Relay based cooperative spectrum sensing elevates the spectrum sensing problems in harsh propagation conditions if the relay nodes are positioned suitably for the dynamic spectrum access systems. This article investigates the performance of relay based spectrum sensing (energy detection based) in myriad fading environments using the area under the receiver operating characteristic curve (AUC) p...

Security is a serious concern on today's computer networks. Many applications are not very good at resisting attack, and our operating systems are not very good at preventing the spread of any intrusions that may result. In this thesis, we propose to manage the risk of a security breach by con ning these untrusted (and untrustworthy) applications in a carefully sanitized space. We design a secu...

This paper shows how to implement a trusted network file system on an untrusted server. While cryptographic storage techniques exist that allow users to keep data secret from untrusted servers, this work concentrates on the detection of tampering attacks and stale data. Ideally, users of an untrusted storage server would immediately and unconditionally notice any misbehavior on the part of the ...

We propose a framework called configurable proofcarrying code, which allows the untrusted producer of mobile code to provide the bulk of the code verifier used by a code receiver to check the safety of the received code. The resulting system is both more flexible and also more trustworthy than a standard proof-carrying code system, because only a small part of the verifier needs to be trusted, ...

We address the problem of speeding up group computations in cryptography using a single untrusted computational resource. We analyze the security of an efficient protocol for securely outsourcing multiexponentiations proposed at ESORICS 2014. We show that this scheme does not achieve the claimed security guarantees and we present several practical polynomial-time attacks on the delegation proto...

Many popular programs, such as Netscape, use untrusted helper applications to process data from the network. Unfortunately, the unauthenticated network data they interpret could well have been created by an adversary, and the helper applications are usually too complex to be bug-free. This raises signi cant security concerns. Therefore, it is desirable to create a secure environment to contain ...

Many popular programs, such as Netscape, use untrusted helper applications to process data from the network. Unfortunately, the unauthenticated network data they interpret could well have been created by an adversary, and the helper applications are usually too complex to be bug-free. This raises signi cant security concerns. Therefore, it is desirable to create a secure environment to contain ...

Many networked applications could beneet from executing components of their functionality closer to the data or services with which they interact. By doing this they may be able to circumvent long communication latencies or avoid transferring large quantities of data over congested or expensive network links. However, no public infrastructure currently exists to enable users to do this; they ar...

We introduce CS50 Sandbox, an environment for secure execution of untrusted code. Implemented as an asynchronous HTTP server, CS50 Sandbox offers clients the ability to execute programs (both interactive and non-interactive) written in any compiled or interpreted language in a tightly controlled, resource-constrained environment. CS50 Sandbox’s HTTP-based API takes files, command lines, and sta...