Who first described the DoD multilevel military security policy in abstract, formal terms?
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A. B. C. D.A.
It was David Bell and Leonard LaPadula who, in 1973, first described the DoD multilevel military security policy in abstract, formal terms.
The Bell-LaPadula is a Mandatory Access Control (MAC) model concerned with confidentiality.
Rivest, Shamir and Adleman (RSA) developed the RSA encryption algorithm.
Whitfield Diffie and Martin Hellman published the Diffie-Hellman key agreement algorithm in 1976
David Clark and David Wilson developed the Clark-Wilson integrity model, more appropriate for security in commercial activities.
Source: RUSSEL, Deborah & GANGEMI, G.T.
Sr., Computer Security Basics, O'Reilly, July 1992 (pages 78,109).
The correct answer is A. David Bell and Leonard LaPadula.
David Bell and Leonard LaPadula first described the Department of Defense (DoD) multilevel military security policy in abstract, formal terms in a technical report titled "Secure Computer Systems: Mathematical Foundations." This report was published in 1973 and presented a mathematical model for secure computer systems. The Bell-LaPadula model is a formal model for computer security policy that deals with the confidentiality of information. The model uses two security properties: confidentiality and integrity. It defines a set of rules and guidelines that ensure the confidentiality of classified information at different levels of security clearance.
The other options listed in the question are related to different areas of cryptography and computer science.
Rivest, Shamir, and Adleman are the inventors of the RSA encryption algorithm, which is widely used in public-key cryptography.
Whitfield Diffie and Martin Hellman are the inventors of the Diffie-Hellman key exchange protocol, which is also used in public-key cryptography.
David Clark and David Wilson are computer scientists who made contributions to the development of the Internet and its protocols.