![]() In Swift, for instance, many data types are hashable, making hashes available for such purposes.Ī common form of checksum is the Cyclical Redundancy Check, CRC-32, which is used to generate a 32-bit number as a check of the integrity of a file which is transmitted. For example, when comparing two text strings to see if they’re the same, it’s often far quicker to compare their hashes rather than step through comparing every character in the strings. One significant factor in the likelihood of collisions is that all different values of the checksum/hash must be of approximately equal probability.īasic non-cryptographic hashes are widely used throughout computing. A single byte could be very quick to calculate and economical on storage, but with only 256 different values, collisions would be too common for it to be of any practical use. When two different chunks of data result in the same checksum or hash, that’s known as a collision, and is every bit as bad as that sounds.Ĭlearly, the longer the checksum, the lower the risk of collisions. ![]() To do this, checksums and hashes must be quick to calculate, and checksums for different data must be different.
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