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ISACA Certified Information Systems Auditor · Isaca
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Digital signatures are primarily used to verify the identity of the sender of a message and to ensure that the message has not been tampered with during transmission.
Look at CISA Review Manual 27th Edition page 613 question 5-8 Which of the following concerns about the security of an electronic message would be addressed by digital signatures? A. Unauthorized reading B. Theft C. Unauthorized copying D. Alteration ANSWER: D “A digital signature includes an encrypted hash total of the size of the message as it was transmitted by its originator. This hash would no longer be accurate if the message was altered subsequently, indicating that the alternation had occurred.” Page 616