Using Content-Addressable Search Engines to Encrypt and Break DES: A very simple parallel architecture using a modifed version of content-addressable memory can be used to cheaply and efficiently encipher and decipher data with DES-like systems Describes how to implement these systems, and also how to construct a large scale engine for exhaustively searching the keyspace of DES.
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Source: https://packetstormsecurity.com/files/16120/desbreak.ps.html