Security protocols employed in practice are used in our everyday life and we heavily depend on their security. The complexity of these protocols still poses a big challenge on their comprehensive analysis. To cope with this complexity, a promising approach is modular security analysis based on universal composability frameworks, such as Canetti's UC model. This appealing approach has, however, only very rarely been applied to the analysis of (existing) real-world protocols. Either the analysis was not fully modular or it could only be applied to idealized variants of the protocols. The main goal of this thesis therefore is to push modular protocol analysis as far as possible, but without giving up on accurate modeling. Our main contributions in a nutshell: An ideal functionality for symmetric key cryptography that provides a solid foundation for faithful, composable cryptographic analysis of real-world security protocols. A computational soundness result of formal analysis for key exchange protocols that use symmetric encryption. Novel universal and joint state composition theorems that are applicable to the analysis of real-world security protocols. Case studies on several security protocols: SSL/TLS, IEEE 802.11i (WPA2), SSH, IPsec, and EAP-PSK. We showed that our new composition theorems can be used for a faithful, modular analysis of these protocols. In addition, we proved composable security properties for two central protocols of the IEEE standard 802.11i, namely the 4-Way Handshake Protocol and the CCM Protocol. This constitutes the first rigorous cryptographic analysis of these protocols. While our applications focus on real-world security protocols, our theorems, models, and techniques should be useful beyond this domain.

This book constitutes the refereed proceedings of the Cryptographers' Track at the RSA Conference 2011, CT-RSA 2011, held in San Francisco, CA, USA, in February 2011. The 24 revised full papers presented together with 1 invited lecture were carefully reviewed and selected from 79 submissions. The papers are organized in topical sections on secure two-party computation, cryptographic primitives, side channel attacks, authenticated key agreement, proofs of security, block ciphers, security notions, public-key encryption, crypto tools and parameters, and digital signatures.

This book constitutes the proceedings of the 6th International Conference on Information Theoretic Security, ICITS 2012, held in Montreal, Canada, in August 2012. The 11 full papers presented in this volume were carefully reviewed and selected from 46 submissions. In addition 11 papers were selected for the workshop track, abstracts of 7 of these contributions are also included in this book. Topics of interest are: physical layer security; multiparty computations; codes, lattices and cryptography; authentication codes; randomness extraction; cryptography from noisy channels; wiretap channels; bounded-storage models; information-theoretic reductions; quantum cryptography; quantum information theory; nonlocality and nonsignaling; key and message rates; secret sharing; physical models and assumptions; network coding security; adversarial channel models; information-theoretic tools in computational settings; implementation challenges; and biometric security.

The three volumes LNCS 10820, 10821, and 10822 constitute the thoroughly refereed proceedings of the 37th Annual International Conference on the Theory and Applications of Cryptographic Techniques, EUROCRYPT 2018, held in Tel Aviv, Israel, in April/May 2018. The 69 full papers presented were carefully reviewed and selected from 294 submissions. The papers are organized into the following topical sections: foundations; lattices; random oracle model; fully homomorphic encryption; permutations; galois counter mode; attribute-based encryption; secret sharing; blockchain; multi-collision resistance; signatures; private simultaneous messages; masking; theoretical multiparty computation; obfuscation; symmetric cryptanalysis; zero-knowledge; implementing multiparty computation; non-interactive zero-knowledge; anonymous communication; isogeny; leakage; key exchange; quantum; non-malleable codes; and provable symmetric cryptography.

This book constitutes the proceedings of the 15th IMA International Conference on Cryptography and Coding, IMACC 2015, held at Oxford, UK, in December 2015. The 18 papers presented together with 1 invited talk were carefully reviewed and selected from 36 submissions. The scope of the conference was on following topics: authentication, symmetric cryptography, 2-party computation, codes, Boolean functions, information theory, and leakage resilience.

This book constitutes the refereed proceedings of the Second International Conference on Provable Security, ProvSec 2008, held in Shanghai, China, October 30 - November 1, 2008. The 25 revised full papers presented were carefully reviewed and selected from 79 submissions. The papers are organized in topical sections on Encryption, Signature, Analysis, Application of Hash Functions, Universal Composability, and Applications.