Authenticated key exchange under bad randomness

Authenticated key exchange under bad randomness

We initiate the formal study on authenticated key exchange (AKE) under bad randomness. This could happen when (1) an adversary compromises the randomness source and hence directly controls the randomness of each AKE session; and (2) the randomness repeats in different AKE sessions due to reset attac...

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Bibliographic Details
Main Authors: YANG, Guomin, DUAN, Shanshan, WONG, Duncan S., TAN, Chik How, WANG, Huaxiong
Format: text
Language:English
Published: Institutional Knowledge at Singapore Management University 2011
Subjects:
Authenticated Key Exchange
Resettable Cryptography
Bad Randomness
Information Security
Online Access:https://ink.library.smu.edu.sg/sis_research/7416
https://ink.library.smu.edu.sg/context/sis_research/article/8419/viewcontent/Authenticated_key_exchange_under_bad_randomness.pdf
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Institution: Singapore Management University
Language: English
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Summary:We initiate the formal study on authenticated key exchange (AKE) under bad randomness. This could happen when (1) an adversary compromises the randomness source and hence directly controls the randomness of each AKE session; and (2) the randomness repeats in different AKE sessions due to reset attacks. We construct two formal security models, Reset-1 and Reset-2, to capture these two bad randomness situations respectively, and investigate the security of some widely used AKE protocols in these models by showing that they become insecure when the adversary is able to manipulate the randomness. On the positive side, we propose simple but generic methods to make AKE protocols secure in Reset-1 and Reset-2 models. The methods work in a modular way: first, we strengthen a widely used AKE protocol to achieve Reset-2 security, then we show how to transform any Reset-2 secure AKE protocol to a new one which also satisfies Reset-1 security.

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