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749 results
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Seminar
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Cryptography
Quantum Linear Key-recovery Attacks Using the QFT
Speaker : André Schrottenloher - IRISA
The Quantum Fourier Transform is a fundamental tool in quantum cryptanalysis, not only as the building block of Shor's algorithm, but also in attacks against symmetric cryptosystems. Indeed, hidden shift algorithms such as Simon's (FOCS 1994), which rely on the QFT, have been used to obtain attacks on some very specific block cipher structures. The Fourier Transform is also used in classical[…] -
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Seminar
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Cryptography
Generic Attack on Duplex-Bases AEAD Modes using Random Function Statistics
Speaker : Rachelle Heim Boissier - Inria
Duplex-based authenticated encryption modes with a sufficiently large key length are proven to be secure up to the birthday bound 2^(c/2), where c is the capacity. However this bound is not known to be tight and the complexity of the best known generic attack, which is based on multicollisions, is much larger: it reaches 2^c/α where α represents a small security loss factor. There is thus an[…] -
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Seminar
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Cryptography
TBD (To be decided closer to the date of the talk)
Speaker : Lisa Kohl - CWI
TBD (To be decided closer to the date of the talk) -
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Seminar
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Cryptography
How fast do you heal? A taxonomy for post-compromise security in secure-channel establishment.
Speaker : Léo Robert - Université d'Amiens
Post-Compromise Security (PCS) is a property of secure-channel establishment schemes, which limits the security breach of an adversary that has compromised one of the endpoint to a certain number of messages, after which the channel heals. An attractive property, especially in view of Snowden's revelation of mass-surveillance, PCS features in prominent messaging protocols such as Signal. In this[…] -
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Seminar
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Cryptography
SCA-LDPC: A Code-Based Framework for Key-Recovery Side-Channel Attacks on Post-Quantum Encryption Schemes
Speaker : Denis Nabokov - Université de Lund
Whereas theoretical attacks on standardized crypto primitives rarely lead to actual practical attacks, the situation is different for side-channel attacks. Improvements in the performance of side-channel attacks are of utmost importance. In this paper, we propose a framework to be used in key-recovery side-channel attacks on CCA-secure post-quantum encryption schemes. The basic idea is to[…] -
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Seminar
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Cryptography
Shorter Lattice-Based Fiat-Shamir Signatures
Speaker : Julien Devevey - ANSSI
We present HAETAE (Hyperball bimodAl modulE rejecTion signAture schemE), a new lattice-based signature scheme, which we submitted to the Korean Post-Quantum Cryptography Competition for standardization. Like the NIST-selected Dilithium signature scheme, HAETAE is based on the Fiat-Shamir with Aborts paradigm, but our design choices target an improved complexity/compactness compromise that is[…] -