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The Tigress Diversifying C Virtualizer supports against various novel defenses, static and dynamic alike, against well-known de-virtualization attacks. Furthermore, Tigress contains a collection of traditional obfuscating transformations such as control-flow flattening, opaque predicate insertion, and function merging and splitting. As a result, the...

Published: 6/23/2023 | Inventor(s): Christian Collberg, Jonathan Myers, Sam Martin

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Category(s): Technology Classifications > Software & Information Technology > Communications & Networking

Obfuscated Dynamic CAPTCHAs

This invention is a new kind of CAPTCHA, something that tests web applications to determine whether the user is a human. The CAPTCHAs can ask a user to solve dynamic puzzles, i.e. something that changes based on user input, but also the code that executes these CAPTCHAs runs on the client, such as the user’s browser. This means that less work...

Published: 4/3/2023 | Inventor(s): Christian Collberg, Jasvir Nagra, Yang Yang Lu

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Category(s): Technology Classifications > Software & Information Technology