Category: cryptanalysis

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SIKE Broken

Posted on By infossl
algorithms, cryptanalysis, cryptography, encryption, nist, quantum computing, Security technology, Uncategorized

SIKE is one of the new algorithms that NIST recently added to the post-quantum cryptography competition. It was just broken, really badly. We present an efficient key recovery attack on the Supersingular Isogeny Diffie­-Hellman protocol (SIDH), based on a “glue-and-split” theorem due to Kani. Our attack exploits the existence of a small non-scalar endomorphism on … Read More “SIKE Broken” »

Breaking RSA through Insufficiently Random Primes

Posted on By infossl
cryptanalysis, keys, pgp, random numbers, rsa, Security technology, Uncategorized

Basically, the SafeZone library doesn’t sufficiently randomize the two prime numbers it used to generate RSA keys. They’re too close to each other, which makes them vulnerable to recovery. There aren’t many weak keys out there, but there are some: So far, Böck has identified only a handful of keys in the wild that are … Read More “Breaking RSA through Insufficiently Random Primes” »

Decrypting Hive Ransomware Data

Posted on By infossl
academic papers, cryptanalysis, encryption, ransomware, Security technology, Uncategorized

Nice piece of research: Abstract: Among the many types of malicious codes, ransomware poses a major threat. Ransomware encrypts data and demands a ransom in exchange for decryption. As data recovery is impossible if the encryption key is not obtained, some companies suffer from considerable damage, such as the payment of huge amounts of money … Read More “Decrypting Hive Ransomware Data” »

Intentional Flaw in GPRS Encryption Algorithm GEA-1

Posted on By infossl
academic papers, algorithms, backdoors, cryptanalysis, encryption, Security technology, Uncategorized

General Packet Radio Service (GPRS) is a mobile data standard that was widely used in the early 2000s. The first encryption algorithm for that standard was GEA-1, a stream cipher built on three linear-feedback shift registers and a non-linear combining function. Although the algorithm has a 64-bit key, the effective key length is only 40 … Read More “Intentional Flaw in GPRS Encryption Algorithm GEA-1” »

No, RSA Is Not Broken

Posted on By infossl
cryptanalysis, cryptography, rsa, Security technology, Uncategorized

I have been seeing this paper by cryptographer Peter Schnorr making the rounds: “Fast Factoring Integers by SVP Algorithms.” It describes a new factoring method, and its abstract ends with the provocative sentence: “This destroys the RSA cryptosystem.” It does not. At best, it’s an improvement in factoring — and I’m not sure it’s even … Read More “No, RSA Is Not Broken” »

Denmark, Sweden, Germany, the Netherlands and France SIGINT Alliance

Posted on By infossl
academicpapers, cryptanalysis, gchq, historyofsecurity, intelligence, Security technology

This paper describes a SIGINT and code-breaking alliance between Denmark, Sweden, Germany, the Netherlands and France called Maximator: Abstract: This article is first to report on the secret European five-partner sigint alliance Maximator that started in the late 1970s. It discloses the name Maximator and provides documentary evidence. The five members of this European alliance … Read More “Denmark, Sweden, Germany, the Netherlands and France SIGINT Alliance” »