Kalyna (cipher)
Kalyna is a symmetric block cipher. It supports block sizes of 128, 256 or 512 bits; the key length is either equal to or double the block size.
Kalyna was adopted as the national encryption standard of Ukraine in 2015 after holding Ukrainian national cryptographic competition. Kalyna is a substitution-permutation network and its design is based on the Rijndael encryption function having quite different key schedule, another set of four different S-boxes and increased MDS matrix size.
Kalyna has 10 rounds for 128-bit keys, 14 rounds for 256-bit keys and 18 rounds for 512-bit keys. Independent researchers proposed some attacks on reduced-round variants of Kalyna, but all of them have a very high complexity and none of them are practical.
| Word size | Block size | Key size | Identification | Rounds |
| 64 bits | 128 bits | 1×128 = 128 bits | Kalyna-128/128 | 10 |
| 64 bits | 128 bits | 2×128 = 256 bits | Kalyna-128/256 | 14 |
| 64 bits | 256 bits | 1×256 = 256 bits | Kalyna-256/256 | 14 |
| 64 bits | 256 bits | 2×256 = 512 bits | Kalyna-256/512 | 18 |
| 64 bits | 512 bits | 1×512 = 512 bits | Kalyna-512/512 | 18 |
