= One-way compression function
{wiki=One-way_compression_function}
A one-way compression function is a type of mathematical function used in cryptography that takes an input (or 'message') and produces a fixed-size output (or 'hash'). The key characteristics of a one-way compression function are: 1. **Irreversibility**: It is computationally infeasible to reverse the function. Given the output, it should be practically impossible to find the original input that produced it. This property is critical for ensuring the security of data.
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