Timing Attack against RSA on Cache Missing
Qi Chen · Microelectronics & Computer · 2009
Simultaneous multithreading enables multiple execution threads to share the execution resources of a superscalar,the shared access to memory caches provides an easily used high bandwidth covert channel between threads,allowing that a malicious thread can monitor the execution of another thread.This paper targets at RSA cryptosystem implemented via OpenSSL0.9.7c,monitores the cryptographic thread by executing a Spy thread,recording the timing characteristic during the RSA decryption when reading the Cache.The attacker can recovers the original key by analyzing these timing measurement.Finally,we provide some suggestions of how this attack could be mitigated or eliminated entirely.