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NTRU-Prime

  • Algorithm type: Key encapsulation mechanism.
  • Main cryptographic assumption: NTRU.
  • Principal submitters: Daniel J. Bernstein, Chitchanok Chuengsatiansup, Tanja Lange, Christine van Vredendaal.
  • Authors’ website: https://ntruprime.cr.yp.to
  • Specification version: supercop-20200826.
  • Implementation source: https://github.com/PQClean/PQClean/commit/6c1ea921ee4a06a6b50c742ca540bb9b5e51aee2, which takes it from:
    • https://github.com/jschanck/package-pqclean/tree/4d9f08c3/ntruprime, which takes it from:
    • supercop-20210604
  • Implementation license (SPDX-Identifier): Public domain.

Parameter set summary

Parameter set Security model Claimed NIST Level Public key size (bytes) Secret key size (bytes) Ciphertext size (bytes) Shared secret size (bytes)
ntrulpr653 IND-CCA2 2 897 1125 1025 32
ntrulpr761 IND-CCA2 3 1039 1294 1167 32
ntrulpr857 IND-CCA2 4 1184 1463 1312 32
sntrup653 IND-CCA2 2 994 1518 897 32
sntrup761 IND-CCA2 3 1158 1763 1039 32
sntrup857 IND-CCA2 4 1322 1999 1184 32

ntrulpr653 implementation characteristics

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?‡
clean All All None True True False
avx2 x86_64 Linux,Darwin AVX2 False 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.

ntrulpr761 implementation characteristics

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?
clean All All None True True False
avx2 x86_64 Linux,Darwin AVX2 False True False

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

ntrulpr857 implementation characteristics

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?
clean All All None True True False
avx2 x86_64 Linux,Darwin AVX2 False True False

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

sntrup653 implementation characteristics

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?
clean All All None True True False
avx2 x86_64 Linux,Darwin AVX2 False True False

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

sntrup761 implementation characteristics

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?
clean All All None True True False
avx2 x86_64 Linux,Darwin AVX2 False True False

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

sntrup857 implementation characteristics

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?
clean All All None True True False
avx2 x86_64 Linux,Darwin AVX2 False 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.







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