The Cryptographers’ Track (CT-RSA) is a research conference within the RSA conference, the largest, regularly staged computer security event. CT-RSA 2004 was the fourth year of the Cryptographers’ Track, and it is now an established venue for presenting practical research results related to cryptography and data security. The conference received 77 submissions, and the program committee sel- ted 28 of these for presentation. The program committee worked very hard to evaluate the papers with respect to quality, originality, and relevance to cryp- graphy. Each paper was reviewed by at least three program committee members. Extended abstracts of the revised versions of these papers are in these proc- dings. The program also included two invited lectures by Dan Boneh and Silvio Micali. I am extremely grateful to the program committee members for their en- mous investment of time and e?ort in the di?cult and delicate process of review and selection. Many of them attended the program committee meeting during the Crypto 2003 conference at the University of California, Santa Barbara.

This book constitutes the refereed proceedings of the Cryptographers' Track at the RSA Conference 2006, CT-RSA 2006, held in San Jose, CA, USA in February 2006. The book presents 24 papers organized in topical sections on attacks on AES, identification, algebra, integrity, public key encryption, signatures, side-channel attacks, CCA encryption, message authentication, block ciphers, and multi-party computation.

This book constitutes the refereed proceedings of the Cryptographers Track at the RSA Conference 2005, CT-RSA 2005, held in San Francisco, CA, USA in February 2005. The 23 revised full papers presented together with 2 invited papers were carefully reviewed and selected from 74 submissions. The papers are organized in topical sections on cryptanalysis, public key encryption, signature schemes, design principles, password-based protocols, pairings, and efficient and secure implementations.

The 2009 RSA conference was held in San Francisco, USA, during April 20-24. The conference is devoted to security-related topics and, as part of this, hosts a distinguished track for cryptographic research. Since 2001 the proceedings of this Cryptographers' Track (CT-RSA) have been published in the series Lecture Notes in Computer Science of Springer. The proceedings of CT-RSA 2009 contain 31 papers selected from 93 s- missions, covering a wide variety of cryptographic areas. Each submission was anonymizedforthereviewingprocessandwasassignedto atleastthreeofthe25 ProgramCommittee members. Submissions co-authoredby committee members were assigned to at least ?ve members. After carefully considering more than 15,000 lines (more than 100,000 words) of reviews and online discussions, the committeeselected31submissionsforacceptance. Theprogramalsoincludedan invited talk by Kenny Paterson entitled “Cryptography and Secure Channels. ” Iwouldliketothankalltheauthorswhosubmittedpapers. Iamalsoindebted to the Program Committee members and all external reviewers for their vol- tary work. The committee's work was tremendously simpli?ed by Shai Halevi's submission software and his support. I would also like to thank the CT-RSA Steering Committee for electing me as Chair, and all the people from the RSA conference team for their support, especially Bree LaBollita.

This book constitutes the refereed proceedings of the Cryptographers' Track at the RSA Conference 2008, CT-RSA 2008, held in San Francisco, CA, USA in April 2008. The 26 revised full papers presented together with the abstract of 1 invited talk were carefully reviewed and selected from 95 submissions. The papers are organized in topical sections on hash function cryptanalysis, cryptographic building blocks, fairness in secure computation, message authentication codes, improved aes implementations, public key encryption with special properties, side channel cryptanalysis, cryptography for limited devices, invited talk, key exchange, cryptanalysis, and cryptographic protocols.

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 two invited papers were carefully reviewed and selected from 73 submissions. The papers are organized in topical sections.