A data transmission service that is established and operated by a telecommunication administration, or a recognized private operating agency, and uses a public data network.
Note: A public data transmission service may include circuit-switched, packet-switched, and leased-circuit data transmission.

The key, used in an asymmetric algorithm, that is publicly available [10181-1].

1. The type of cryptography in which the encryption process is publicly available and unprotected, but in which a part of the decryption key is protected so that only a party with knowledge of both parts of the decryption process can decrypt the cipher text.
Note: Commonly called non-secret encryption in professional cryptologic circles. FIREFLY is an application of public… (Read More →)

[A] framework established to issue, maintain, and revoke public key certificates accommodating a variety of security technologies, including the use of software. [INFOSEC-99]

See key validation.

A network that is established and operated by an administration or by a recognized operating agency (ROA) for the specific purpose of providing land mobile telecommunications services to the public.
Note: A PLMN may be considered as an extension of a fixed network, e. g. the Public Switched Telephone Network (PSTN) or as an integral part of the PSTN.

The terminating end-point of an emergency service call (for example, E9-1-1) responsible for answering emergency service calls.

1. Any common carrier network that provides circuit switching among public users.
Note: The term is usually applied to public switched telephone networks, but it could be applied more generally to other switched networks, e.g., packet-switched public data networks.
2. A switched network accessible by the public for the purpose of originating and terminating telecommunications messages. [T1.209-1989]
3. Any common… (Read More →)

Those NS/EP telecommunications services utilizing public switched networks.
Note: Public switched NS/EP telecommunication services may include both interexchange and intraexchange network facilities (e.g., switching systems, interoffice trunks, and subscriber loops).

A telecommunications network usually accessed by telephones, key telephone systems, private branch exchange trunks, and data arrangements.
Note: Completion of the circuit between the call originator and call receiver in a PSTN requires network signaling in the form of dial pulses or multi-frequency tones.
The worldwide network of public switched (circuit) telephone networks is based on ITU-T Recommendation E.164 (“The… (Read More →)