After various UK government departments lost just about every USB key some new rules were introduced about how they had to be encrypted. Naturally this was hid

After various UK government departments lost just about every USB key some new rules were introduced about how they had to be encrypted. Naturally this was hidden in a procedures manual several 1000 pages long. But because the procedure dealt with encryption of classified data - the procedures manual saying how it had to be protected was of course secret! And couldn't be issued to the workers.