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Annotation of researchv10no/games/des/README, revision 1.1.1.1

1.1       root        1: This is a new version of the DES encryption program.  It is eight times
                      2: smaller than the first version, and about 10 percent slower.  One minor
                      3: bug fix was made, but this version is still compatible with the old
                      4: version.
                      5: 
                      6: The old version was based on 8-bit and 12-bit wide look-up tables.  The
                      7: new versions uses 4-bit and 6-bit ones.  In addition, the S and P boxes
                      8: could now be combined, and a number of the look-up tables were either
                      9: all zeros or contained numbers in the range of "unsigned short int".
                     10: All in all, the program became even smaller and much of the lost speed
                     11: was bought back.
                     12: 
                     13: This program runs correctly on the VAX/780.  It should compile on PDP-11
                     14: and 3B-20 computers, but it may not run correctly!  I have not tried it.
                     15: 
                     16: I strongly advise that people bringing this code up do not modify the
                     17: code (like the "numbersoup" or "canofbugs" constants).  Many sites run
                     18: this program, and it would be nice to keep it standard so people can
                     19: exchange encrypted data.

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