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.

A component which allows the transfer of information from one system to another, whilst providing a high level of confidence that information flow in the reverse direction is prevented [CESG].
Note: Used where the security class of the receiving system dominates that of the sender.

Synonym half-duplex operation.

A trunk between two switching centers, over which traffic may be originated from one preassigned location only.
Note 1: The traffic may consist of two-way communications; the expression "one way" refers only to the origin of the demand for a connection.
Note 2: At the originating end, the one-way trunk is known as an "outgoing trunk"; at the other end,… (Read More →)

A channel capable of transmission in only one direction, which cannot be reversed. Synonym unidirectional channel.