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Cryptography Essentials
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Hashing and Digital Signatures
- Hashing: A one-way function that converts data into a fixed-size string of characters (the hash). You cannot reverse it to get the original data. It is used to verify Integrity. If even one bit of the file changes, the hash changes completely.
- Digital Signatures: A mathematical scheme for demonstrating the authenticity of a digital message or document. It uses asymmetric cryptography to prove that a message came from a specific sender and has not been altered.