1 1 . 1 1 . Which of these statements are correct A ) ) In general...
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Which of these statements are correct
A In general cryptographic encryption requires a key to encrypt messages encryption key and a key to decrypt messages decryption key which do not have to be identical, except for the symmetrickey cryptography.
B A pseudo random numbers generator, a hash function or a message authentication code MAC can be built from the block cipher.
C In the RSA cipher for Alice to encrypt the message to Bob, she needs to receive the public key of Bob, which must be sent to her by a reliable, however not necessarily secure communication channel.
D A block cipher can be easily turned into a stream cipher while the opposite is not the case.
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