This book constitutes the refereed proceedings of the Cryptographers' Track at the RSA Conference 2007, CT-RSA 2007, held in San Francisco, CA, USA in February 2007.

The 25 revised full papers presented together with 2 invited papers were carefully reviewed and selected from 73 submissions. The papers are organized in topical sections on symmetric-key encryption, signatures and authentication, hash functions, digital signatures, cryptographic protocols, side-channel attacks, and efficient implementation.