Herbert S. Zim, author of over 100 children's books, including "Codes and Secret Writing", died at age 85 on December 5th in Plantation Key, Florida, where he has lived for many years. He had Alzheimer's disease. I mention his passing because he wrote the first book I ever read on cryptography, which I read in 4th grade in 1964. If it weren't for Zim, I might not have created PGP. -Philip Zimmermann