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What a lovely hat

Is it made out of tin foil?




Dates are inconsistent

Dates are inconsistent

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Possible spell-corrected query: close look invariant
2021/336 (PDF) Last updated: 2021-03-17
On Closed-Cycle Loops and Applicability of Nonlinear Product Attacks to DES
Nicolas T. Courtois, Matteo Abbondati, Hamy Ratoanina, Marek Grajek
Secret-key cryptography

In this article we look at the question of the security of Data Encryption Standard (DES) against non-linear polynomial invariant attacks. Is this sort of attack also possible for DES? We present a simple proof of concept attack on DES where a product of 5 polynomials is an invariant for 2 rounds of DES. Furthermore we present numerous additional examples of invariants with higher degrees. We analyse the success probability when the Boolean functions are chosen at random and compare to DES...

2020/1095 (PDF) Last updated: 2020-09-15
Cycle structure of generalized and closed loop invariants
Yongzhuang Wei, Rene Rodriguez, Enes Pasalic
Secret-key cryptography

This article gives a rigorous mathematical treatment of generalized and closed loop invariants (CLI) which extend the standard notion of (nonlinear) invariants used in the cryptanalysis of block ciphers. Employing the cycle structure of bijective S-box components, we precisely characterize the cardinality of both generalized and CLIs. We demonstrate that for many S-boxes used in practice quadratic invariants (especially useful for mounting practical attacks in cases when the linear...

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