A key derivation function is an algorithm that generates a cryptographic key from a password or master key. They produce the same result every time for a given input such that it is possible to find the key from a given password. Passwords are potentially too weak to use directly in encryption. Key derivation functions are often used to create a longer and more random key from a password. This is technique is known as key stretching.
Key derivation functions are commonly based on cryptographic hash functions or block ciphers and may make use of salt and pepper.
Type   Definition  An algorithm that produces a key from a password or master key.  Related Concepts  
Encryption
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