callback


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callback

(programming)
A scheme used in event-driven programs where the program registers a subroutine (a "callback handler") to handle a certain event. The program does not call the handler directly but when the event occurs, the run-time system calls the handler, usually passing it arguments to describe the event.

callback

(communications, security)
A user authentication scheme used by some computers running dial-up services. The user dials in to the computer and gives his user name and password. The computer then hangs up the connection and uses an auto-dial modem to call back to the user's registered telephone number. Thus, if an unauthorised person discovers a user's password, the callback will go, not to him, but to the owner of that login who will then know that his account is under attack.

However, some PABXs can be fooled into thinking that the caller has hung up by sending them a dial tone. When the computer tries to call out on the same line it is not actually dialing through to the authorised user but is still connected to the original caller.

callback

(communications)

callback

An authentication technique that calls the sender back. After connection is made, the receiving side breaks the connection and calls the sender to ensure that the logon was made from the authorized computer. Callback prevents a stolen ID and password from being used on a different machine. See also Web callback.
References in periodicals archive ?
She had no speech recognition barriers; she was quite happy with the offered callback service and had full confidence it would work.
Roamers CallBack solution allows subscribers, who are traveling outside the coverage area of their mobile operator, to place calls to their home network at cheaper rates avoiding costly roaming and interconnection charges.
Callback can also help organizations avoid the vicious cycle between less than ideal service levels and talk time--as service levels drop, average handle times climb.
9 percent of applicants with a public certificate got callbacks, compared with 4.
CnC servers are used heavily during the lifecycle of an attack to maintain communication with an infected machine by way of callbacks, enabling the attacker to download and modify malware to evade detection, extract data, or expand an attack within a target organization.
The Cancer Callback scheme is free and patients can sign up to it by calling Tenovus on 0808 808 1010.
The cost of responding to callbacks increased over the past year, despite the prevalence of relatively minor issues.
It offers more flexibility as well as the advantage of callback.
Design Parameter & Callback Standard: A design library or an individual design may have a set of parameters associated with it.
And those solutions can and do include omni-channel callback.
Tenovus Cancer Callback service, launched today, will offer newly diagnosed cancer patients across Wales a series of regular calls from an experienced nurse.
The median cost per callback was $200, also similar to earlier surveys.