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Novel hardware-aided trusted execution environments, as provided by Intel'sSoftware Guard Extensions (SGX), enable to execute applications in a securecontext that enforces confidentiality and integrity of the application stateeven when the host system is misbehaving. While this paves the way towardssecure and trustworthy cloud computing, essential system support to protectpersistent application state against rollback and forking attacks is missing.  In this paper we present LCM - a lightweight protocol to establish acollective memory amongst all clients of a remote application to detectintegrity and consistency violations. LCM enables the detection of rollbackattacks against the remote application, enforces the consistency notion offork-linearizability and notifies clients about operation stability. Theprotocol exploits the trusted execution environment, complements it with simpleclient-side operations, and maintains only small, constant storage at theclients. This simplifies the solution compared to previous approaches, wherethe clients had to verify all operations initiated by other clients. We haveimplemented LCM and demonstrated its advantages with a key-value storeapplication. The evaluation shows that it introduces low network andcomputation overhead; in particular, a LCM-protected key-value store achieves0.72x - 0.98x of a SGX-secured key-value store throughput.

Rollback and Forking Detection for Trusted Execution Environments using Lightweight Collective Memory