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Trust is arguably the most important challenge for critical services bothdeployed as well as accessed remotely over the network. These systems areexposed to a wide diversity of threats, ranging from bugs to exploits, activeattacks, rogue operators, or simply careless administrators. To protect suchapplications, one needs to guarantee that they are properly configured andsecurely provisioned with the "secrets" (e.g., encryption keys) necessary topreserve not only the confidentiality, integrity and freshness of their databut also their code. Furthermore, these secrets should not be kept under thecontrol of a single stakeholder - which might be compromised and wouldrepresent a single point of failure - and they must be protected acrosssoftware versions in the sense that attackers cannot get access to them viamalicious updates. Traditional approaches for solving these challenges oftenuse ad hoc techniques and ultimately rely on a hardware security module (HSM)as root of trust. We propose a more powerful and generic approach to trustmanagement that instead relies on trusted execution environments (TEEs) and aset of stakeholders as root of trust. Our system, PALAEMON, can operate as amanaged service deployed in an untrusted environment, i.e., one can delegateits operations to an untrusted cloud provider with the guarantee that data willremain confidential despite not trusting any individual human (even with rootaccess) nor system software. PALAEMON addresses in a secure, efficient andcost-effective way five main challenges faced when developing trusted networkedapplications and services. Our evaluation on a range of benchmarks and realapplications shows that PALAEMON performs efficiently and can protect secretsof services without any change to their source code.

Trust Management as a Service: Enabling Trusted Execution in the Face of Byzantine Stakeholders