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liboqs/docs/algorithms/kem/ntru.md
Bruce 390b906d19
Patch ICICLE ML-KEM for deterministic encapsulation (#2258) 
* patch ICICLE ML-KEM to include enc_derand, but they are not tested

Signed-off-by: Ganyu (Bruce) Xu <g66xu@uwaterloo.ca>

* copy_from_upstream.py added deterministic encapsulation info to NTRU docs

Signed-off-by: Ganyu (Bruce) Xu <g66xu@uwaterloo.ca>

---------

Signed-off-by: Ganyu (Bruce) Xu <g66xu@uwaterloo.ca>
2025-09-15 10:09:26 -04:00

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NTRU

  • Algorithm type: Key encapsulation mechanism.
  • Main cryptographic assumption: NTRU in Z[x]/(q, x^n-1) with prime n and power-of-two q.
  • Principal submitters: John M. Schanck.
  • Auxiliary submitters: Cong Chen, Oussama Danba, Jeffrey Hoffstein, Andreas Hülsing, Joost Rijneveld, Tsunekazu Saito, Peter Schwabe, William Whyte, Keita Xagawa, Takashi Yamakawa, Zhenfei Zhang.
  • Authors' website: https://ntru.org/
  • Specification version: NIST Round 3 submission.
  • Primary Source:
    • Source: 4c9e5a3aa7
    • Implementation license (SPDX-Identifier): CC0-1.0
  • Ancestors of primary source:

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) Keypair seed size (bytes) Encapsulation seed size (bytes)
NTRU-HPS-2048-509 NA IND-CCA2 1 699 935 699 32 NA NA
NTRU-HPS-2048-677 NA IND-CCA2 3 930 1234 930 32 NA NA
NTRU-HPS-4096-821 NA IND-CCA2 5 1230 1590 1230 32 NA NA
NTRU-HPS-4096-1229 NA IND-CCA2 5 1842 2366 1842 32 NA NA
NTRU-HRSS-701 NA IND-CCA2 3 1138 1450 1138 32 NA NA
NTRU-HRSS-1373 NA IND-CCA2 5 2401 2983 2401 32 NA NA

NTRU-HPS-2048-509 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 clean All All None True True False
Primary Source avx2 x86_64 Linux,Darwin AVX2,BMI2 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 section at the end of this file.

NTRU-HPS-2048-677 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 clean All All None True True False
Primary Source avx2 x86_64 Linux,Darwin AVX2,BMI2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

NTRU-HPS-4096-821 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 clean All All None True True False
Primary Source avx2 x86_64 Linux,Darwin AVX2,BMI2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

NTRU-HPS-4096-1229 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 clean All All None True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

NTRU-HRSS-701 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 clean All All None True True False
Primary Source avx2 x86_64 Linux,Darwin AVX2,BMI2 True True False

Are implementations chosen based on runtime CPU feature detection? Yes.

NTRU-HRSS-1373 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 clean All All None 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.