Overview
- Description
- Generating the ECDSA nonce k samples a random number r and then truncates this randomness with a modular reduction mod n where n is the order of the elliptic curve. Meaning k = r mod n. The division used during the reduction estimates a factor q_e by dividing the upper two digits (a digit having e.g. a size of 8 byte) of r by the upper digit of n and then decrements q_e in a loop until it has the correct size. Observing the number of times q_e is decremented through a control-flow revealing side-channel reveals a bias in the most significant bits of k. Depending on the curve this is either a negligible bias or a significant bias large enough to reconstruct k with lattice reduction methods. For SECP160R1, e.g., we find a bias of 15 bits.
- Source
- facts@wolfssl.com
- NVD status
- Awaiting Analysis
Risk scores
CVSS 3.1
- Type
- Secondary
- Base score
- 4.1
- Impact score
- 3.6
- Exploitability score
- 0.5
- Vector string
- CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
- Severity
- MEDIUM
Weaknesses
- facts@wolfssl.com
- CWE-203
Social media
- Hype score
- Not currently trending