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  2. Hash collision - Wikipedia

    en.wikipedia.org/wiki/Hash_collision

    John Smith and Sandra Dee share the same hash value of 02, causing a hash collision. In computer science, a hash collision or hash clash [1] is when two distinct pieces of data in a hash table share the same hash value. The hash value in this case is derived from a hash function which takes a data input and returns a fixed length of bits. [2]

  3. Collision attack - Wikipedia

    en.wikipedia.org/wiki/Collision_attack

    The collision attacks against MD5 have improved so much that, as of 2007, it takes just a few seconds on a regular computer. [2] Hash collisions created this way are usually constant length and largely unstructured, so cannot directly be applied to attack widespread document formats or protocols.

  4. MD5 - Wikipedia

    en.wikipedia.org/wiki/MD5

    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.

  5. HashClash - Wikipedia

    en.wikipedia.org/wiki/HashClash

    HashClash was a volunteer computing project running on the Berkeley Open Infrastructure for Network Computing (BOINC) software platform to find collisions in the MD5 hash algorithm. [1] It was based at Department of Mathematics and Computer Science at the Eindhoven University of Technology , and Marc Stevens initiated the project as part of his ...

  6. Cryptographic hash function - Wikipedia

    en.wikipedia.org/wiki/Cryptographic_hash_function

    MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function, MD4, and was specified in 1992 as RFC 1321. Collisions against MD5 can be calculated within seconds, which makes the algorithm unsuitable for most use cases where a cryptographic hash is required. MD5 produces a digest of 128 bits (16 bytes).

  7. Collision resistance - Wikipedia

    en.wikipedia.org/wiki/Collision_resistance

    Cryptographic hash functions are usually designed to be collision resistant. However, many hash functions that were once thought to be collision resistant were later broken. MD5 and SHA-1 in particular both have published techniques more efficient than brute force for finding collisions.

  8. Marc Stevens (cryptology) - Wikipedia

    en.wikipedia.org/wiki/Marc_Stevens_(Cryptology)

    Dr. ir. Marc Stevens is a cryptology researcher most known for his work on cryptographic hash collisions and for the creation of the chosen-prefix hash collision tool HashClash as part of his master's degree thesis. [2]

  9. Digest access authentication - Wikipedia

    en.wikipedia.org/wiki/Digest_access_authentication

    An MD5 hash is a 16-byte value. The HA1 and HA2 values used in the computation of the response are the hexadecimal representation (in lowercase) of the MD5 hashes respectively. RFC 2069 was later replaced by RFC 2617 (HTTP Authentication: Basic and Digest Access Authentication).