196 citations · 318 across the 11 of their papers we have counts for
12 papers
Crypto Currency Regulation and Law Enforcement Perspectives
Nicolas T. Courtois, Kacper T. Gradon, Klaus Schmeh
This paper provides an overview of how crypto currency and blockchain engineering interacts with the law enforcement. We point out that a large proportion of crypto users are amate…
Invariant Hopping Attacks on Block Ciphers
Nicolas T. Courtois
Block ciphers are in widespread use since the 1970s. Their iterated structure is prone to numerous round invariant attacks for example in Linear Cryptanalysis (LC). The next step i…
Lack of Unique Factorization as a Tool in Block Cipher Cryptanalysis
Nicolas T. Courtois, Aidan Patrick
Linear (or differential) cryptanalysis may seem dull topics for a mathematician: they are about super simple invariants characterized by say a word on n=64 bits with very few bits…
Constructive Non-Linear Polynomial Cryptanalysis of a Historical Block Cipher
Nicolas T. Courtois, Marios Georgiou
One of the major open problems in symmetric cryptanalysis is to discover new specif i c types of invariant properties which can hold for a larger number of rounds of a block cipher…
Distributed Ledger Privacy: Ring Signatures, Möbius and CryptoNote
Christopher D. Clack, Nicolas T. Courtois
Distributed ledger and blockchain systems are expected to make financial systems easier to audit, reduce counter-party risk and transfer assets seamlessly. The key concept is a tok…
The Evolution of Embedding Metadata in Blockchain Transactions
Tooba Faisal, Nicolas Courtois, Antoaneta Serguieva
The use of blockchains is growing every day, and their utility has greatly expanded from sending and receiving crypto-coins to smart-contracts and decentralized autonomous organiza…