Description
The worldwide dial plan proposed by the International Telecommunication Union recommendation E.164 reserves multiple country codes for future use. These unused codes present an opportunity for a potential covert channel over the public switched telephone network utilizing a spoofed source phone number of a call to send information to a mobile device. The reserved country codes can act as a delimiter indicating that a secret message is being sent. By spooï¬ng a call using a reserved country code number, the application listening on the mobile device will be able to intercept the call and extract information from the remaining digits based on ASCII encoding in a decimal format. The purpose of using a reserved country code number is so that there will be no denied service to the user with a call from a legitimate phone number.
Date of creation, presentation, or exhibit
5-31-2015
Document Type
Conference Paper
Department, Program, or Center
Department of Computing Security (GCCIS)
Recommended Citation
Harmat, Bryan; Stroud, Jared; and Johnson, Daryl, "A Covert Channel in the Worldwide Public Switched Telephone Network Dial Plan" (2015). Accessed from
https://repository.rit.edu/other/851
Campus
RIT – Main Campus
Comments
Originally presented at the 10th Annual Symposium on Information Assurance (ASIA '15) June 2-3, Albany NY