| 词条 | HAVAL |
| 释义 |
HAVAL was invented by Yuliang Zheng, Josef Pieprzyk, and Jennifer Seberry in 1992. HAVAL hashesThe HAVAL hashes (also termed fingerprints) are typically represented as 32-, 40-, 48-, 56- or 64-digit hexadecimal numbers. 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 {{Background color|#87CEEB|d}}og", 256, 5) = b89c551cdfe2e06dbd4cea2be1bc7d557416c58ebb4d07cbc94e49f710c55be4Even a small change in the message will (with overwhelming probability) result in a completely different hash, e.g. changing the letter d to a c produces the following hash value: HAVAL("The quick brown fox jumps over the lazy {{Background color|#87CEEB|c}}og", 256, 5) = 60983bb8c8f49ad3bea29899b78cd741f4c96e911bbc272e5550a4f195a4077eThe hash of a zero-length string is: HAVAL("", 256, 5) = be417bb4dd5cfb76c7126f4f8eeb1553a449039307b1a3cd451dbfdc0fbbe330SecurityResearch has uncovered weaknesses which make further use of HAVAL (at least the variant with 128 bits and 3 passes with 26 operations) questionable. On 17 August 2004, collisions for HAVAL (128 bits, 3 passes) were announced by Xiaoyun Wang, Dengguo Feng, Xuejia Lai, and Hongbo Yu.[2] See also
References1. ^{{cite web|url=http://valerieaurora.org/hash.html|title=Lifetimes of cryptographic hash functions}} 2. ^Collisions for Hash Functions MD4, MD5, HAVAL-128 and RIPEMD External links
1 : Cryptographic hash functions |
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