CRYSTALS-Kyber
- Algorithm type: key encapsulation mechanism
- Main cryptographic assumption: module learning with errors (MLWE)
- Scheme authors: Roberto Avanzi, Joppe Bos, Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, John M. Schanck, Peter Schwabe, Gregor Seiler, Damien Stehle
- Authors’ website: https://pq-crystals.org/kyber
- Version: NIST Round 2 submission
Implementation
- Source of implementation: https://github.com/pq-crystals/kyber
- Implementation version: https://github.com/PQClean/PQClean/commit/c50bc64a40ce83639cff54419fce60483a30c430
- License: Public domain
- Constant-time: Yes
- Optimizations: Portable C with AVX2 instructions (if available at run-time)
Parameter sets
| Parameter set | Security model | Claimed NIST security level | Public key size (bytes) | Secret key size (bytes) | Ciphertext size (bytes) | Shared secret size (bytes) |
|---|---|---|---|---|---|---|
| Kyber512 | IND-CCA | 1 | 800 | 1632 | 736 | 32 |
| Kyber512-90s | IND-CCA | 1 | 800 | 1632 | 736 | 32 |
| Kyber768 | IND-CCA | 3 | 1184 | 2400 | 1088 | 32 |
| Kyber768-90s | IND-CCA | 3 | 1184 | 2400 | 1088 | 32 |
| Kyber1024 | IND-CCA | 5 | 1568 | 3168 | 1568 | 32 |
| Kyber1024-90s | IND-CCA | 5 | 1568 | 3168 | 1568 | 32 |