 Examples of popular symmetric-key algorithms include Twofish, Serpent, AES (Rijndael), Camellia, Salsa20, ChaCha20, Blowfish, CAST5, Kuznyechik, RC4, DES, 3DES, Skipjack, Safer, and IDEA.Symmetric ciphers are commonly used to achieve other cryptographic primitives than just encryption.Encrypting a message does not guarantee that this message is not changed while encrypted.