List of cryptosystems explained

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

Notes and References

1. Web site: cryptosystem. TechTarget.com. Corinne Bernstein. Nov 1, 2021.
2. Web site: Symmetric-Key Cryptography. Roeder. Tom. www.cs.cornell.edu. en. 2017-02-05.