Security Mechanisms

Table  lists the security mechanisms defined in X.800. The mechanisms are divided into those that are implemented in a specific protocol layer, such as TCP or an application-layer protocol, and those that are not specific to any particular protocol layer or security service.


X.800 distinguishes between reversible encipherment mechanisms and irreversible encipherment mechanisms.A reversible encipherment mechanism is simply an encryption algorithm that allows data to be encrypted and subsequently decrypted. Irreversible encipherment mechanisms include hash algorithms and message authentication codes, which are used in digital signature and message authentication applications.

Table below, indicates the relationship between security services and security mechanisms.


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