Here's a link to the Google Patents page: http://www.google.com/patents/US8396213 http://www.google.com/patents/US8396213 Relevant lines are "Intentional use o

Here's a link to the Google Patents page: http://www.google.com/patents/US8396213 http://www.google.com/patents/US8396213 Relevant lines are "Intentional use of escrow keys can provide for back up functionality. The relationship between P and Q is used as an escrow key and stored by for a security domain. The administrator logs the output of the generator to reconstruct the random number with the escrow key."