RAND has put on it Web site eleven "classics" on distributed communications, most of them by Paul Baran. They offer good background to current debate on secrecy, security and cryptography. Here are the contents of No. 9 on security. http://www.rand.org/publications/RM/RM3765/ Memorandum RM-3765-PR August 1964 On Distributed Communications: IX Security, Secrecy, and Tamper-Free Considerations Paul Baran Contents, Preface, Summary, Foreword I. Introduction II. The Paradox of the Secrecy About Secrecy The Assumption of a Clear Dichotomy Between Classified and Unclassified Subject Matter Cost and Result of Present-Day Cryptographic Equipment On Secrecy of Secrecy III. Some Fundamentals of Cryptography Digital Transmission Layers of Encryption IV. Implications for the Distributed Network System Link-by-Link Cryptography in the Distributed Network End-to-End Cryptography in the Distributed Network Genealogy of the Keys Generation and Distribution of Keys Protection Offered by Semi-Random Path Choice V. A "Devil's Advocate" Examination Appendix Use of a Function of N-Boolean Variables as a Second-Order Modifier for "Next-Key" Generation