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Question 323 - CAS-004 discussion

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An administrator at a software development company would like to protect the integrity of the company's applications with digital signatures. The developers report that the signing process keeps failing on all applications. The same key pair used for signing, however, is working properly on the website, is valid, and is issued by a trusted CA. Which of the following is MOST likely the cause of the signature failing?

A.
The NTP server is set incorrectly for the developers
Answers
A.
The NTP server is set incorrectly for the developers
B.
The CA has included the certificate in its CRL.
Answers
B.
The CA has included the certificate in its CRL.
C.
The certificate is set for the wrong key usage.
Answers
C.
The certificate is set for the wrong key usage.
D.
Each application is missing a SAN or wildcard entry on the certificate
Answers
D.
Each application is missing a SAN or wildcard entry on the certificate
Suggested answer: C

Explanation:

The most likely cause of the signature failing is that the certificate is set for the wrong key usage. Key usage is an extension of a certificate that defines the purpose and functionality of the public key contained in the certificate. Key usage can include digital signature, key encipherment, data encipherment, certificate signing, and others. If the certificate is set for a different key usage than digital signature, it will not be able to sign the applications properly. The administrator should check the key usage extension of the certificate and make sure it matches the intended purpose. Verified

Reference:

https://www.wintips.org/how-to-fix-windows-cannot-verify-the-digital-signature-for-this-file-error-in-windows-8-7-vista/

https://softwaretested.com/mac/how-to-fix-a-digital-signature-error-on-windows-10/

https://support.microsoft.com/en-us/office/digital-signatures-and-certificates-8186cd15-e7ac-4a16-8597-22bd163e8e96

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asked 02/10/2024
Marcelo Rubio Caiado
44 questions
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