Fwd: SMS 4 algorithm implemented as a spreasheet.

[james hughes]

Building a reference implementation of a cipher  can be an invaluable  
aid to writing code. Building a cipher in a spreadsheet, while some  
may suggest is strange, is a valid way to effectively describe a  
cipher in a visual sense. This has been done before with The  
Illustrated DES Spreadsheet, it has been done again. With the help of  
a Chinese document and an english translation by Whitfield Diffie and  
George Ledin, I was able to create a spreadsheet that demonstrates the  
SMS4 algorithm.

This algorithm is rather infamous for being proposed as a WiFi  
standard. It is has raised it’s head again as being implemented  
inside a derivative of the TCG standard TPM module for China under the  
name TCM module.

The SMS4 spreadsheet is available in Mac OS X numbers format and .xls  
format at
	http://tinyurl.com/cfp6w2

Enjoy.

Jim



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