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In this paper we introduced countermeasures against side-channel attacks inthe shared memory of TrustZone. We proposed zero-contention cache memory orpolicy between REE and TEE to prevent from TruSpy attacks in TrustZone. And wesuggested that delay time of data path of REE is equal or similar to that ofdata path of TEE to prevent timing side-channel attacks. Also, we proposedsecurity information flow control based on the Clark-Wilson model, and builtthe information flow control mechanism using Authentication TokenizationProgram (ATP). Accordingly we can expect the improved integrity of theinformation content between REE and TEE on mobile devices.

Countermeasure against Side-Channel Attack in Shared Memory of TrustZone