Does this mean the encryption scheme is secure

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Suppose a chosen-ciphertext attacker cannot recover the secret decryption key loran encryption scheme. Does this mean the encryption scheme is secure? Consider a symmetric-key cryptosystem in which cryptographic keys are randomly selected from the set of all n-bit strings. Approximately what should n be in order to provide 128 bits of security against a birthday attack?

Reference no: EM131314803

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