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SHA-2

SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001. They are built using the Merkle–Damgård construction, from a one-way compression function itself built using the Davies–Meyer structure from a specialized block cipher.

Standards, Applications & Measurement

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Applications

TLSSSLPGPSSHS/MIME
24 related topics

Cryptanalysis and validation

BitsMessage digestBrute forcePreimage attackCollision
16 related topics

Implementations

BotanBouncy CastleCryptlibCrypto++Libgcrypt
16 related topics

Comparison of SHA functions

Right logical shiftModular additionX8632-bit64-bit
11 related topics

Key facts & relationships

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Certification
FIPS PUB 180-4, CRYPTREC, NESSIE
Designers
National Security Agency
Digest sizes
224, 256, 384, or 512 bits
First published
2001; 25 years ago (2001)
Rounds
64 or 80
Series
(SHA-0), SHA-1, SHA-2, SHA-3

Topics to explore

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Overview

Hash standard

Applications

Cryptanalysis and validation

Test vectors

Pseudocode

Comparison of SHA functions

Implementations

Advanced semantic analysis

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Map overview Semantic statistics

SHA-2

Nodes97
Edges96
Triples92
Avg. degree1.98
Density0.020619
Components1

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SHA-2

Top relations

related to External links · 34
SHA-2 → August, Cryptographic Hash Project, CSRC Cryptographic Toolkit, Current, Descriptions, Draft, HKDF, KB, NESSIE, NIST, NISTSHA-2 Checker, Official NIST, One-way Hash Function, PDF, Proposed SHS, RFC, Secure Hash Standard, Secure Hash StandardFIPS PUB, SHA, SHA-0
has application · 17
SHA-2 → ASICs, Debian, DKIM, DNSSEC, International Criminal Tribunal, IPsec, Linux, PGP, Rwandan, S/MIME, SHA-256, SHA-512, SSH, SSL, The, The SHA-2, TLS
related to Official validation · 14
SHA-2 → As, CMVP, Communications Security Establishment, CSE, December, FIPS-approved, For, Implementations, National Institute, NIST, SHA-256, SHA-512, Standards, Technology
related to Hash standard · 12
SHA-2 → April, FIPS PUB, In August, NIST, Secure Hash Standard, SHA, SHA-1, SHA-256, SHA-384, SHA-512, The, With
related to Pseudocode · 5
SHA-2 → Note, Pseudocode, SHA-1, SHA-256, The
related to Implementations · 3
SHA-2 → BotanBouncy CastleCryptlibCrypto, Cryptography, LibgcryptMbed TLSlibsodiumNettleLibreSSLOpenSSLGnuTLSwolfSSL
Certification · 1
SHA-2 → FIPS PUB 180-4, CRYPTREC, NESSIE
Designers · 1
SHA-2 → National Security Agency
Digest sizes · 1
SHA-2 → 224, 256, 384, or 512 bits
First published · 1
SHA-2 → 2001; 25 years ago (2001)

Important terminology Word statistics

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Important terminology

hash sha-512 sha-256 sha-1 nist functions function bits fips use security standard pub algorithms cryptographic initial values sha-3 message different

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
SHA-2CertificationFIPS PUB 180-4, CRYPTREC, NESSIE1.00infobox
SHA-2DesignersNational Security Agency1.00infobox
SHA-2Digest sizes224, 256, 384, or 512 bits1.00infobox
SHA-2First published2001; 25 years ago (2001)1.00infobox
SHA-2Rounds64 or 801.00infobox
SHA-2Series(SHA-0), SHA-1, SHA-2, SHA-31.00infobox
SHA-2StructureMerkle–Damgård construction with Davies–Meyer compression function1.00infobox
SHA-2has applicationThe SHA-20.60section
SHA-2has applicationTLS0.60section
SHA-2has applicationSSL0.60section
SHA-2has applicationPGP0.60section
SHA-2has applicationSSH0.60section

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