Show simple item record

dc.contributor.advisorTummala, Murali
dc.contributor.advisorMcEachen, John
dc.contributor.authorGonçalves, Ricardo André Santana
dc.dateJun-11
dc.date.accessioned2016-03-03T23:26:36Z
dc.date.available2016-03-03T23:26:36Z
dc.date.issued2011-06
dc.identifier.urihttp://hdl.handle.net/10945/48138
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractCovert channels in modern communication networks are a source of security concerns. Such channels can be used to facilitate command and control of botnets or inject malicious contents into unsuspected end-user devices or network nodes. The vast majority of the documented covert channels make use of the upper layers of the Open Systems Interconnection (OSI) model. In this thesis, we present a new covert channel in IEEE 802.11 networks, making use of the Protocol Version field in the Medium Access Control (MAC) header. This is achieved by forging modified Clear To Send (CTS) and Acknowledgment (ACK) frames. Forward error correction mechanisms and interleaving were implemented to increase the proposed channel's robustness to error. A laboratory implementation of the proposed channel is presented by developing the necessary code in Python, operating in a Linux environment. We present the results of tests conducted on the proposed channel, including measurements of channel errors, available data rate for transmission, and level of covertness.en_US
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.rightsCopyright is reserved by the copyright owner.en_US
dc.titleA MAC layer covert channel in 802.11 networksen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical and Computer Engineering
dc.subject.authorIEEE802.11 MAC frameen_US
dc.subject.authorFrame forgingen_US
dc.subject.authorCovert channelen_US
dc.subject.authorProtocol versionen_US
dc.description.serviceLieutenant, Portuguese Navyen_US
etd.thesisdegree.nameMaster of Science in Electrical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineElectrical and Computer Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record