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ESORICS
2011
Springer

Remote Timing Attacks Are Still Practical

7 years 6 months ago
Remote Timing Attacks Are Still Practical
For over two decades, timing attacks have been an active area of research within applied cryptography. These attacks exploit cryptosystem or protocol implementations that do not run in constant time. When implementing an elliptic curve cryptosystem with a goal to provide side-channel resistance, the scalar multiplication routine is a critical component. In such instances, one attractive method often suggested in the literature is Montgomery’s ladder that performs a fixed sequence of curve and field operations. This paper describes a timing attack vulnerability in OpenSSL’s ladder implementation for curves over binary fields. We use this vulnerability to steal the private key of a TLS server where the server authenticates with ECDSA signatures. Using the timing of the exchanged messages, the messages themselves, and the signatures, we mount a lattice attack that recovers the private key. Finally, we describe and implement an effective countermeasure.
Billy Bob Brumley, Nicola Tuveri
Added 20 Dec 2011
Updated 20 Dec 2011
Type Journal
Year 2011
Where ESORICS
Authors Billy Bob Brumley, Nicola Tuveri
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