This volume continues the tradition established in 2001 of publishing the c- tributions presented at the Cryptographers’ Track (CT-RSA) of the yearly RSA Security Conference in Springer-Verlag’s Lecture Notes in Computer Science series. With 14 parallel tracks and many thousands of participants, the RSA - curity Conference is the largest e-security and cryptography conference. In this setting, the Cryptographers’ Track presents the latest scienti?c developments. The program committee considered 49 papers and selected 20 for presen- tion. One paper was withdrawn by the authors. The program also included two invited talks by Ron Rivest (“Micropayments Revisited” – joint work with Silvio Micali) and by Victor Shoup (“The Bumpy Road from Cryptographic Theory to Practice”). Each paper was reviewed by at least three program committee members; paperswrittenbyprogramcommitteemembersreceivedsixreviews.Theauthors of accepted papers made a substantial e?ort to take into account the comments intheversionsubmittedtotheseproceedings.Inalimitednumberofcases,these revisions were checked by members of the program committee. I would like to thank the 20 members of the program committee who helped to maintain the rigorous scienti?c standards to which the Cryptographers’ Track aims to adhere. They wrote thoughtful reviews and contributed to long disc- sions; more than 400 Kbyte of comments were accumulated. Many of them - tended the program committee meeting, while they could have been enjoying the sunny beaches of Santa Barbara.

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 2003, CT-RSA 2003, held in San Francisco, CA, USA, in April 2003. The 26 revised full papers presented together with abstracts of 2 invited talks were carefully reviewed and selected from 97 submissions. The papers are organized in topical sections on key self-protection, message authentication, digital signatures, pairing based cryptography, multivariate and lattice problems, cryptographic architectures, new RSA-based cryptosystems, chosen-ciphertext security, broadcast encryption and PRF sharing, authentication structures, elliptic curves and pairings, threshold cryptography, and implementation issues.

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.

This book constitutes the refereed proceedings of the Cryptographers' Track at the RSA Conference 2012, CT-RSA 2012, held in San Francisco, CA, USA, in February/March 2012. The 26 revised full papers presented were carefully reviewed and selected from 113 submissions. The papers are organized in topical sections on side channel attacks, digital signatures, public-key encryption, cryptographic protocols, secure implementation methods, symmetric key primitives, and secure multiparty computation.

This book constitutes the refereed proceedings of the Cryptographers' Track at the RSA Conference 2009, CT-RSA 2009, held in San Francisco, CA, USA in April 2009. The 31 revised full papers presented were carefully reviewed and selected from 93 submissions. The papers are organized in topical sections on identity-based encryption, protocol analysis, two-party protocols, more than signatures, collisions for hash functions, cryptanalysis, alternative encryption, privacy and anonymity, efficiency improvements, multi-party protocols, security of encryption schemes as well as countermeasures and faults.