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This book constitutes the refereed proceedings of the 18th International Conference on Cryptology in India, INDOCRYPT 2017, held in Chennai, India, in December 2017. The 19 revised full papers presented in this book were carefully reviewed and selected from 75 submissions. The focus of the conference includes works on Public-Key Cryptography, Cryptographic Protocols, Side-Channel Attacks, Implementation of Cryptographic Schemes, Functional Encryption, Symmetric-Key Cryptanalysis, Foundations, and New Cryptographic Constructions.

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Post-Quantum Cryptography using Module Lattices.- Recent Advances in Function & Homomorphic Secret Sharing.- A note on Ring-LWE security in the case of Fully Homomorphic Encryption.- Architecture level Optimizations for Kummer based HECC on FPGAs.- Bricklayer Attack: A Side-Channel Analysis on the ChaCha Quarter Round.- CCA-secure Predicate Encryption from Pair Encoding in Prime Order Groups: Generic and Efficient.- Cold Boot Attacks on NTRU.- DSA Signing Key Recovery with Noisy Side Channels and Varying Error Rates.- Fast Scalar Multiplication for Elliptic Curves over Binary Fields.- Field lifting for smaller UOV public keys.- Gabidulin matrix codes and their application to small ciphertext size cryptosystems.- Lightweight Design Choices for LED-like Block Ciphers.- Looting the LUTs : FPGA Optimization of AES and AES-like Ciphers for Authenticated Encryption.- Improved Differential Cryptanalysis on Generalized Feistel Schemes.- Improvements for Gate-Hiding Garbled Circuits.- Recovering Short Generators of Principal Fractional Ideals in Cyclotomic Fields of Conductor p_q.- Revisiting a Masked Lookup-Table Compression Scheme.-

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