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MD5 is an acronym for Message-Digest 5-- a fast and powerful method of increasing security to file transfers and message request transfers.The way it works is the user enters an input string, and the md5 algorithm will generate a 32-character string in hexadecimal characters.Most usages of a hash function for password hashing depend on either preimage resistance, or on other properties (e.g.how well the hash function work when used within HMAC, something which cannot be reduced to any of the properties above).If the hashes match, then you can be confident that the data was sent correctly.There are several useful applications for using an md5 hash generator when interating with other people or machines, including api integration.From the late-1990s some people were saying that MD5 was bad for passwords, but most people "knew" it was good for passwords and this was still what they advised others.
Once a string is hashed into an md5 hash, it cannot be unhashed via any "un-md5" algorithm.I feel that you are really placing the blame on the wrong folks.Anyway, to answer your question about why some folks still recommend MD5: well, gee, it's probably because those folks don't know any better.According to our present knowl- edge, the best recommendations for alternatives to MD5 are SHA-1 and RIPEMD-160.
Even after this study, and all upcoming papers about it's defects, it has been recommended as password hashing function in web applications, ever since.People who "recommend MD5" for password hashing just don't know any better, and they are a testament to a Truth which you should always keep in mind: not everything you find on the Internet is correct and trustworthy. Or, to be a bit more serious: cryptographers already recommend that new systems should avoid MD5, and they recommend that existing systems should migrate away from MD5.