AuthorAdam Caudill

2018 Sponsors & Prizes

Underhanded Crypto Contest participants put a lot of effort into their submissions, and it’s important for us to reward that effort. For the 2018 Underhanded Crypto Contest, we have two generous sponsors that have agreed to provide cash prizes for our winners. See the contest rules for more information. Note: Due to tax regulations, winners may be required to complete certain tax forms to...

Rules for the 2018 Underhanded Crypto Contest

Introduction The Underhanded Crypto contest was inspired by the famous Underhanded C Contest, which is a contest for producing C programs that look correct, yet are flawed in some subtle way that makes them behave inappropriately. This is a great model for demonstrating how hard code review is, and how easy it is to slip in a backdoor even when smart people are paying attention. The Underhanded...

Announcing the 2017 Winners!

We are proud to announce the winners of the 2017 Underhanded Crypto Contest! First Place: JP Smith and Will Song Second Place: Neville Longbottom The announcement was made by Adam Caudill at the DEF CON Crypto & Privacy Village on Friday, July 28th; below is the approximate text of the talk given at the event, the slides are also available. Slide 1: Hi everyone, I’m Adam Caudill, and...

2017 Winner: JP Smith and Will Song

The well-deserved winner of the 2017 Underhanded Crypto Contest is JP Smith and Will Song for a curve generator for a SIDH, a post-quantum key exchange. This curve generator appears on the surface to function properly, but in reality in certain circumstances the curve generated isn’t supersingular – this doesn’t pose a threat if the attacker is using classical computers, but...

2017 Runner-Up: Neville Longbottom

In second place for the 2017 Underhanded Crypto Contest is “Neville Longbottom” for an application that uses AES to encrypt data, but has special behavior for long messages. For this entry, the author was awarded a prize of $500 provided by NCC Group Cryptography Services; at the authors request, the prize has been donated to the EFF. From the author: Introduction My submission to the...

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