The two-volume proceedings LNCS 9056 + 9057 constitutes the proceedings of the 34th Annual International Conference on the Theory and Applications of Cryptographic Techniques, EUROCRYPT 2015, held in Sofia, Bulgaria, in April 2015.

Cryptanalysis of the Multilinear Map over the Integers.- Robust Authenticated-Encryption AEZ and the Problem That It Solves.- On the Behaviors of Affine Equivalent Sboxes Regarding Differential and Linear Attacks.- A Provable-Security Analysis of Intel's Secure Key RNG.- A Formal Treatment of Backdoored Pseudorandom Generators.- Improving NFS for the Discrete Logarithm Problem in Non-prime Finite Fields.- The Multiple Number Field Sieve with Conjugation and Generalized.- Better Algorithms for LWE and LWR.- On Computing Nearest Neighbors with Applications to Decoding of Binary Linear Codes.- Cryptanalytic Time-Memory-Data Tradeoffs for FX-Constructions with Applications to PRINCE and PRIDE.- A Generic Approach to Invariant Subspace Attacks: Cryptanalysis of Robin, iSCREAM and Zorro.- Structural Evaluation by Generalized Integral Property.- Cryptanalysis of SP Networks with Partial Non-Linear Layers.- The Sum Can Be Weaker Than Each Part.- SPHINCS: Practical Stateless Hash-Based Signatures.- Making Masking Security Proofs Concrete: Or How to Evaluate the Security of Any Leaking Device.- Ciphers for MPC and FHE.- Verified Proofs of Higher-Order Masking.- Inner Product Masking Revisited.- Fully Homomophic Encryption over the Integers Revisited.- (Batch) Fully Homomorphic Encryption over Integers for Non-Binary Message Spaces .- KDM-CCA Security from RKA Secure Authenticated Encryption.- On the Provable Security of the Iterated Even-Mansour Cipher Against Related-Key and Chosen-Key Attacks.- FHEW: Bootstrapping Homomorphic Encryption in Less Than a Second.- Bootstrapping for HElib.- More Efficient Oblivious Transfer Extensions with Security for Malicious Adversaries.- How to Efficiently Evaluate RAM Programs with Malicious Security.- Cube Attacks and Cube-Attack-Like Cryptanalysis on the Round-Reduced Keccak Sponge Function.- Twisted Polynomials and Forgery Attacks on GCM.- Quadratic Time, Linear Space Algorithms for Gram-Schmidt Orthogonalization and Gaussian Samplingin Structured Lattices.