[144296] in cryptography@c2.net mail archive
Fwd: SMS 4 algorithm implemented as a spreasheet.
daemon@ATHENA.MIT.EDU (james hughes)
Wed Feb 25 10:47:33 2009
Cc: james hughes <hughejp@mac.com>
From: james hughes <hughejp@mac.com>
To: Cryptography <cryptography@metzdowd.com>
Date: Wed, 25 Feb 2009 00:19:50 -0800
Building a reference implementation of a cipher can be an invaluable =20=
aid to writing code. Building a cipher in a spreadsheet, while some =20
may suggest is strange, is a valid way to effectively describe a =20
cipher in a visual sense. This has been done before with The =20
Illustrated DES Spreadsheet, it has been done again. With the help of =20=
a Chinese document and an english translation by Whit=EF=AC=81eld Di=EF=AC=
=83e and =20
George Ledin, I was able to create a spreadsheet that demonstrates the =20=
SMS4 algorithm.
This algorithm is rather infamous for being proposed as a WiFi =20
standard. It is has raised it=E2=80=99s head again as being implemented =20=
inside a derivative of the TCG standard TPM module for China under the =20=
name TCM module.
The SMS4 spreadsheet is available in Mac OS X numbers format and .xls =20=
format at
http://tinyurl.com/cfp6w2
Enjoy.
Jim
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