# FrodoKEM - **Algorithm type**: Key encapsulation mechanism. - **Main cryptographic assumption**: learning with errors (LWE). - **Principal submitters**: Michael Naehrig, Erdem Alkim, Joppe Bos, Léo Ducas, Karen Easterbrook, Brian LaMacchia, Patrick Longa, Ilya Mironov, Valeria Nikolaenko, Christopher Peikert, Ananth Raghunathan, Douglas Stebila. - **Authors' website**: https://frodokem.org/ - **Specification version**: NIST Round 3 submission. - **Primary Source**: - **Source**: https://github.com/microsoft/PQCrypto-LWEKE/commit/b6609d30a9982318d7f2937aa3c7b92147b917a2 - **Implementation license (SPDX-Identifier)**: 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) | |:-------------------:|:----------------------|:-----------------|---------------------:|--------------------------:|--------------------------:|--------------------------:|-----------------------------:| | FrodoKEM-640-AES | NA | IND-CCA2 | 1 | 9616 | 19888 | 9720 | 16 | | FrodoKEM-640-SHAKE | NA | IND-CCA2 | 1 | 9616 | 19888 | 9720 | 16 | | FrodoKEM-976-AES | NA | IND-CCA2 | 3 | 15632 | 31296 | 15744 | 24 | | FrodoKEM-976-SHAKE | NA | IND-CCA2 | 3 | 15632 | 31296 | 15744 | 24 | | FrodoKEM-1344-AES | NA | IND-CCA2 | 5 | 21520 | 43088 | 21632 | 32 | | FrodoKEM-1344-SHAKE | NA | IND-CCA2 | 5 | 21520 | 43088 | 21632 | 32 | ## FrodoKEM-640-AES 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) | master | All | All | None | True | True | False | | [Primary Source](#primary-source) | master | x86\_64 | Linux,Darwin,Windows | AVX2 | True | True | 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. ## FrodoKEM-640-SHAKE 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) | master | All | All | None | True | True | False | | [Primary Source](#primary-source) | master | x86\_64 | Linux,Darwin,Windows | AVX2 | True | True | False | Are implementations chosen based on runtime CPU feature detection? **Yes**. ## FrodoKEM-976-AES 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) | master | All | All | None | True | True | False | | [Primary Source](#primary-source) | master | x86\_64 | Linux,Darwin,Windows | AVX2 | True | True | False | Are implementations chosen based on runtime CPU feature detection? **Yes**. ## FrodoKEM-976-SHAKE 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) | master | All | All | None | True | True | False | | [Primary Source](#primary-source) | master | x86\_64 | Linux,Darwin,Windows | AVX2 | True | True | False | Are implementations chosen based on runtime CPU feature detection? **Yes**. ## FrodoKEM-1344-AES 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) | master | All | All | None | True | True | False | | [Primary Source](#primary-source) | master | x86\_64 | Linux,Darwin,Windows | AVX2 | True | True | False | Are implementations chosen based on runtime CPU feature detection? **Yes**. ## FrodoKEM-1344-SHAKE 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) | master | All | All | None | True | True | False | | [Primary Source](#primary-source) | master | x86\_64 | Linux,Darwin,Windows | AVX2 | True | True | 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.