joe shoemaker wrote:
I would like to convert url into md5 hash. My question is that md5
hash will create collision at 2^64. If you do long(value,16), where
value is the md5 hash string, would value returned from long(value,
16) be unique as long as md5 hashed string is unique? when you move
md5 hashed string to long, where will the collision occur, at anything
MD5's are not meant to be unique keys. They are designed to make it
difficult to alter the original value and maintain the same hash. This
prevents both errors and malevolent data tampering.
Also note, I believe MD5 are typically 128 bits long, not 64, but the
calculation for collision is more complicated than that.
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