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Printable Version: RFC2828.PDF
RFC 2828 Internet Security Glossary May 2000
$ storage channel
See: (secondary definition under) covert channel.
$ stream cipher
(I) An encryption algorithm that breaks plaintext into a stream of
successive bits (or characters) and encrypts the n-th plaintext
bit with the n-th element of a parallel key stream, thus
converting the plaintext bit stream into a ciphertext bit stream.
[Schn] (See: block cipher.)
$ strong authentication
(I) An authentication process that uses cryptography--particularly
public-key certificates--to verify the identity claimed for an
entity. (See: X.509.)
(O) "Authentication by means of cryptographically derived
credentials." [X509]
$ subject
1. (I) In a computer system: A system entity that causes
information to flow among objects or changes the system state;
technically, a process-domain pair. (See: Bell-LaPadula Model.)
2. (I) Of a certificate: The entity name that is bound to the data
items in a digital certificate, and particularly a name that is
bound to a key value in a public-key certificate.
$ subnetwork
(N) An OSI term for a system of packet relays and connecting links
that implement the lower three protocol layers of the OSIRM to
provide a communication service that interconnects attached end
systems. Usually the relays operate at OSI layer 3 and are all of
the same type (e.g., all X.25 packet switches, or all interface
units in an IEEE 802.3 LAN). (See: gateway, internet, router.)
$ subordinate certification authority (SCA)
(I) A CA whose public-key certificate is issued by another
(superior) CA. (See: certification hierarchy.)
(O) MISSI usage: The fourth-highest (bottom) level of a MISSI
certification hierarchy; a MISSI CA whose public-key certificate
is signed by a MISSI CA rather than by a MISSI PCA. A MISSI SCA is
the administrative authority for a subunit of an organization,
established when it is desirable to organizationally distribute or
decentralize the CA service. The term refers both to that
authoritative office or role, and to the person who fills that
Shirey Informational [Page 166]