Journal
OPTICS LETTERS
Volume 30, Issue 13, Pages 1644-1646Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.30.001644
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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. (c) 2005 Optical Society of America.
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