Specification and Verification of Side Channel Declassification
Paper i proceeding, 2010

Side channel attacks have emerged as a serious threat to the security of both networked and embedded systems -- in particular through the implementations of cryptographic operations. Side channels can be difficult to model formally, but with careful coding and program transformation techniques it may be possible to verify security in the presence of specific side-channel attacks. But what if a program intentionally makes a tradeoff between security and efficiency and leaks some information through a side channel? In this paper we study such tradeoffs using ideas from recent research on declassification. We present a semantic model of security for programs which allow for declassification through side channels, and show how side-channel declassification can be verified using off-the-shelf software model checking tools. Finally, to make it simpler for verifiers to check that a program conforms to a particular side-channel declassification policy we introduce a further tradeoff between efficiency and verifiability: by writing programs in a particular ``manifest form'' security becomes considerably easier to verify.

Författare

Josef Svenningsson

Chalmers, Data- och informationsteknik, Datavetenskap

David Sands

Chalmers, Data- och informationsteknik, Datavetenskap

Lecture Notes in Computer Science

0302-9743 (ISSN)

Vol. 5983 111-125

Ämneskategorier

Datavetenskap (datalogi)

DOI

10.1007/978-3-642-12459-4_9

ISBN

978-364212458-7