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which of the following will help verify that the instruction was not duplicated?

When transmitting a payment instruction, which of the following will help verify that the instruction
was not duplicated?

PrepAway - Latest Free Exam Questions & Answers

A.
Use of a cryptographic hashing algorithm

B.
Enciphering the message digest

C.
Deciphering the message digest

D.
A sequence number and time stamp

Explanation:

When transmitting data, a sequence number and/or time stamp built into the message to make it
unique can be checked by the recipient to ensure that the message was not intercepted and
replayed. This is known as replay protection, and could be used toverify that a payment instruction

was not duplicated. Use of a cryptographic hashing algorithm against the entire message helps
achieve data integrity. Enciphering the message digest using the sender’s private key, which signs
the sender’s digital signature to the document, helps in authenticating the transaction. When the
message is deciphered by the receiver using the sender’s public key, it ensures that the message
could only have come from the sender. This process of sender authentication achieves
nonrepudiation.


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