home *** CD-ROM | disk | FTP | other *** search
- Public-domain DES commands, library and utilities by Phil Karn, KA9Q
- This file last updated 5 Dec 1988
-
- The makefile compiles everything and runs test data (from the NBS
- certification suite) through DES. Everything runs as-is on a big-endian
- machine running UNIX. For little-endian machines like the VAX,
- uncomment the definition of LITTLE_ENDIAN in the makefile. If you get
- the byte order wrong, the test output in "certify" will say "ENCRYPT
- FAIL" instead of "OK"; just change the flag and recompile. For MS-DOS
- and Aztec C, use makefile.pc; note that the Intel 8086 family is
- little-endian so this is the default.
-
- The des executable (source in main.c) is a encrypt/decrypt filter
- compatible with Sun's des command, but somewhat faster. Included are
- uuencode/uudecode utilities for encoding and decoding the binary
- ciphertext from des into printable ASCII for secure transmission through
- mail systems.
-
- Radlogin is an experimental program for secure login over insecure
- channels (like packet radio). It runs under Berkeley UNIX only. Make
- it the shell for a special, password-free login (e.g., "radio"). When
- it starts the user will be asked his REAL login name, which is then
- looked up in /etc/rkeys. (This file must be protected since it contains
- DES keys). The time of day is then printed in hex as a challenge, and
- the user must encrypt it using DES and his key and type the answer back.
- The user uses the program "descalc" to perform his local calculation.
- All this is very clumsy; at a minimum it requires Doubledos (net.exe in
- one partition, descalc in the other) and manual retyping of the
- challenge in plain and ciphertext form. Ideally this should be part of
- net.exe, invoked perhaps by a special telnet option after the user's
- name is entered. If the client telnet refuses the option, it sends an
- ordinary password prompt; otherwise it does the authentication and
- bypasses the password.
-
- The format of /etc/rkeys is as follows:
-
- user_name<sp>DES_key_in_hex
- karn 0123456789abcdef
- n4hy fedcba987654321
-
- This is all experimental, of course; improvements are most welcome.
-
- Phil
-