One True Pairing -- usually used to denote a fanatical devotion to one pairing in a fandom, excluding all others; a fandom abbreviation referring to one's favorite fictional couple ("ship")
Open Telecom Platform, standard open-source libraries and tools for Erlang
OTP Bank, Országos Takarékpénztár és Kereskedelmi Bank Nyrt. (National Savings Bank), the biggest commercial bank in Hungary
Outside the Perimeter, an abbreviation sometimes used by Atlantans referring to the suburbs of metro Atlanta
Open telephony platform, a collection of libraries for Erlang.
Over the top, describing something or someone.
Off the page
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On these OTP systems time is an important part of the password algorithm, hence the generation of new passwords based on the current time rather than the previous password or a secret key.
Doing so on an OTP system that is not time-synchronized will cause the client to not be synchronized with the authentication server; the result of this is the added expense of re-issuing new clients.
Mathematical algorithm type OTPs are a good substitute though, especially since many security specialist frown upon the principle Security through obscurity which is often used for the time-synchronized one-time passwords, while the other two types of one-time passwords can and often do rely on cryptographic algorithms that are commonly accepted as secure.
OTP has been produced to provide the same for the virtual world, and to prepare and provide for the introduction of new models of trading made possible by the expanding presence of the virtual world.
The other fundamental ideal of the OTP effort is to produce a definition of these trading events in such a way that no matter where produced, two unfamiliar parties using electronic commerce capabilities to buy and sell that conform to the OTP specifications will be able to complete the business safely and successfully.
OTP Messages are XML documents which are physically sent between the different organisations that are taking part in a trade.