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bases (a public basis and a private basis) is associated to every user, the OCDMA code-words are projected on a public basis before being sent so that only the user possessing the corresponding private basis can decrypt the keyword. We show that the projection of a codeword on the public basis of the receiver and the
This paper analyzes the meaning and significance of key authentic degree of cryptosystem under the threat of the rubber-hose attack and ciphertext only attack. A novel cryptosystem of low key authentic degree is designed. The inner encryption is an extension like multiple-choice questions with keywords similar and
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