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[[Category:Solutions by Programming Task]] [[Category:Mathematical operations]] [[Category:String manipulation]]
Tasks in this category have to do with data encryption (or decryption) using various algorithms.
Note that encryption is not the same as a [[:Category:Checksums|checksum]].
With encryption, the derived data carries an encrypted form of the original data, and can be manipulated to recreate the original input.
A checksum is simply a sequence of characters (usually just a few characters in length) that cannot be converted back to the original form (because more than one input can have the same checksum).