Classical
Caesar Cipher
Shifts each alphabetic character by a fixed offset.
Cryptography
Crypto Lab
Explore classical ciphers, symmetric ideas, public-key arithmetic, key exchange, and hashing with small inspectable examples.
Technique set
Choose a playground
ClassicalSymmetricPublic keyKey exchangeHashing
Classical
Vigenere Cipher
Uses a repeated keyword to apply a different Caesar shift to each letter.
Classical
Substitution Cipher
Maps each plaintext letter to another fixed letter.
Classical
Rail Fence Cipher
Writes text in a zigzag across rails, then reads each rail left to right.
Symmetric
XOR Cipher
Combines each byte with a repeated key byte using XOR.
Public key
RSA Demo
Builds tiny public/private keys from two primes, then encrypts a small number.
Key exchange
Diffie-Hellman Demo
Shows how two parties derive the same shared secret over a public channel.
Hashing
Hash Functions
Compresses a message into a fixed-size fingerprint.
Security boundary
These demos explain ideas, not production security
The lab intentionally uses small values and transparent steps. Real systems should rely on modern, reviewed libraries and protocols.