Physical Cryptography: A New Approach to Key Generation and Direct Encryption
Final rept. 1 Jun 2006-31 Jul 2009
NORTHWESTERN UNIV EVANSTON IL DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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The security of key generation and direct encryption in quantum and physical cryptography have been investigated. It is found that similar to the situation of conventional mathematics based cryptography, fundamental and meaningful security levels for either the data bits or the cipher seedkey bits have not been quantified for any concrete cipher except the one-time pad. Attempts were made in our study to rectify the situation, especially for the alpha eta cryptosystem and the more powerful and complicated CPPM cryptosystem. Some success can be obtained under certain assumptions such as the attacks inability to entangle across many modes which are quite realistic, and the availability of unlimited bandwidth to the user which are not. It is concluded that much further effort is required for meaningful security quantification in concrete cryptosystem of any quantum or classical variety.
- Electrical and Electronic Equipment