Researchers reveal faster RSA blind-signature attack
Researchers from UC San Diego and Inria Nancy have demonstrated a faster attack on RSA blind-signature schemes. The new technique, which does not rely on factoring the encryption key, can forge signatures using significantly fewer computations than previously known methods. The attack poses little immediate threat to widely used RSA implementations that use padding schemes, but it sharply lowers the estimated security of systems relying on textbook RSA.
- Attack breaks blind-signature RSA faster than factoring
- Does not threaten padded RSA as used in most systems
- Requires 1,380 CPU core-years for a 1,024-bit key
- Researchers warn textbook RSA now far less secure
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