To affix a digital signature to a message, the sender must
first create a message digest by applying a cryptographic
hashing algorithm against:
A. the entire message and thereafter enciphering the message
digest using the sender's private key.
B. any arbitrary part of the message and thereafter
enciphering the message digest using the sender's private key.
C. the entire message and thereafter enciphering the message
using the sender's private key.
D. the entire message and thereafter enciphering the message
along with the message digest using the sender's private key.
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Answer: A
A digital signature is a cryptographic method that ensures
data integrity, authentication of the message, and
non-repudiation. To ensure these, the sender first creates a
message digest by applying a cryptographic hashing algorithm
against the entire message and thereafter enciphers the
message digest using the sender's private key. A message
digest is created by applying a cryptographic hashing
algorithm against the entire message not on any arbitrary
part of the message. After creating the message digest, only
the message digest is enciphered using the sender's private
key, not the message.
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