http://cryptome.org/2014/09/vulcan-cryptanalysis.pdf Vulcan: A Proprietary Cipher of the 1970s
Algorithm Description and Instant Cryptanalysis Cornelius Jenkins Riddler September 2014 Abstract In the 1970s, Motorola developed a proprietary cipher known internally as Vulcan, implemented this cipher in a custom integrated circuit, and marketed a secure communications system based upon Vulcan under the trade name DVP. In this paper we reveal the Vulcan cipher algorithm and develop an eective real-time ciphertext-only cryptanalytic attack against it. We additionally present as much historical information as we have been able to obtain.
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