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In this list, you will find explanations of some terms frequently used in connection with Information Security. These will be explained in as simple terms as possible.

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Transaction number (TAN)

TAN (transaction number) is a one-off password which is used in addition to a password or PIN. There are different ways of notifying customers of a TAN. The best-known method is a mobile TAN (mTAN), which financial institutions send to customers by SMS.

Transmission Control Protocol (TCP)

A protocol which controls the distribution of data amongst packets and the recipient-side assembly, and safeguards checking the complete transmission of these data.

Transmission Control Protocol/Internet Protocol (TCP/IP)

This is a protocol suite comprising the underlying communication protocols of the Internet. These are also frequently used inside private networks.

Transport Layer Security (TLS)

TLS is a successor standard by SSL. TLS resolves some errors which were contained in SSL.


Malware disguising itself as something useful or a game, however with completely different objectives in reality. Trojans can for instance capture, change or delete passwords or other confidential data, or transmit them to an attacker.

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