X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;ds=sidebyside;f=7.1%2Fr%2Fenable%2Fchecksum.doc;fp=7.1%2Fr%2Fenable%2Fchecksum.doc;h=0000000000000000000000000000000000000000;hb=b13ea8a082364672c6de2b010e558211ff52ec9a;hp=e4edef5c459bb266b5cb1ad854a4ee7ad40f6679;hpb=01534a94130c1f5a3a230cf4fe18365a235ba271;p=deb_pkgs%2Fscowl.git

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-                        THE "CHECKSUM" PROGRAM
-ÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜ
-
-A "checksum" is a uniquely generated file signature, a sort of digital
-certificate of authenticity for that file. It is a number calculated
-from the very contents of the file. Changing a single character in the
-file results in a different checksum. This makes it easy to determine
-whether a file has been tampered with or altered.
-
-A generic checksum utility might work by assigning each character (letter)
-in the tested file a numerical value according to its relative position in
-the alphabet. If we were to give 'a' a value of 1, then 'b' would be 2,
-'c' would be 3... and finally 'z' would become 26. Finding the sum of
-all the numbers associated with the characters in a word file would
-yield a ridiculously large number, so, at periodic intervals, one could
-divide the running total by a cleverly chosen "magic number" and only
-keep the remainder. Throw in an additional factor to distinguish adjacent
-characters from one another, so that a transposition of letters makes a
-difference in the final total. To increase security, output the checksum
-in hexadecimal, or base 16 notation, so that the letters 'a' through
-'f' stand for the decimal numbers 10 through 15.  Simple, yet effective.
-
-For all you technical types, this is nothing more than a simple "hashing"
-algorithm, nevertheless, it serves its purpose by detecting most instances
-of tampering and alteration in files
-
-The first release of ENABLE used a checksum utility written by one
-of the maintainers of that list. That particular checksum program
-had a clever hack to return the same checksum for both the DOS and
-UNIX versions of an otherwise identical list. In the interests of
-increased security, the original checksum program will no longer be
-distributed with ENABLE. Users of the ENABLE list wishing to verify
-that their copy of the list is pristine are now urged to download the
-"MD5 Command Line Message Digest Utility", written by Ron Rivest
-(of RSA fame) from http://www.fourmilab.ch/md5/. The "md5.zip"
-file from that site contains both a 32-bit Windows binary and the
-source code for a UNIX build. The md5 signature for the WORD.LST
-file in ENABLE2K is B175518814B6B8787CFE34C7BB8705B6 (if the file is
-converted to UNIX format, with the CR's removed, the md5 signature is
-E942E9E884090D2BDB02265864882231).  The maintainers of the ENABLE list
-regret that they can offer no assistance in using "md5".
-
-Those interesting in delving more deeply into the subject of file security
-may obtain Phil Zimmerman's "PGP" program. It is considerably more secure,
-if more complex, than even the excellent md5 package. The excellent book,
-PGP: PRETTY GOOD PRIVACY, by Simon Garfinkel (O'Reilly & Associates,
-Inc., ISBN 1-56592-098-8), gives in depth coverage on the subject.
-
-
-                                 M\Cooper
-                                PO Box 237
-                       St. David, AZ  85630-0237
-                        thegrendel@theriver.com
-               http://personal.riverusers.com/~thegrendel/