🚀 go-pugleaf

-----BEGIN PGP SIGNED MESSAGE-----

In <4aj5d1$r5v@nntp.igs.net>, curryk@cnwl.igs.net (Kevin Curry) writes:
>Hello,
>
>	All this time using computers and I never really asked. Hummm!!!!
>
>What is Checksum, Cyclic Redundancy Check and a MD5 Hash Function?

A Checksum is simply the sum of all the bytes (or 'words' or 'longs') in a 
message/record/whathaveyou.  It may or may not be truncated back to a 
byte/word/long.  Its advantage is it's fast.  Disadvantage is that there are 
some common errors it doesn't find.

CRC is the remainder after logically dividing (use XOR instead of subtract) a 
message/record/whathaveyou by a 'polynomial'.  A well chosen polynomial finds 
most common transmission errors.  CRC16 has a polynomial of:
x^16 + x^15 + x^2 + 1
when doing the divide, you'll be left with a remainder which fits into 16 bits.
if this is then appended to the original message, the reciver simply does the 
divide over the entire datastream and gets 0 as the remainder.

MD5 - damifino... I haven't worked with it, nor read anything about it


Victor A. Wagner, Jr.                Key fingerprint =  4D 20 EB F6 01 01 B0 69
CFO Metadigm, Inc.                                      38 17 8D BF C8 46 E4 7A
Vice-Chair Orange County (CA) Libertarian Party           http://www.lp.org/lp/
The five most dangerous words in the English language: "There oughtta be a law"

-----BEGIN PGP SIGNATURE-----
Version: 2.6.2

iQB1AwUBMM1G1pO57AuaJdhFAQFxLAL/bkYIjGteIxJoh0XdsfTj5lzUIKNqFQVf
IAI2k8crOqnG1/P/1dfbd9RXrIgQuOEsrEdDcFqkDlB+uOxRGVStSZ8cpjnRQeMI
1nzbMoW7fmTuV1dCaqtvNfwMK133FyDV
=443G
-----END PGP SIGNATURE-----