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DESCHALL Project
DESCHALL, short for DES Challenge, was the first group to publicly break a message which used the Data Encryption Standard (DES), becoming the $10,000 winner of the first of the set of DES Challenges proposed by RSA Security in 1997. It was established by a group of computer scientists led by Rocke Verser〔(Rocke Verser's home page )〕 assisted by Justin Dolske and Matt Curtin and involved thousands of volunteers who ran software in the background on their own machines, connected by the Internet. They announced their success on June 18, only 96 days after the challenge was announced on January 28.
==Background==
To search the 72 quadrillion possible keys of a 56-bit DES key using conventional computers was considered impractical even in the 1990s. Rocke Verser already had an efficient algorithm that ran on a standard PC〔(Verser's algorithm )〕 and had the idea of involving the spare time on hundreds of other such machines that were connected to the internet. So they set up a server on a 486-based PS/2 PC with 56MB of memory and announced the project via Usenet towards the end of March. Client software was rapidly written for a large variety of home machines and eventually some more powerful 64 bit systems.
There were two other main contenders: SoINET〔(SoINET home page )〕 (a Swedish group), and a group at Silicon Graphics, a manufacturer of high-performance computers, which was in the lead until late in the day. Other groups using supercomputers withdrew after SYN flood attacks on their networks.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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