Doctor of Philosophy / Department of Computing and Information Sciences / David A. Schmidt, Anindya Banerjee, Thomas Jensen / With the intensification of communication in information systems, interest in security has
increased. The notion of noninterference is typically used as a baseline security policy to formalize
confidentiality of secret information manipulated by a program. This notion, based on
ideas from classical information theory, has first been introduced by Goguen and Meseguer
(1982) as the absence of strong dependency (Cohen, 1977).
"information is transmitted from a source to a destination only when variety in the
source can be conveyed to the destination" Cohen (1977)
Building on the notion proposed by Goguen and Meseguer, a program is typically said to be
noninterfering if the values of its public outputs do not depend on the values of its secret inputs.
If that is not the case then there exist illegal information flows that allow an attacker, having
knowledge about the source code of the program, to deduce information about the secret inputs
from the public outputs of the execution.
In contrast to the vast majority of previous work on noninterference which are based on
static analyses (especially type systems), this PhD thesis report considers dynamic monitoring
of noninterference. A monitor enforcing noninterference is more complex than standard
execution monitors.
"the information carried by a particular message depends on the set it comes from.
The information conveyed is not an intrinsic property of the individual message."
Ashby (1956).
The work presented in this report is based on the combination of dynamic and static information
flow analyses. The practicality of such an approach is demonstrated by the development
of a monitor for concurrent programs including synchronization commands. This report also
elaborates on the soundness with regard to noninterference and precision of such approaches.
| Identifer | oai:union.ndltd.org:KSU/oai:krex.k-state.edu:2097/472 |
| Date | January 1900 |
| Creators | Le Guernic, Gurvan |
| Publisher | Kansas State University |
| Source Sets | K-State Research Exchange |
| Language | en_US |
| Detected Language | English |
| Type | Dissertation |
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