HAVAL is a cryptographic hash function. A cryptographic Hash function is a transformation that takes an input (or 'message' and returns a fixed-size string which is called the hash value (sometimes Unlike MD5, but like most modern cryptographic hash functions, HAVAL can produce hashes of different lengths. In Cryptography, MD5 ( Message-Digest algorithm 5) is a widely used partially insecure Cryptographic hash function with a 128- Bit hash value HAVAL can produce hashes in lengths of 128 bits, 160 bits, 192 bits, 224 bits, and 256 bits. HAVAL also allows users to specify the number of rounds (3, 4, or 5) to be used to generate the hash.
HAVAL was invented by Yuliang Zheng, Josef Pieprzyk, and Jennifer Seberry in 1992. Yuliang Zheng is a Professor at the University of North Carolina at Charlotte. Josef Pieprzyk (born 1949) is a professor at Macquarie University in Sydney, Australia. Jennifer Roma Seberry is a cryptographer mathematician and computer scientist currently a professor at the University of Wollongong, Australia.
HAVAL hashes
The HAVAL hashes (also termed fingerprints) are typically represented as 32-, 40-, 48-, 56- or 64-digit hexadecimal numbers. In Mathematics and Computer science, hexadecimal (also base -, hexa, or hex) is a Numeral system with a The following demonstrates a 43-byte ASCII input and the corresponding HAVAL hash (256 bits, 5 passes):
HAVAL("The quick brown fox jumps over the lazy dog", 256, 5) =
b89c551cdfe2e06dbd4cea2be1bc7d557416c58ebb4d07cbc94e49f710c55be4
Even a small change in the message will (with overwhelming probability) result in a completely different hash, e. American Standard Code for Information Interchange ( ASCII) g. changing the letter d to a c produces the following hash value:
HAVAL("The quick brown fox jumps over the lazy cog", 256, 5) =
60983bb8c8f49ad3bea29899b78cd741f4c96e911bbc272e5550a4f195a4077e
The hash of a zero-length string is:
HAVAL("", 256, 5)
= be417bb4dd5cfb76c7126f4f8eeb1553a449039307b1a3cd451dbfdc0fbbe330
Security
Research has uncovered weaknesses which make further use of HAVAL (at least the variant with 128 bits and 3 passes) questionable. On 17 August 2004, collisions for HAVAL (128 bits, 3 passes) were announced by Xiaoyun Wang, Dengguo Feng, Xuejia Lai, and Hongbo Yu [1]. Events 986 - A Byzantine army was destroyed in the pass of Trajan's Gate by the Bulgarians under the Comitopuli "MMIV" redirects here For the Modest Mouse album see " Baron von Bullshit Rides Again " In Computer science, a hash collision or hash clash is a situation that occurs when two distinct inputs into a Hash function produce identical outputs Wang Xiaoyun ( (born 1966) is a researcher and professor in the Department of Mathematics and System Science Shandong University, Shandong, China
External links
- HAVAL (the official HAVAL page with the research paper on HAVAL, the latest C source code and HAVAL OIDs)
- Online HAVAL calculation with all rounds and lengths
- Another Online HAVAL calculator
- Hash'em all! — text and file hashing with different algorithms (including HAVAL)
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