More importantly, perhaps, this can done with a 1.7GHz Pentium M processor -- substantially less power than has been needed in the past. While WEP vulnerabilities were first exposed in 2001, an attack required the accumulation of four million data packets, which took a substantial amount of processing to crack. Subsequent analysis reduced the packets needed, but only now has WEP become critically exposed. The Darmstadt group is recommending the use of two countermeasures: the first is an intrusion detection system, while the second is a cloak of "dummy" WEP keys, which hampers any predictive methods in an attack.