IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Online ISSN : 1745-1337
Print ISSN : 0916-8508
Special Section on Cryptography and Information Security
Post-Quantum Security of IGE Mode Encryption in Telegram
Jeeun LEESungsook KIMSeunghyun LEEKwangjo KIM
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2019 Volume E102.A Issue 1 Pages 148-151

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Abstract

IGE mode used in Telegram's customized protocol has not been fully investigated in terms of post-quantum security. In this letter, we show that IGE mode is IND-qCPA insecure by Simon's algorithm, assuming that the underlying block cipher is a standard-secure pseudorandom function (sPRF). Under a stronger assumption that the block cipher is a quantum-secure pseudorandom function (qPRF), IND-qCPA security of IGE mode is proved using one-way to hiding lemma.

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© 2019 The Institute of Electronics, Information and Communication Engineers
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