$15.$ Which statements on classical cryptography fundamentals are correct

A)$)$ The encryption function in the RSA cipher is simply only an exponentiation ($($by the e component of the public key)$)$ modulo n,$,$ while the decryption function is exponentiation with a different exponent, namely d constituting the private key used for decryption.

B)$)$ In asymmetric cryptography the relationship between the public key and private key is asymmetric, so for the encryption it is easy to compute a private key from the public key, while the opposite operation is difficult.

C)$)$ In breaking DES cryptosystem differential cryptanalysis is more efficient than linear cryptanalysis.

D)$)$ An encryption scheme is deterministic if a particular plaintext is mapped to the same ciphertext when the key used has not been changed.

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