RFC 1825 (rfc1825) - Page 2 of 22
Security Architecture for the Internet Protocol
Alternative Format: Original Text Document
RFC 1825 Security Architecture for IP August 1995 Non-repudiation The property of a receiver being able to prove that the sender of some data did in fact send the data even though the sender might later desire to deny ever having sent that data. SPI Acronym for "Security Parameters Index". An unstructured opaque index which is used in conjunction with the Destination Address to identify a particular Security Association. Security Association The set of security information relating to a given network connection or set of connections. This is described in detail below. Traffic Analysis The analysis of network traffic flow for the purpose of deducing information that is useful to an adversary. Examples of such information are frequency of transmission, the identities of the conversing parties, sizes of packets, Flow Identifiers used, etc. [Sch94]. 1.2 Requirements Terminology In this document, the words that are used to define the significance of each particular requirement are usually capitalised. These words are: - MUST This word or the adjective "REQUIRED" means that the item is an absolute requirement of the specification. - SHOULD This word or the adjective "RECOMMENDED" means that there might exist valid reasons in particular circumstances to ignore this item, but the full implications should be understood and the case carefully weighed before taking a different course. - MAY This word or the adjective "OPTIONAL" means that this item is truly optional. One vendor might choose to include the item because a particular marketplace requires it or because it enhances the product, for example; another vendor may omit the same item. Atkinson Standards Track
