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Chaos Communication Congress: Season 34

34x15 Squeezing a key through a carry bit

  • 2017-12-27T00:00:00Z
  • 1h
  • English
Speaker: Filippo Valsorda 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.
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