Covert channel for conveying supplemental messages in a...

Electrical computers and digital data processing systems: input/ – Intrasystem connection – Protocol

Reexamination Certificate

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Details

C710S005000, C710S074000, C710S315000

Reexamination Certificate

active

07571269

ABSTRACT:
Disclosed are communication apparatus, a SATA communication device, a system, an enhanced port multiplier and a method for, among other things, establishing a covert communication channel in a protocol-compliant link. In one embodiment, a communication apparatus includes a link interface and a supplemental message interface. The link interface is configured to communicatively couple the communication apparatus to the link for accessing a data stream passing through the link in accordance with a standardized protocol. The supplemental message interface is configured to exchange a supplemental message within the data stream to establish a covert communication channel in the link. The supplemental message supplements the standardized protocol without violating the protocol.

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