CISA-KR 문제 576
CISA-KR 문제 577
A characteristic of a digital signature is that it is unique to the message. This means that a digital signature cannot be copied from one document to another without being detected as invalid. A digital signature is created by applying a mathematical function called a hashing algorithm to the document. A hashing algorithm produces a fixed-length output called a hash or digest from any input data. The hash is unique to the input data; any change in the input data will result in a different hash.
The signer then encrypts the hash with their private key (a secret key that only they know) to create the digital signature. The encrypted hash is attached to the document as the digital signature. The recipient of the document can verify the digital signature by decrypting it with the signer's public key (a key that is publicly available and matches the private key) to obtain the hash. The recipient then applies the same hashing algorithm to the document to generate another hash. The recipient then compares the two hashes; if they match, it means that the document has not been altered and that the signer is authentic.
Therefore, a digital signature is unique to the message because it is derived from the hash of the message, which is unique to the message.
References:
7: Free Online Signature Generator (Type or Draw) | Signaturely
8: What are digital signatures and certificates? | Acrobat Sign - Adobe
9: eSign PDF with Electronic Signature Free Online - Smallpdf
CISA-KR 문제 578
CISA-KR 문제 579
Addressing the overall risk associated with the activity under review, ensuring maximum use of audit resources during the engagement and prioritizing and scheduling auditee meetings are also purposes of documenting audit objectives, but they are not as primary as identifying areas with high probability of material problems. References:
CISA Review Manual, 27th Edition, page 1111
CISA Review Questions, Answers and Explanations Database - 12 Month Subscription
CISA-KR 문제 580
This can help to determine the appropriate level of protection and security measures that need to be applied to each asset. A complete and accurate list of information assets can also help to track and monitor the location, status, ownership, usage, configuration, maintenance, etc., of each asset. This can help to prevent or detect any unauthorized or inappropriate changes or movements of assets that may compromise their security or integrity. Segregation of duties between staff ordering and staff receiving information assets, availability and testing of onsite backup generators, and knowledge of the IT staff regarding data protection requirements are also important prerequisites for the protection of physical information assets in a data center, but not as important as a complete and accurate list of information assets that have been deployed. These factors are more related to the implementation and maintenance of security controls and procedures that depend on having a complete and accurate list of information assets as a starting point. References: ISACA CISA Review Manual 27th Edition, page 308
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