Over on Computerworld, you can find a substantial excerpt from the revised and expanded edition of Privacy on the Line by Whitfield Diffie and Susan Landau. Since the first edition was published in 1998, it's become a standard work on the politics, policy, and law on wiretapping and encryption. Accompanying the excerpt is a podcast of an interview with Whitfield Diffie. Here's a snippet from the interview:
“The reason that we brought out Privacy on the Line in this revised and expanded edition is to reflect this shift in the policy argument – and in particular our concern that if [wiretapping] is applied to internet telephony in the same way that the law now applies it to conventional telephony, it may both stifle innovation and present unprecedented threats to national security…”
Read the excerpt and hear the podcast here.