International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Giorgia Azzurra Marson

Affiliation: Ruhr University Bochum

Publications

Year
Venue
Title
2017
TOSC
Security Notions for Bidirectional Channels
Giorgia Azzurra Marson Bertram Poettering
This paper closes a definitional gap in the context of modeling cryptographic two-party channels. We note that, while most security models for channels consider exclusively unidirectional communication, real-world protocols like TLS and SSH are rather used for bidirectional interaction. The motivational question behind this paper is: Can analyses conducted with the unidirectional setting in mind—including the current ones for TLS and SSH—also vouch for security in the case of bidirectional channel usage? And, in the first place, what does security in the bidirectional setting actually mean? After developing confidentiality and integrity notions for bidirectional channels, we analyze a standard way of combining two unidirectional channels to realize one bidirectional channel. Although it turns out that this construction is, in general, not as secure as commonly believed, we confirm that for many practical schemes security is provided also in the bidirectional sense.
2015
CRYPTO
2014
EPRINT

Program Committees

Asiacrypt 2020
Asiacrypt 2019