Digital Signature Algorithm (DSA)

The asymmetric algorithm that is at the core of the digital signature standard. DSA is a public- key method based on the discrete logarithm problem.

Digital Signature Standard (DSS)

A NIST standard for digital signatures, used to authenticate both a message and the signer. DSS has a security level comparable to RSA (Rivest-Shamir-Adleman) cryptography, having 1,024-bit keys.

Digital Time-Stamp

See Time-Stamp

Directory

The directory is the storage area for network security information such as keys or server names.

DSA

See Digital Signature Algorithm (DSA).

SS/NTP

Symmetricom Secure Network Time Protocol, the protocol created by Symmetricom, based on NTP, that includes additional security features.

DSS

See Digital Signature Standard (DSS)

DTT

Symmetricom Temporal Token

Element Manager (ENMTMS)

Software that manages the components of an application.

Encryption

The transformation of clear data (clear text) into unintelligible data (ciphertext). Asymmetric encryption, also known as Public Key encryption, allows for the trading of information without having to share the key used to encrypt the information. Information is encrypted using the recipient’s public key and then the recipient decrypts the information with their private key. Symmetric encryption, also known as Private Key encryption, allows information to be encrypted and decrypted with the same key. Thus the key must be shared with the decrypting party. Anyone who intercepts the key can also use it.

Ephemeris Time

Time obtained from observing the motion of the moon around the earth.

FIPS

Federal (US) Information Processing Standards are a set of standards for document processing and for working within documents. Some commonly-used FIPS standards are 140-1, 140-2, and 180.

S100 User Guide – Rev. D – June 2005

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Symmetricom S100 manual Dsa, Ss/Ntp, Dss, Dtt, Fips