A cartoon wild canid on the Internet provides general guidance on elliptic curve cryptography parameter choices.
Who knew Hybrid Cryptography (which combines Post-Quantum Cryptography with Pre-Quantum Cryptography) would be controversial?
Canonicalization Attacks occur when a protocol that feeds data into a hash function used in a Message Authentication Code (MAC) or Digital Signature calculation fails to ensure some property that’s expected of the overall protocol. The textbook example of a canonicalization attack is the length-extension attack against hash functions such as MD5–which famously broke the […]
A paper was published on the IACR’s ePrint archive yesterday, titled LadderLeak: Breaking ECDSA With Less Than One Bit of Nonce Leakage. The ensuing discussion on /r/crypto led to several interesting questions that I thought would be worth capturing and answering in detail. What’s Significant About the LadderLeak Paper? This is best summarized by Table […]
In 2017, cryptography researchers from Kudelski Security demonstrated practical fault attacks against EdDSA (specifically Ed25519; RFC 8032). Their techniques are also applicable to Deterministic ECDSA (RFC 6979), and potentially work against any deterministic signature scheme (n.b. the Fiat-Shamir or Schnorr distinction isn’t meaningful in this context). Although that might seem alarming, fault attacks aren’t especially […]
Let’s talk about digital signature algorithms. Digital signature algorithms are one of the coolest ideas to come out of asymmetric (a.k.a. public-key) cryptography, but they’re so simple and straightforward that most cryptography nerds don’t spend a lot of time thinking about them. Even though you are more likely to run into a digital signature as […]