Original: Distributed.net has brute-forced RC5 messages encrypted with 56- and 64-bit keys, and is working on cracking a 72-bit key; as of August 2009 0.64% of the keyspace have been searched.
Simplified: Distributed.net has brute-forced RC5 messages encrypted with 56- and 64-bit keys, and now is working on cracking a 72-bit key.