Conventional security mechanisms such as access control and encryption
do not directly address the enforcement of information-flow policies.
Semantics-based models are suitable for describing end-to-end policies
such as noninterference and its extensions.
The talk is a survey based on the article by Sabelfeld et. al. from 2003,
and others.
The goal of the talk is to introduce the general idea of semantics-based
security, discuss the computability-theoretic aspect, and show different
security goals to which this model is applicable.