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What is one-way encryption?

One way encryption is a mathematical function that takes a variable-length input string and converts it into a fixed-length binary sequence. Furthermore, one-way encryption, or a one-way hash function, is designed in such a way that it is hard to reverse the process, that is, to find a string that hashes to a given value (hence the name one-way.) A good hash function also makes it hard to find two strings that would produce the same hash value.

Since it is computationally infeasible to produce a document that would hash to a given value or find two documents that hash to the same value, a document’s hash can serve as a cryptographic equivalent of the document.

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