Coding and Applications -- Recent Developments in Array Error-Control Codes -- High Rate Convolutional Codes with Optimal Cycle Weights -- A Multifunctional Turbo-Based Receiver Using Partial Unit Memory Codes -- Commitment Capacity of Discrete Memoryless Channels -- Separating and Intersecting Properties of BCH and Kasami Codes -- Applications of Coding in Cryptography -- Analysis and Design of Modern Stream Ciphers -- Improved Fast Correlation Attack Using Low Rate Codes -- On the Covering Radius of Second Order Binary Reed-Muller Code in the Set of Resilient Boolean Functions -- Degree Optimized Resilient Boolean Functions from Maiorana-McFarland Class -- Differential Uniformity for Arrays -- Cryptography -- Uses and Abuses of Cryptography -- A Designer’s Guide to KEMs -- A General Construction of IND-CCA2 Secure Public Key Encryption -- Efficient Key Updating Signature Schemes Based on IBS -- Periodic Sequences with Maximal Linear Complexity and Almost Maximal k-Error Linear Complexity -- Cryptanalysis -- Estimates for Discrete Logarithm Computations in Finite Fields of Small Characteristic -- Resolving Large Prime(s) Variants for Discrete Logarithm Computation -- Computing the M = UU t Integer Matrix Decomposition -- Cryptanalysis of the Public Key Cryptosystem Based on the Word Problem on the Grigorchuk Groups -- More Detail for a Combined Timing and Power Attack against Implementations of RSA -- Predicting the Inversive Generator -- A Stochastical Model and Its Analysis for a Physical Random Number Generator Presented At CHES 2002 -- Analysis of Double Block Length Hash Functions -- Network Security and Protocols -- Cryptography in Wireless Standards -- On the Correctness of Security Proofs for the 3GPP Confidentiality and Integrity Algorithms -- A General Attack Model on Hash-Based Client Puzzles -- Tripartite Authenticated Key Agreement Protocols from Pairings -- Remote User Authentication Using Public Information -- Mental Poker Revisited.

The ninth in the series of IMA Conferences on Cryptography and Coding was held (as ever) at the Royal Agricultural College, Cirencester, from 16–18 Dec- ber 2003. The conference’s varied programme of 4 invited and 25 contributed papers is represented in this volume. The contributed papers were selected from the 49 submissions using a - reful refereeing process. The contributed and invited papers are grouped into 5 topics: coding and applications; applications of coding in cryptography; cryp- graphy; cryptanalysis; and network security and protocols. These topic headings represent the breadth of activity in the areas of coding, cryptography and c- munications, and the rich interplay between these areas. Assemblingtheconferenceprogrammeandthisproceedingsrequiredthehelp of many individuals. I would like to record my appreciation of them here. Firstly, I would like to thank the programme committee who aided me - mensely by evaluating the submissions, providing detailed written feedback for the authors of many of the papers, and advising me at many critical points - ring the process. Their help and cooperation was essential, especially in view of the short amount of time available to conduct the reviewing task. The c- mittee this year consisted of Mike Darnell, Mick Ganley, Bahram Honary, Chris Mitchell, Matthew Parker, Nigel Smart and Mike Walker.