It provides a unique digital fingerprint of the data, which can be compared at the receiving end to verify that the data has not been altered during transmission. Even a small change in the data will result in a significantly different hash value, making it an effective method for ensuring data integrity.
CISA RM 27th edition, page 737
D
A message digest is a cryptographically strong, one-way hash function of the message. It is similar to a checksum in that it compactly represents the message and is used to detect changes in the message. The message digest authenticates the user’s message in such a way that if it were altered, the message would be considered corrupted.
D is correct. (Digest = Hash) Page 300 from Cisa Study Guide: Such function can be used to augument encryption schemes with integrity and authenticity properties. Hashing algorithms are an accurate integrity check tool.
The option that would MOST effectively ensure the integrity of data transmitted over a network is A. Message encryption.
Message encryption involves encoding data using cryptographic algorithms, making it unreadable to unauthorized individuals. By encrypting the data, it ensures that the integrity of the transmitted information is maintained. Any unauthorized modification or tampering with the data during transmission would render it unreadable and unusable to unauthorized parties.
A message digest (option D) is a hash value generated from the data, which can be used to verify the integrity of the message. However, on its own, a message digest does not protect the data during transmission. It can be used alongside other mechanisms, such as message authentication codes (MAC), to provide both integrity and authentication.
, message encryption would MOST effectively ensure the integrity of data transmitted over a network. Message encryption involves the process of converting plaintext into ciphertext using an algorithm and a secret key.
Encryption will assure the data confidentiality, but hashing will assure that message hasn't been altered during its transmission.
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