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RIPEMD algorithm
== MD5 ==
== MD5 ==
MD5 became a computing standard <ref>http://tools.ietf.org/html/rfc1321</ref> for hashing but was subsequently found to be insecure<ref>http://merlot.usc.edu/csac-f06/papers/Wang05a.pdf</ref> and was replaced with SHA1. MD5 breaks the input up into 512-bit blocks and churns it down into a 128-bit bit hash. For example, the text "The quick brown fox jumps over the lazy dog" would become (base64 encoded):
MD5 became a computing standard <ref>http://tools.ietf.org/html/rfc1321</ref> for hashing but was subsequently found to be insecure<ref>http://merlot.usc.edu/csac-f06/papers/Wang05a.pdf</ref> and was replaced with SHA1. MD5 breaks the input up into 512-bit blocks and churns it down into a 128-bit bit hash. For example, the text "The quick brown fox jumps over the lazy dog" would become (base64 encoded):
<code>50842ef1bd9a95a284b395a0f0e0e2f8</code>
<code>50842ef1bd9a95a284b395a0f0e0e2f8</code><br />
MD5 was intended to solve a weakness in MD4, although both were actually published as open standards at the same time. For this reason, MD4 was never largely implemented and MD5 became the algorithm of choice.
== RIPEMD ==
RIPEMD (Race Integrity Primitives Evaluation Message Digest)<ref>"RIPEMD." TheFreeDictionary.com. 2019. Farlex, Inc. 15 May. 2019 https://acronyms.thefreedictionary.com/RIPEMD</ref> was released in 1992, and based on MD4. This original RIPEMD-128 ran two instances of the MD4 algorithm in parallel. It was therefore less efficient than MD5, and not entirely trusted by many, since MD4 had a weakness which had been known since its public release. A hash collision was found with PIREMD in 2004, and the industry stopped using it. However, RIPEMD-160 (the most popular), RIPEMD-256, are RIPEMD-320 are strengthened (utilizing larger keys) versions of this algorithm which were released in 1996 and are still in use today.
== SHA-1 ==
== SHA-1 ==