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Vulnerability to chosen-cyphertext attacks of optical encryption schemes based on double random phase keys

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Abstract

We show how optical encryption methods based on double random phase keys are vulnerable to an organized attack of the chosen-ciphertext type. The decryption key can be easily obtained by an opponent who has repeated access to either the encryption or decryption machines. However, we have also devised a solution that prevents the attack. Our results cast doubts on the present security of these techniques.

© 2005 Optical Society of America

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