This book constitutes the proceedings of the 37th European Conference on IR Research, ECIR 2015, held in Vienna, Austria, in March/April 2015. The 44 full papers, 41 poster papers and 7 demonstrations presented together with 3 keynotes in this volume were carefully reviewed and selected from 305 submissions. The focus of the papers were on following topics: aggregated search and diversity, classification, cross-lingual and discourse, efficiency, evaluation, event mining and summarisation, information extraction, recommender systems, semantic and graph-based models, sentiment and opinion, social media, specific search tasks, temporal models and features, topic and document models, user behavior and reproducible IR.

The two-volume set LNCS 9014 and LNCS 9015 constitutes the refereed proceedings of the 12th International Conference on Theory of Cryptography, TCC 2015, held in Warsaw, Poland in March 2015. The 52 revised full papers presented were carefully reviewed and selected from 137 submissions. The papers are organized in topical sections on foundations, symmetric key, multiparty computation, concurrent and resettable security, non-malleable codes and tampering, privacy amplification, encryption an key exchange, pseudorandom functions and applications, proofs and verifiable computation, differential privacy, functional encryption, obfuscation.

The two-volume set LNCS 10174 and 10175 constitutes the refereed proceedings of the 20th IACR International Conference on the Practice and Theory in Public-Key Cryptography, PKC 2017, held in Amsterdam, The Netherlands, in March 2017. The 34 revised papers presented were carefully reviewed and selected from 160 submissions. They are organized in topical sections such as Cryptanalysis, Protocols, Encrpytion Schemes, Leakage-Resilient and Non-Malleable Codes, Number Theory and Diffie-Hellman, Encryption with Access Control, Special Signatures, Fully Homomorphic Encryption, Real-World Schemes, Multiparty Computation and Primitives.

The two-volume set LNCS 10174 and 10175 constitutes the refereed proceedings of the 20th IACR International Conference on the Practice and Theory in Public-Key Cryptography, PKC 2017, held in Amsterdam, The Netherlands, in March 2017. The 34 revised papers presented were carefully reviewed and selected from 160 submissions. They are organized in topical sections such as Cryptanalysis, Protocols, Encryption Schemes, Leakage-Resilient and Non-Malleable Codes, Number Theory and Diffie-Hellman, Encryption with Access Control, Special Signatures, Fully Homomorphic Encryption, Real-World Schemes, Multiparty Computation and Primitives.

The two-volume set LNCS 9985 and LNCS 9986 constitutes the refereed proceedings of the 14th International Conference on Theory of Cryptography, TCC 2016-B, held in Beijing, China, in November 2016. The total of 45 revised full papers presented in the proceedings were carefully reviewed and selected from 113 submissions. The papers were organized in topical sections named: TCC test-of-time award; foundations; unconditional security; foundations of multi-party protocols; round complexity and efficiency of multi-party computation; differential privacy; delegation and IP; public-key encryption; obfuscation and multilinear maps; attribute-based encryption; functional encryption; secret sharing; new models.