A network covert channel is a mechanism that can be used to leak information across a network in violation of a security policy and in a manner that can be difficult to detect. Covert channels exist ...

Malware authors are using a new technique to keep their communications covert and evade detection: abusing the DNS protocol. According to Fidelis Security, DNS command and control (C&C) and DNS ...

Researchers bypass Android security mechanisms and exploit smartphone cellular voice channel to act as a new covert channel which can potentially be used to leak information and to spread malware.