Welcome to the resource topic for 2020/956
Title:
Constant Time Montgomery Ladder
Authors: Kaushik Nath, Palash Sarkar
Abstract:In this work various approaches for constant time conditional branching in Montgomery ladder have been studied. A previous method appearing in a code for implementing X25519 has been formalized algorithmically. This algorithm is based on a conditional select operation. We consider a variant of this algorithm which groups together operations in a more convenient manner. Further, we provide a new implementation of the conditional select operation using the cmov operation such that cmov works only on registers. This provides a better guarantee of constant time behavior.
ePrint: https://eprint.iacr.org/2020/956
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