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This book constitutes the refereed proceedings of the 6th International Conference on the Theory and Application of Cryptographic Techniques in Africa, AFRICACRYPT 2013, held in Cairo, Egypt, in June 2013. The 26 papers presented were carefully reviewed and selected from 77 submissions. They cover the following topics: secret-key and public-key cryptography and cryptanalysis, efficient implementation, cryptographic protocols, design of cryptographic schemes, security proofs, foundations and complexity theory, information theory, multi-party computation, elliptic curves, and lattices.
Adapting Lyubashevsky’s Signature Schemes to the Ring Signature Setting.- GPU-Based Implementation of 128-Bit Secure Eta Pairing over a Binary Field.- On Constructions of Involutory MDS Matrices.- Homomorphic Encryption with Access Policies: Characterization and New Constructions.- Brandt’s Fully Private Auction Protocol Revisited.- HELEN: A Public-Key Cryptosystem Based on the LPN and the Decisional Minimal Distance Problems.- Attacking AES Using Bernstein’s Attack on Modern Processors.- Optimal Public Key Traitor Tracing Scheme in Non-Black Box Model.- NaCl on 8-Bit AVR Microcontrollers.- W-OTS+ –Shorter Signatures for Hash-Based Signature Schemes.- New Speed Records for Salsa20 Stream Cipher Using an Autotuning Framework on GPUs.- Cryptanalysis of AES and Camellia with Related S-boxes.- New Results on Generalization of Roos-Type Biases and Related Keystreams of RC4.- Impact of Sboxes Size upon Side Channel Resistance and Block Cipher Design.- Efficient Multiparty Computation for Arithmetic Circuits against a Covert Majority.- Impact of Optimized Field Operations AB,AC and AB +CD in Scalar Multiplication over Binary Elliptic Curve.- An Attack on RSA Using LSBs of Multiples of the Prime Factors.- Modification and Optimisation of an ElGamal-Based PVSS Scheme.- Studying a Range Proof Technique —Exception and Optimisation.- Key-Leakage Resilient Revoke Scheme Resisting Pirates 2.0 in Bounded Leakage Model.- Fast Software Encryption Attacks on AES.- Sieving for Shortest Vectors in Ideal Lattices.- An Identity-Based Key-Encapsulation Mechanism Built on Identity-Based Factors Selection.- A Comparison of Time-Memory Trade-Off Attacks on Stream Ciphers.- On the Expansion Length of Triple-Base Number Systems.- Triple-Base Number System for Scalar Multiplication.