Matt Cheung

Application Security Consultant

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Matt Cheung Application Security Consultant, Veracode

Matt Cheung started developing his interest in cryptography during an internship in 2011. He worked on implementation of a secure multi-party protocol by adding elliptic curve support to an existing secure text pattern matching protocol. Implementation weaknesses were not a priority and this concerned Matt. This concern prompted him to learn about cryptographic attacks from Dan Boneh's crypto 1 course offered on Coursera and the Matasano/cryptopals challenges. From this experience he has given workshops at the Boston Application Security Conference, BSidesLV, DEF CON, and the Crypto and Privacy Village.

Workshop: Introduction to Cryptographic Attacks

Workshops are first-come, first-serve and have limited capacity. Some workshops may be streamed for additional passive participation.

Using cryptography is often a subtle practice and mistakes can result in significant vulnerabilities. This workshop will cover many of these vulnerabilities which have shown up in the real world, including CVE-2020-0601. This will be a hands-on workshop where you will implement the attacks after each one is explained. I will provide a VM with a tool I developed called cryptosploit. A good way to determine if this workshop is for you is to look at the challenges at and see if those look interesting, but you could use in person help understanding the attacks. While not a strict subset of those challenges, there is significant overlap.

Participants should prepare by:

Students should be comfortable with concepts like modular arithmetic and XOR.

Participants must have the following equipment:

A laptop will be useful as I will bring a VM for students to follow along and practice running attacks.