## Huge number factored into primes

Posted by Jonas Elfström Wed, 23 May 2007 05:12:00 GMT

Recently 2^1039-1 were factored. Is this the end of 1024 RSA encryption? Lenstra, one of the researchers, addresses this question: "Last time, it took nine years for us to generalize from a special to a non-special hard-to factor number (155 digits). I won't make predictions, but let's just say it might be a good idea to stay tuned."

2^1039-1 is a special number that the RSA algorithm would never use so 1024 RSA might still be secure for the time being but if you want to be future safe 2048 bits or more would be the way to go.