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Backdoor
A software or hardware mechanism that is hidden and can be triggered to allow system protection mechanisms to be circumvented. The act will by and large supply unusually high, or sometimes even full, access to the system either without an account or from an account that is usually restricted. Backdoor can also be used by sending a certain packet to a secure server network port, see rat. Developer of software recurrently introduce backdoors in their code to allow themselves the luxury of reentering the system and performing particular functions, see maintenance hook.
Background Task
An assignment performed by the system that by and large stays invisible to the user. The majority of the procedures in davanced or multi-user systems function in the background. Some malware is performed by a system as a background task so that the user doesn’t recognize that unwanted actions are happening. A lot of attacks recurrently take advantage of loopholes in utility procedures working in the background.
Back up
A replicated copy of data this is made for archiving purposes and protecting against the loss of data in case of loss or damage. A back up must be stored away from the original in order to be considered secure.
Bastion Host
A bastion host is a gateway between an inside network and an outside network. Used as a security measure, the bastion host is designed to defend against attacks aimed at the inside network. Depending on a network's complexity and configuration, a single bastion host may stand guard by itself, or be part of a larger computer security system with different layers of protection.