for secure authentication and authorization using encrypted OAuth

2.0 and JWTs within the spring boot ecosystem. The enhancements are recommended for future development

can include the inclusion of multi-factor authentication (MFA), the use of better encryption and key

management systems, the extension of the framework to microservices and cloud-native settings, and the

implementation of Attribute-Based Access Control (ABAC). Moreover, automated security testing, thorough

audit logging, OAuth 2.1/OIDC compliance and large-scale performance evaluation can further improve the

security, scalability and practical usability of the suggested solution.

6. Conclusion

The anticipated logic has been carefully studied and analyzed with the help of the required workflow diagrams

to understand all major processes. The implementation was planned to use suitable tools and techniques to

address the vulnerabilities inherent in traditional and unencrypted token-based systems. This system achieved

its primary objective of strengthening authentication and authorization mechanisms by integrating encrypted

OAuth 2.0 and JSON Web Tokens (JWT) within a spring boot environment. The system ensures higher data

confidentiality and integrity than standard implementations through complete encryption of JWT payloads

containing user claims and roles, secure role-based access control with roles embedded in encrypted tokens,

statelessness suitable for distributed and microservice architectures, integration with spring security for

comprehensive endpoint protection, token lifecycle management, including expiration, refresh, and revocation.

Security tests (unit tests, manual penetration testing) confirmed the system's resilience to common threats such

as token interception, replay attacks, and privilege escalation. This research confirms the feasibility and

efficiency of this improved security model for the construction of modern secure applications. The limitation of

this study is the lack of quantitative performance benchmarking and future work will address latency,

throughput, scalability and computational overhead introduced by encrypted JWT processing. By combining

OAuth 2.0, encrypted JWTs, RBAC and Spring Security, result a robust, scalable, maintainable method to protect

sensitive data by enforcing authorization policies in modern web applications.

CRediT Author Contribution Statement

Shameer Mohammed: Conceptualization, Formal analysis, Methodology, Project administration, Software,

Supervision, Validation, Writing - Original draft, Writing - Review & editing. Ali Ibrahim Mohammed

Lassakeur: Data curation, Investigation, Software, Validation, Visualization. P. Rutravigneshwaran: Formal

analysis, Methodology, Resources, Supervision, Writing - Review & editing.

Funding Declaration

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-

profit sectors.

Data Availability Statement

No data were generated or analyzed during the current study. Therefore, data sharing is not applicable to this

article.

Conflict of Interest

There is no conflict of interest.

Artificial Intelligence (AI) Use Disclosure

The authors declare that artificial intelligence (AI)-assisted tools were used only for language refinement,

grammar improvement, and manuscript structuring purposes during the preparation of this work. All technical

content, experimental implementation, results, and interpretations were independently developed and verified

by the authors.

Supporting Information

Not applicable

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