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MD5 information


MD5
General
DesignersRonald Rivest
First publishedApril 1992
SeriesMD2, MD4, MD5, MD6
Cipher detail
Digest sizes128 bit
Block sizes512 bit
StructureMerkle–Damgård construction
Rounds4[1]
Best public cryptanalysis
A 2013 attack by Xie Tao, Fanbao Liu, and Dengguo Feng breaks MD5 collision resistance in 218 time. This attack runs in less than a second on a regular computer.[2] MD5 is prone to length extension attacks.

The MD5 message-digest algorithm is a widely used hash function producing a 128-bit hash value. MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function MD4,[3] and was specified in 1992 as RFC 1321.

MD5 can be used as a checksum to verify data integrity against unintentional corruption. Historically it was widely used as a cryptographic hash function; however it has been found to suffer from extensive vulnerabilities. It remains suitable for other non-cryptographic purposes, for example for determining the partition for a particular key in a partitioned database, and may be preferred due to lower computational requirements than more recent Secure Hash Algorithms.[4]

  1. ^ Rivest, R. (April 1992). "Step 4. Process Message in 16-Word Blocks". The MD5 Message-Digest Algorithm. IETF. p. 5. sec. 3.4. doi:10.17487/RFC1321. RFC 1321. Retrieved 10 October 2018.
  2. ^ Xie Tao; Fanbao Liu; Dengguo Feng (2013). "Fast Collision Attack on MD5" (PDF). Cryptology ePrint Archive.
  3. ^ Ciampa, Mark (2009). CompTIA Security+ 2008 in depth. Australia; United States: Course Technology/Cengage Learning. p. 290. ISBN 978-1-59863-913-1.
  4. ^ Kleppmann, Martin (2 April 2017). Designing Data-Intensive Applications: The Big Ideas Behind Reliable, Scalable, and Maintainable Systems (1 ed.). O'Reilly Media. p. 203. ISBN 978-1449373320.

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MD5

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summarize security considerations in MD5 and HMAC-MD5. For HMAC-MD5 the RFC summarizes that – although the security of the MD5 hash function itself is severely...

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of string variables): HA1 = MD5(username:realm:password) HA2 = MD5(method:digestURI) response = MD5(HA1:nonce:HA2) An MD5 hash is a 16-byte value. The...

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Cryptographic hash function

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attacker to find two messages with the same MD5 hash, then they can find as many additional messages with that same MD5 hash as they desire, with no greater...

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Md5sum

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computer program that calculates and verifies 128-bit MD5 hashes, as described in RFC 1321. The MD5 hash functions as a compact digital fingerprint of a...

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National Security Innovation Network

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The National Security Innovation Network (previously named the MD5 National Security Technology Accelerator) is a United States Department of Defense...

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Secure Hash Algorithms

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version SHA-1. SHA-1: A 160-bit hash function which resembles the earlier MD5 algorithm. This was designed by the National Security Agency (NSA) to be...

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Magnet URI scheme

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(Hex) ] Message Digest 5 (MD5) Supported by G2 (Gnutella2), such hashes are vulnerable to hash collision attacks. xt=urn:md5:[ MD5 Hash (Hex) ] There are...

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Rainbow table

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are specific to the hash function they were created for e.g., MD5 tables can crack only MD5 hashes. The theory of this technique was invented by Philippe...

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Bacula

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SMB, etc.; this eases firewall administration and network security CRAM-MD5 – configurable client–server authentication GZIP/LZO – client-side compression...

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Collision attack

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attacks against two very commonly used hash functions, MD5 and SHA-1. The collision attacks against MD5 have improved so much that, as of 2007, it takes just...

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Simple Authentication and Security Layer

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layer offering data integrity and data confidentiality services. DIGEST-MD5 provides an example of mechanisms which can provide a data-security layer...

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Hash collision

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specific collisions. Take into account the following hash algorithms – CRC-32, MD5, and SHA-1. These are common hash algorithms with varying levels of collision...

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RADIUS

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present, it is hidden using a method based on the RSA Message Digest Algorithm MD5. Accounting is described in RFC 2866. When network access is granted to the...

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Extensible Authentication Protocol

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about 40 different methods defined. Methods defined in IETF RFCs include EAP-MD5, EAP-POTP, EAP-GTC, EAP-TLS, EAP-IKEv2, EAP-SIM, EAP-AKA, and EAP-AKA'. Additionally...

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SMTP Authentication

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older SASL mechanism for ESMTP authentication (ESMTPA) is CRAM-MD5, and uses of the MD5 algorithm in HMACs (hash-based message authentication codes) are...

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TACACS

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clear-text, but the body including passwords is obfuscated with an MD5-based method. The MD5-based obfuscation method is similar to that used for the RADIUS...

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MD4

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length is 128 bits. The algorithm has influenced later designs, such as the MD5, SHA-1 and RIPEMD algorithms. The initialism "MD" stands for "Message Digest"...

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Salted Challenge Response Authentication Mechanism

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Alice sends a hashed version of her password instead, like in CRAM-MD5 or DIGEST-MD5. As it is a hash, Mallory doesn't get the password itself. And because...

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Fdupes

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pointing to the duplicate. It first compares file sizes, partial MD5 signatures, full MD5 signatures, and then performs a byte-by-byte comparison for verification...

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Hashcat

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Windows. Examples of hashcat-supported hashing algorithms are LM hashes, MD4, MD5, SHA-family and Unix Crypt formats as well as algorithms used in MySQL and...

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NTLM

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CC2, domain name) v2-Hash = HMAC-MD5(NT-Hash, user name, domain name) LMv2 = HMAC-MD5(v2-Hash, SC, CC) NTv2 = HMAC-MD5(v2-Hash, SC, CC*) response = LMv2...

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Comparison of mail servers

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September 1, 2014. Retrieved February 25, 2022. CRAM-MD5 to Historic, 20 November 2008. Moving DIGEST-MD5 to Historic, July 2011. "DovecotFeatures - Dovecot...

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Cryptography

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series of MD5-like hash functions: SHA-0 was a flawed algorithm that the agency withdrew; SHA-1 is widely deployed and more secure than MD5, but cryptanalysts...

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Gravatar

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Gravatars are loaded from the Gravatar web server, using a URL containing an MD5 hash of the associated email address. This method has, however, been shown...

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