A pictorial representation of a pushbutton on a display screen, which functions as a binary control, for example, on/off. [T1.232-1996]

1. In radio communications systems, pertaining to a station that is transmitting a carrier, whether or not the carrier is modulated.
2. In a radio station, pertaining to a particular source of modulation, such as a specific microphone, that is connected, i.e., is capable of modulating the carrier.

Abbreviation for open network architecture.

Code in which plain text elements and their accompanying code groups are arranged in alphabetical, numerical, or other systematic order, so one listing serves for both encoding and decoding. One-part codes are normally small codes used to pass small volumes of low-sensitivity information. [INFOSEC-99]

Cryptosystem employing key used only once. [INFOSEC-99]

1. [A] manual one-time cryptosystem produced in pad form. [INFOSEC-99]
2. The one time pad is the ONLY encryption scheme that can be proven to be absolutely unbreakable! It is used extensively by spies because it doesn't require any hardware to implement and because of its absolute security. This algorithm requires the generation of many sets of matching encryption keys… (Read More →)

Communication in which information is always transferred in only one preassigned direction.
Note 1: One-way communication is not necessarily constrained to one transmission path.
Note 2: Examples of one-way communications systems include broadcast stations, one-way intercom systems, and wireline news services.

1. A method of encryption used where a requirement exists to prevent the decryption of the cipher text, given full information about the algorithm [CESG].
Note: Often used for encryption of passwords and integrity checksums.
2. Synonym irreversible encryption.

1. A transfer function f which is relatively easy to compute, but for which, for a general value, y , within the selected range, it is computationally difficult to find a value x within the expected domain such that f(x) = y. There may be several values for y , for which finding x is not computationally difficult. [After X.509]… (Read More →)

Synonym simplex operation.