The RSA Conference, with over 15,000 attendees and 300 exhibitors, is the largest computer security event of the year. The Cryptographers Track (CT- RSA) is a research conference within the RSA Conference. Starting in 2001, CT-RSA continues to its seventh year and is now regarded as one of the major regularly staged event for presenting the results of cryptographic research to a wide variety of audiences. The proceedings of CT-RSA 2007 contain 25 papers selected from 73 s- missions which cover all the topics of cryptography. All the submissions were reviewed by at least three reviewers, which...