Estimating and measuring covert channel bandwidth in multilevel secure operating systems

Shiuhpyng Shieh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Covert channels are illicit means of leaking sensitive or private information through system global variables that usually are not part of the interpretation of data objects in the security model. We discovered that some covert channels can be modeled as finite-state graphs while others cannot. By using various techniques given in the paper, multiple bits of information can be simultaneously transferred through single or multiple covert channels. We present methods to determine and estimate the maximum bandwidths of both finite-state and infinite-state channels, and give the problems and basic rules for their measurement.

Original languageEnglish
Pages (from-to)91-106
Number of pages16
JournalJournal of Information Science and Engineering
Volume15
Issue number1
DOIs
StatePublished - 1 Jan 1999

Keywords

  • Covert channel bandwidth
  • Multilevel secure systems
  • System calls

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