The 13th IMA Conference on Cryptography and Coding was held at the Lady Margaret Hall, University of Oxford, UK, during December 12–15, 2011. This event was a 25th anniversary celebration of the very successful biennial IMA conference series. Traditionally, the conference has taken place at the Royal Agricultural College, Cirencester, UK. Despite the change of venue, we managed to maintain both the style and atmosphere of the previous 12 events at this lovely location.

The conference programme consisted of four invited talks and 27 contributed papers. Special thanks to the invited speakers, namely, Ivan Damg?ard (Aarhus University, Denmark), Paddy Farrell (Lancaster University and University of Kent, UK), Jonathan Jedwab (Simon Fraser University, Canada) and David Naccache (ENS, France), who gave very enlightening talks. David Naccache also very kindly provided a paper, included in the proceedings.

Out of 57 submissions from 22 countries, 27 papers were selected, presented at the conference, and included in the proceedings. The accepted papers cover a wide range of topics in the field of mathematics and computer science, including coding theory, homomorphic encryption, symmetric and public key cryptosystem, cryptographic functions and protocols, efficient pairing and scalar multiplication implementation, knowledge proof, and security analysis.

The success of this event would be impossible without the help and hard work of so many people. Many thanks are due. First, I would like to thank the Steering Committee for their guidance on the general format of the conference. I also heartily thank the Programme Committee and the sub-reviewers, listed on the following pages, for their careful and thorough reviews. Each paper was reviewed by at least three people, most by four. Significant time was spent discussing the papers. Thanks must also go to the hard-working shepherds for their guidance and helpful advice on improving a number of papers.

The authors of all submitted papers must be thanked. I acknowledge the authors of accepted papers for revising papers according to referee suggestions and for returning latex source files in good time. The revised versions were not checked by the Programme Committee so authors bear full responsibility for their contents.

Thank you to the staff at Springer for their help with producing the proceedings. Thanks also to the developers and maintainers of EasyChair software, by which the submission and review process was greatly simplified.

On behalf of the conference organization and participants, I would like to express our appreciation to Cryptomathic, Hewlett-Packard and Vodafone for their generous sponsorship of this event. I would like to give special thanks to Cryptomathic for sharing their 25th anniversary with us.