Elements of information theory
Elements of information theory
Claude Elwood Shannon: collected papers
Claude Elwood Shannon: collected papers
Performance Study of a Selective Encryption Scheme for the Security of Networked, Real-Time Video
ICCCN '95 Proceedings of the 4th International Conference on Computer Communications and Networks
MMSD '96 Proceedings of the 1996 International Workshop on Multimedia Software Development (MMSD '96)
Ciphers and their products: group theory in private key cryptography
Ciphers and their products: group theory in private key cryptography
Complete Guide to Security and Privacy Metrics
Complete Guide to Security and Privacy Metrics
Security Metrics: Replacing Fear, Uncertainty, and Doubt
Security Metrics: Replacing Fear, Uncertainty, and Doubt
Quantified security is a weak hypothesis: a critical survey of results and assumptions
NSPW '09 Proceedings of the 2009 workshop on New security paradigms workshop
An inequality on guessing and its application to sequential decoding
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Entropy of selectively encrypted strings
WISTP'11 Proceedings of the 5th IFIP WG 11.2 international conference on Information security theory and practice: security and privacy of mobile devices in wireless communication
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To be able to perform an analytical and more exact description of security, quantitative security measures are desirable. Two proposed quantitative security measures are entropy and guesswork. When breaking an encrypted message, entropy measures the average number of guesses in an optimal binary search attack, whereas guesswork measures the average number of guesses in an optimal linear search attack. In this paper, we continue to investigate the security implications of a generic selective encryption procedure. That is, how entropy and guesswork changes with the number of encrypted units, i.e., the encryption level. This is done for languages up to the second order by deriving equations for entropy of selectively encrypted messages and then transferring the result to guesswork through an equation relating the two measures. Furthermore, unlike entropy, guesswork does not possess the chain rule, however, through the equation relating entropy and guesswork an equation connecting the different guessworks is derived.