A Survey on Cache Timing Channel Attacks for Multicore Processors

Cache timing channel attacks has attained a lot of attention in the last decade. These attacks exploits the timing channel created by the significant time gap between cache and main memory accesses. It has been successfully implemented to leak the secret key of various cryptography algorithms. The latest advancements in cache attacks also exploit other micro-architectural components such as hardware prefetchers, branch predictor, and replacement engine, in addition to the cache memory. Detection of these attacks is a difficult task as the attacker process running in the processor must be detected before significant portion of the attack is complete. The major challenge for mitigation and defense mechanisms against these attacks is maintaining the system performance while disabling or avoiding these attacks. The overhead caused by detection, mitigation and defense mechanism must not be significant to system’s performance. This paper discusses the research carried out in three aspects of cache security: cache timing channel attacks, detection techniques of these attacks, and defense mechanisms in details.