A very positive, technically astute discussion by William Stallings, stallings@acm.org, who concludes: "PGP is young, strong, and coming on. It is already being widely used, and its growth is being fueled by the rapid growth in Internet use and the increasing reliance on E-mail for everything from legal documents to love letters. It is already the practice of many people to include their PGP fingerprint in E-mail messages. Expect to see more of this and to see such fingerprints appearing in print, as one does with this article, in the future.