6 papers
Key exchange protocol based on circulant matrix action over congruence-simple semiring
Alvaro Otero Sanchez
We present a new key exchange protocol based on circulant matrices acting on matrices over a congruence-simple semiring. We describe how to compute matrices with the necessary prop…
On key exchange protocol based on Two-side multiplication action
Alvaro Otero Sanchez
We present a cryptanalysis of a key exchange protocol based on the digital semiring. For this purpose, we find the maximal solution of a linear system over such semiring, and use t…
Cryptoanalysis of a tropical triad matrix semiring key exchange protocol
Alvaro Otero Sanchez
This article analyzes a key exchange protocol based on the triad tropical semiring, recently proposed by Jackson, J. and Perumal, R. We demonstrate that the triad tropical semiring…
A generalization of Burmester-Desmedt GKE based on a non-abelian finite group action
Daniel Camazón Portela, Álvaro Otero Sánchez, Juan Antonio López Ramos
The advent of large-scale quantum computers implies that our existing public-key cryptography infrastructure has become insecure. That means that the privacy of many mobile applica…
On the solutions of linear systems over additively idempotent semirings
Álvaro Otero Sánchez, Daniel Camazón, Juan Antonio López Ramos
The aim of this article is to solve the system where , and is an unknown vector of size , being an additively idempot…
Cryptoanalysis of a key exchange protocol based on a congruence-simple semiring action
Otero Sanchez Alvaro, Lopez Ramos Juan Antonio
We show that a previously introduced key exchange based on a congruence-simple semiring action is not secure by providing an attack that reveals the shared key from the distributed…