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Which of the following provides nonrepudiation services…

Which of the following provides nonrepudiation services for e-commerce transactions?

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A.
Public key infrastructure (PKI)

B.
Data Encryption Standard (DES)

C.
Message authentication code (MAC)

D.
Personal identification number (PIN)

Explanation:
PKl is the administrative infrastructure for digital certificates and encryption key pairs. The qualities of an
acceptable digital signature are: it is unique to the person using it; it is capable of verification; it is under the sole
control of the person using it; and it is linked to data in such a manner that if data are changed, the digital
signature is invalidated. PKl meets these tests. The Data Encryption Standard (DES) is the most common
private key cryptographic system. DES does not address nonrepudiation. A MAC is a cryptographic value
calculated by passing an entire message through a cipher system. The sender attaches the MAC before
transmission and the receiver recalculates the MAC and compares it to the sent MAC. If the two MACs are not
equal, this indicates that the message has been altered during transmission; it has nothing to do with
nonrepudiation. A PIN is a type of password, a secret number assigned to an individual that, in conjunction with
some other means of identification, serves to verify the authenticity of the individual.


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