Number | Name | Date | Kind |
---|---|---|---|
2995624 | Watters | Aug 1961 | |
4172213 | Barnes et al. | Oct 1979 | |
4471164 | Henry | Sep 1984 | |
4520232 | Wilson | May 1985 | |
4642424 | McNair | Feb 1987 | |
4802217 | Michener | Jan 1989 |
Entry |
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Carl H. Meyer and Stephen M. Matyas, Cryptography: A New Dimension in Computer Data Security, Chapter 2, pp. 53-61, John Wiley & Sons (New York 1982). |