Question: cryptography/security engineering Consider a general symmetric-key cryptosystem, With the usual notations: E: Encryption algorithm - D: Encryption algorithm - k: cryptographic key - mis message

cryptography/security engineering

Consider a general symmetric-key cryptosystem, With the usual notations: E: Encryption algorithm - D: Encryption algorithm - k: cryptographic key - mis message (plaintext) - ciciphertext Now deterine which one of the following statements has to be true in general. Select one: a. EA(n)=E4(n)if n=m b. EB(B)=Ek(m) if kk c. Dk(c)=Dk(c) if c=cn and k=k d. E1(Dk(m))=m for all m e. Ek(m)=Ek(m) if mm and k=k

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