The first rule of computer security is to check ___________

The discussion of base/bounds registers implies that program code is execute-only, and data areas are read-write-only. Is this ever not the case? Explain your answer

What will be an ideal response?

Which of the following statements about symmetric key cryptography is not true?

A) Symmetric key cryptography uses one shared key. B) Symmetric algorithms can provide confidentiality. C) Symmetric algorithms can provide nonrepudiation and authenticity. D) Symmetric key cryptography uses a single secret key.