| Abstract:
Encryption is one of the foundational tasks of cryptography. The present
schema have been developed under practical necessities; in using
key-indexed families of invertible functions to efficiently conceal and
recover binary information. Of the several encryption models this talk has
special focus on symmetric-key block ciphers. Our example, the Data
Encryption Standard (DES), while dated, is nevertheless of importance and
interest in the design principles of symmetric-key block ciphers.
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