Security & Cryptography
Master cryptographic algorithms, security protocols, and secure system design from first principles
Cryptography & Security Examples
Build secure systems and understand cryptographic fundamentals
HTTPS Server with OpenSSL
Build a secure HTTPS server implementing TLS handshake and certificate management
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RSA Encryption From Scratch
Implement RSA key generation, encryption, and decryption algorithms
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HMAC Signing & Verification
Create secure message authentication codes for data integrity
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Password Hashing System
Implement secure password hashing with bcrypt/argon2 from scratch
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TLS Handshake Simulator
Simulate the TLS handshake process without actual encryption
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JWT Token System
Build a complete JWT implementation with signing and verification
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AES Encryption Engine
Implement the Advanced Encryption Standard from the ground up
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Cryptography Learning Journey
Build expertise from basic hashing to advanced cryptographic protocols
Hash functions and message authentication
Symmetric encryption algorithms
Public key cryptography and RSA
TLS/SSL and secure protocols
Prerequisites
- Understanding of mathematical concepts (modular arithmetic, prime numbers)
- Knowledge of hash functions and their properties
- Basic understanding of network protocols
- Experience with bit manipulation and binary operations
- Familiarity with security concepts and threat models
What You'll Learn
- Cryptographic algorithm implementation from scratch
- Secure protocol design and implementation
- Side-channel attack prevention techniques
- Key management and certificate handling
- Security audit and vulnerability assessment
Cryptographic Primitives
Fundamental building blocks of secure systems
SHA-256
Cryptographic hash function
AES
Symmetric encryption standard
RSA
Public key cryptography
ECDSA
Elliptic curve signatures
HMAC
Message authentication codes
PBKDF2
Password-based key derivation
Diffie-Hellman
Key exchange protocol
X.509
Digital certificate format
🔒 Security Notice
These examples are for educational purposes only. Never use custom cryptographic implementations in production systems. Always use well-tested, audited libraries for real-world applications. These implementations help you understand the underlying concepts but may contain vulnerabilities.
Security Tools & Libraries
Professional tools for security analysis and development
OpenSSL
Cryptography and SSL/TLS toolkit
Wireshark
Network protocol analyzer
Metasploit
Penetration testing framework
Burp Suite
Web application security testing
Secure Your Applications
These security examples are coming soon. Explore other advanced programming topics!