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This paper examines the access control requirements of distributed health care information networks. Since the electronic sharing of an individual’s personal health information requires their informed consent, health care information networks need an access control framework that can capture and enforce individual access policies tailored to the specific circumstances of each consumer. Role Based...
Cellular automata provide discrete deterministic mathematical models for physical, biological and computational systems. Despite their simple construction, cellular automata are shown to be capable of complicated behaviour, and to generate complex and random patterns. There have been constant efforts to exploit cellular automata for cryptography since the very beginning of the research on cellular...
In 1998, Cramer and Shoup proposed the first practical and provable cryptosystem against adaptive chosen ciphertext attack under the standard assumption in the standard model, that is, decisional Diffie-Hellman assumption. Recently, Lucks extended the Cramer-Shoup cryptosystem to a group of quadratic residues modulo a composite number and showed that the scheme is provably secure in the standard model...
A system related to the shrinking generator that is made up of two feedback shift registers in which one (FSR $$ \mathbb{A} $$ )) controls the clocking of the other (FSR $$ \mathbb{B} $$ ) is introduced. It is established that if FSR $$ \mathbb{A} $$ ) generates an m-sequence of period (2m − 1) and FSR $$ \mathbb{B} $$ generates a de Bruijn sequence of period 2η, then the output sequence...
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