Modeling A Secure Channel
Security definition for a secure channel try to model its properties independently from its concrete instantiation. A good understanding of these properties is needed before designing a secure channel, and before being able to assess its appropriateness of employment in a cryptographic protocol. This is a topic of provable security. A definition of a secure channel that remains secure, even when used in arbitrary cryptographic protocols is an important building block for universally composable cryptography.
A universally composable authenticated channel can be built using digital signatures and a public key infrastructure.
Universally composable confidential channels are known to exist under computational hardness assumptions based on hybrid encryption and a public key infrastructure.
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