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The sup programs can be built with or without crypting functionality.
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If the file netcryptvoid.c is used no crypting code will be used.
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If the file netcrypt.c is used, an engima engine crypting scheme
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taken from the BSD 4.3 (1/25/85) file /usr/bin/crypt.c will be used. Since,
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this code is both licensed and under U.S. foreign trade restrictions,
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we cannot make this code available for anonymous FTP.
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If you want to build a sup client which can encrypt data and you
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are a domestic site who has a 4.3 BSD license, we can mail you
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a copy of then netcrypt.c file. Just send mail to mach@cs.cmu.edu
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If you have a crypt.c file available, copy it to the directory
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./crypt and the makefile file apply the diff in crypt.diffs to
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generate the netcrypt.c file.