Classical Cryptography Simulator

HMAC & CMAC

Interactive simulation of Hash-based MAC and Cipher-based MAC. Compare HMAC and CMAC implementations with real-time examples and understand message authentication.

MAC Generation
Generate Message Authentication Code

Secure Hash Algorithm 256-bit

MAC Verification
Verify message integrity and authenticity
Control Panel
HMAC vs CMAC
Key differences between the two approaches

HMAC

  • • Uses hash functions
  • • Key padding with ipad/opad
  • • Algorithm independent
  • • Widely supported

CMAC

  • • Uses block ciphers
  • • Subkey derivation
  • • Variable length output
  • • Better for hardware
Performance Comparison
Speed and efficiency characteristics
Computation Speed
HMAC: Fast | CMAC: Medium
Security Level
Both: High
Implementation
HMAC: Simple | CMAC: Complex
Real-World Applications
Where HMAC and CMAC are used in practice

Network Security

  • • IPsec ESP
  • • TLS record layer
  • • SSH message integrity

Banking Systems

  • • ATM transactions
  • • SWIFT messages
  • • Payment processing

Cloud Services

  • • AWS signatures
  • • API authentication
  • • Message queues