Message Digester, also known as a cryptographic hash function or simply a hash function, is a mathematical algorithm that takes an input (or 'message') and returns a fixed-size string of characters, which is usually a hexadecimal number. The same input will always produce the same output, but even a small change to the input will produce a very different output.
The main goal of message digester is to provide a way to ensure the integrity and authenticity of the message, by comparing the generated hash of the original message with the hash of the received message. If the two are the same, then the message has not been tampered with during transmission.
Some of the widely used message digester algorithms are:
- SHA (Secure Hash Algorithm)
- MD5 (Message-Digest Algorithm 5)
- BLAKE2
- SHA3
It's also worth noting that hash functions are used in other areas such as digital signature and password storage.
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