| # Kyber |
| |
| - **Algorithm type**: Key encapsulation mechanism. |
| - **Main cryptographic assumption**: Module LWE+R with base ring Z[x]/(3329, x^256+1). |
| - **Principal submitters**: Peter Schwabe. |
| - **Auxiliary submitters**: Roberto Avanzi, Joppe Bos, Léo Ducas, Eike Kiltz, Tancrède Lepoint, Vadim Lyubashevsky, John M. Schanck, Gregor Seiler, Damien Stehlé. |
| - **Authors' website**: https://pq-crystals.org/ |
| - **Specification version**: NIST Round 3 submission. |
| - **Primary Source**<a name="primary-source"></a>: |
| - **Source**: https://github.com/pq-crystals/kyber/commit/b628ba78711bc28327dc7d2d5c074a00f061884e with copy_from_upstream patches |
| - **Implementation license (SPDX-Identifier)**: CC0-1.0 or Apache-2.0 |
| - **Optimized Implementation sources**: https://github.com/pq-crystals/kyber/commit/b628ba78711bc28327dc7d2d5c074a00f061884e with copy_from_upstream patches |
| - **oldpqclean-aarch64**:<a name="oldpqclean-aarch64"></a> |
| - **Source**: https://github.com/PQClean/PQClean/commit/8e220a87308154d48fdfac40abbb191ac7fce06a with copy_from_upstream patches |
| - **Implementation license (SPDX-Identifier)**: CC0-1.0 and (CC0-1.0 or Apache-2.0) and (CC0-1.0 or MIT) and MIT |
| |
| |
| ## Parameter set summary |
| |
| | Parameter set | Parameter set alias | Security model | Claimed NIST Level | Public key size (bytes) | Secret key size (bytes) | Ciphertext size (bytes) | Shared secret size (bytes) | |
| |:---------------:|:----------------------|:-----------------|---------------------:|--------------------------:|--------------------------:|--------------------------:|-----------------------------:| |
| | Kyber512 | NA | IND-CCA2 | 1 | 800 | 1632 | 768 | 32 | |
| | Kyber768 | NA | IND-CCA2 | 3 | 1184 | 2400 | 1088 | 32 | |
| | Kyber1024 | NA | IND-CCA2 | 5 | 1568 | 3168 | 1568 | 32 | |
| |
| ## Kyber512 implementation characteristics |
| |
| | Implementation source | Identifier in upstream | Supported architecture(s) | Supported operating system(s) | CPU extension(s) used | No branching-on-secrets claimed? | No branching-on-secrets checked by valgrind? | Large stack usage?‡ | |
| |:-----------------------------------------:|:-------------------------|:----------------------------|:--------------------------------|:------------------------|:-----------------------------------|:-----------------------------------------------|:----------------------| |
| | [Primary Source](#primary-source) | ref | All | All | None | True | True | False | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,BMI2,POPCNT | True | True | False | |
| | [oldpqclean-aarch64](#oldpqclean-aarch64) | aarch64 | ARM64\_V8 | Linux,Darwin | None | True | False | False | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ‡For an explanation of what this denotes, consult the [Explanation of Terms](#explanation-of-terms) section at the end of this file. |
| |
| ## Kyber768 implementation characteristics |
| |
| | Implementation source | Identifier in upstream | Supported architecture(s) | Supported operating system(s) | CPU extension(s) used | No branching-on-secrets claimed? | No branching-on-secrets checked by valgrind? | Large stack usage? | |
| |:-----------------------------------------:|:-------------------------|:----------------------------|:--------------------------------|:------------------------|:-----------------------------------|:-----------------------------------------------|:---------------------| |
| | [Primary Source](#primary-source) | ref | All | All | None | True | True | False | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,BMI2,POPCNT | True | True | False | |
| | [oldpqclean-aarch64](#oldpqclean-aarch64) | aarch64 | ARM64\_V8 | Linux,Darwin | None | True | False | False | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Kyber1024 implementation characteristics |
| |
| | Implementation source | Identifier in upstream | Supported architecture(s) | Supported operating system(s) | CPU extension(s) used | No branching-on-secrets claimed? | No branching-on-secrets checked by valgrind? | Large stack usage? | |
| |:-----------------------------------------:|:-------------------------|:----------------------------|:--------------------------------|:------------------------|:-----------------------------------|:-----------------------------------------------|:---------------------| |
| | [Primary Source](#primary-source) | ref | All | All | None | True | True | False | |
| | [Primary Source](#primary-source) | avx2 | x86\_64 | Linux,Darwin | AVX2,BMI2,POPCNT | True | True | False | |
| | [oldpqclean-aarch64](#oldpqclean-aarch64) | aarch64 | ARM64\_V8 | Linux,Darwin | None | True | False | False | |
| |
| Are implementations chosen based on runtime CPU feature detection? **Yes**. |
| |
| ## Explanation of Terms |
| |
| - **Large Stack Usage**: Implementations identified as having such may cause failures when running in threads or in constrained environments. |
