What Is a Firewall? Types, Functions, and How It Secures Networks

This comprehensive guide explains what a firewall is, its origins, the hardware and software types, session management, NAT, VPN, security zones, policies, threat mitigation, DoS protection, IDS/IPS, deep inspection, and performance considerations, providing a solid foundation for anyone interested in network security.

DoS protectionIDSIPS

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What Is a Firewall? Types, Functions, and How It Secures Networks

Top Architect

Jun 22, 2020 · Information Security

Implementing Token-Based Authentication, Anti‑DoS, and Repeat‑Submission Prevention in Spring Boot

This article explains how to design a secure token mechanism with timestamp validation, describes common DoS attack types, and provides practical Spring Boot code examples—including Redis configuration, token generation, interceptor logic, MD5 signing utilities, and ThreadLocal usage—to prevent repeat submissions and protect APIs.

DoS protectionSpring BootThreadLocal

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Implementing Token-Based Authentication, Anti‑DoS, and Repeat‑Submission Prevention in Spring Boot

Selected Java Interview Questions

Jun 17, 2020 · Information Security

API Security Practices: Tokens, Timestamps, Signatures, and Anti‑Replay Measures with Java Examples

This article explains common API security mechanisms such as token and user token usage, timestamp validation, signature generation, anti‑replay strategies, DoS attack types, and provides Java Spring Boot code examples for token handling, request interception, custom annotations, and ThreadLocal utilities.

API SecurityDoS protectionJava Spring

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API Security Practices: Tokens, Timestamps, Signatures, and Anti‑Replay Measures with Java Examples