"When stopping a terrorist attack or seeking to recover a kidnapped child, encountering encryption may mean the difference between success and catastrophic failures"
-- Janet Reno, Sept 99
"gentlemen do not read each others mail"
-- Henry Lewis Stimson
Cryptography is a skill, described in Basic Set, p. 186. It is mentioned in relation to tools that assist in its use in GURPS High Tech on page 210 and GURPS Ultra Tech on page 47. It is part of the Secret Agent Template from GURPS Space, on page 232. It is listed under the Mathematical Ability, Born to be Wired, and Evil Computer Talents on page 12 in GURPS Power-Ups 3: Talents.