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  <algorithm, cryptography> Any procedure used in {cryptography}
  to convert {plaintext} into {ciphertext} in order to prevent
  any but the intended recipient from reading that data.
  There are many types of data encryption, and they are the
  basis of network security.  Common types include {Data
  Encryption Standard} and {public-key encryption}.
  The Unix command crypt performs encryption.


How to create encrypted file systems on Linux:

General cryptography: