readme.txt

破解des算法的程序

	EFF DES Cracker Source Code
	===========================

In 1998 the Electronic Frontier Foundation (EFF) [2] built a machine to crack 
DES by exhaustive key search. This machine was used to solve the RSA DES II 
Challenge Contest [3] in less than 3 days. Total cost to design the machine 
was  less than $250.000.

The motivation for this project and the design of the DES Cracker are described
in the book `Cracking DES, Secrets of Encryption Research, Wiretap Politics & 
Chip Design' [1]. 

This book also contains full source code listings that were used in the design.
However, this code was developed in the USA and cryptography export controls 
forbid the export of these documents in electronic form. 

The COSIC research group of the KU Leuven [4] has taken the initiative to scan
in the source code from [1] as given in Chapters 5, 6 and 7. (The EFF had 
encouraged this by publishing these documents in a format that made scanning
`easier'.) For this the PGP OCR tools [5] were used. Thus, the electronic 
versions of the DES Cracker source code are now available  to the 
cryptographic community outside the USA at the URL:
 http://www.esat.kuleuven.ac.be/cosic

Feedback and comments can be sent to [e-mail].


[1] `Cracking DES, Secrets of Encryption Research, Wiretap Politics & Chip
Design', Electronic Frontier Foundation, O'Reilly & Associates, Sebastopol, 
1998.
[2] http://www.eff.org/
[3] http://www.rsa.com/rsalabs/
[4] http://www.esat.kuleuven.ac.be/cosic/ 
[5] http://www.pgpi.com/project/


----------------------------------------------
COSIC research group
Department of Electrical Engineering
Katholieke Universiteit Leuven

URL: http://www.esat.kuleuven.ac.be/cosic
email-contact: [e-mail]

August, 1998.