Is anyone working on the current RSA factoring challenge? $10K prize for factoring a 576-bit number; $200K for a 2048-bit number (other awards for 640, 704, 768, 896, 1024 and 1536-bit numbers.) See this page for details: http://www.rsasecurity.com/rsalabs/challenges/factoring/numbers.html They've provided me with the C source used to generate the numbers (though not the BSafe toolkit you need to link into the program.) Anyone can receive the source by asking RSA for it. I've decided to enter by using a factoring program which makes guesses about what the prime number factors are (by examining the last two digits, predicting the likely like of one/both factors, using lists of prime numbers generated by a second algorithm, etc.) So far, barring errors in my logic and code (always a possibility), I've completed a little over 5% of the "likely" candidates for the 576-bit number in a little over 2 days using a single CPU pentium III-600 with 512MB RAM. phillip