List of cryptosystems

A cryptosystem is a set of cryptographic algorithms that map ciphertexts and plaintexts to each other.^[1]

Private-key cryptosystems

Private-key cryptosystems use the same key for encryption and decryption.

• Caesar cipher
• Substitution cipher
• Enigma machine
• Data Encryption Standard
• Twofish
• Serpent
• Camellia
• Salsa20
• ChaCha20
• Blowfish
• CAST5
• Kuznyechik
• RC4
• 3DES
• Skipjack
• Safer
• IDEA
• Advanced Encryption Standard, also known as AES and Rijndael.^[2]

Public-key cryptosystems

Public-key cryptosystems use a public key for encryption and a private key for decryption.

• Diffie–Hellman key exchange
• RSA encryption
• Rabin cryptosystem
• Schnorr signature
• ElGamal encryption
• Elliptic-curve cryptography
• Lattice-based cryptography
• McEliece cryptosystem
• Multivariate cryptography
• Isogeny-based cryptography