34C3 - Squeezing a key through a carry bit

Title:: 34C3 - Squeezing a key through a carry bit
Description:: https://media.ccc.de/c/34c3/34c3-9021-squeezing_a_key_through_a_carry_bit

The Go implementation of the P-256 elliptic curve had a small bug due to a misplaced carry bit affecting less than 0.00000003% of field subtraction operations. We show how to build a full practical key recovery attack on top of it, capable of targeting JSON Web Encryption.

Filippo Valsorda

https://fahrplan.events.ccc.de/congress/2017/Fahrplan/events/9021.html

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Video Language:: English
Duration:: 50:02

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