Marc Ilunga

Over two audits in 2023, we reviewed a blockchain system developed by Axiom that allows computing over the entire history of Ethereum, all verified by zero-knowledge proofs (ZKPs) on-chain using ZK-verified elliptic curve and SNARK recursion operations. This system is built using the Halo2 framework—a complex, emerging technology that presents many challenges when building a secure application, including potential under-constrained issues resulting from its low-level API.

Key derivation is essential in many cryptographic applications, including key exchange, key management, secure communications, and building robust cryptographic primitives. But it’s also easy to get wrong: although standard tools exist for different key derivation needs, our audits often uncover improper uses of these tools that could compromise key security. Flickr’s API […]

In October 2023, Ockam hired Trail of Bits to review the design of its product, a set of protocols that aims to enable secure communication (i.e., end-to-end encrypted and mutually authenticated channels) across various heterogeneous networks. A secure system starts at the design […]