If you've ever wondered whether two-factor authentication systems actually boost security, things that spit out random numbers you have to enter in addition to a password, the answer is yes, yes they do. But, their effectiveness is of course dependent on the security of the systems that actually generate those funny numbers, and as of this morning those are looking a little less reliable. RSA, the security division of EMC and producer of the SecurID systems used by countless corporations (and the Department of