My research is in cryptography. Besides my research, I am involved various standardization activities at NIST, ISO/IEC JTC1 SC27, and ASC X9F. I am also a co-author of the Triple DES (3DES) standard, which is one of only two block ciphers that are approved for use by the U.S. government.
I am perhaps best known as the designer of the Chaskey algorithm that is standardized in ISO/IEC 29192-6. Furthermore, I am the inventor of the MILP and SAT-based techniques that have now become the standard tools to analyze the security of cryptographic algorithms against attacks such as differential and linear cryptanalysis. In 2019, I discovered CVE-2019-8741, a vulnerability that affects the firmware of over 1.4 billion Apple devices.