Distributed File System prof. Giovanni Chiola

Keys and Pass-phrases


Best keys for symmetric encryption should be chosen at random, in order to prevent key-guessing attacks.
Different "session keys" should be used to cipher different files.
Pass-phrases can be converted in good fixed size keys by application of Hash functions.
Session keys can be encrypted using symmetric ciphers by means of hashed pass-phrases.
Encrypted session keys can be stored remotely without comprimising security.
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