Out-of-band meaning

(1) Separate from the primary frequency or system. See signaling in/out-of-band and out-of-band data.
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(communications engineering) Out-of-band signaling describes signals that are sent between two parties or two devices that are sent via a path or method different from that of the primary communication between the two parties or devices.
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(computer security) Out-of-band communication or out-of-band identity verification involves a program or authentication system's challenge and response to a user via a method other than the primary means of accessing the software. For example, a web application might request verification of a user's identity by sending that user an IM, rather than by presenting a web form for username and password entry.
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