How to Verify Software Origin and Publisher Identity?

A company wants to verify that the software the company is deploying came from the vendor the company purchased the software from. Which of the following is the best way for the company to confirm this information?

  1. Validate the code signature. Source Reference Answer
  2. Execute the code in a sandbox.
  3. Search the executable for ASCII strings.
  4. Generate a hash of the files.

Community Votes

A
100%

100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.

Community Insight

This question tests the critical distinction between data integrity and source authentication, with the common trap being the selection of hashing algorithms that verify tampering but not publisher identity.

Code signing leverages public key infrastructure to authenticate software publishers and ensure file integrity. The technical community unanimously agrees that validating a code signature is the definitive method for confirming vendor origin.

Candidates frequently select option D (Generate a hash) because while hashing guarantees the file content remains unchanged, it provides zero cryptographic proof of the creator or vendor.

Community Discussion (3 comments)

a4e15bd 👍 9
A. Validate the code signature Code signing is a process where the software vendor signs the executable code with a digital certificate. This certificate verifies the identity of the software vendor and ensures that the code has not been altered with since it was signed. By validating the code signature, the company can confirm the authenticity and integrity of the software.
ProudFather 👍 1 Selected: A
A code signature is a digital signature that verifies the authenticity and integrity of software. By validating the code signature, the company can confirm that the software came from the intended vendor and has not been tampered with.
nillie 👍 3 Selected: A
The best way for the company to confirm that the software came from the vendor is: A. Validate the code signature. Code signing uses digital signatures to confirm the identity of the software publisher and ensure that the code has not been altered since it was signed. By validating the code signature, the company can verify that the software is authentic and comes from the trusted vendor.

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Expert Analysis

Why the Answer Is Correct

Validating a code signature directly satisfies the requirement to confirm software origin. Code signing utilizes asymmetric cryptography and trusted Certificate Authorities to cryptographically bind a developer's verified identity to the binary. When a system validates the signature, it proves the software was issued by the claimed vendor and has not been altered since signing.

Why the Other Options Are Wrong

Executing code in a sandbox isolates potentially malicious software for behavioral analysis but does not verify its source or authorship. Searching for ASCII strings is a static reverse-engineering technique used to extract hardcoded data, offering no authentication capabilities. Generating a hash only confirms file integrity; an attacker could easily replace legitimate software and generate a new hash for their own payload.

Community Comment Notes

The community overwhelmingly supports option A, emphasizing that code signing explicitly verifies both authenticity and integrity. Commenters [1] and [2] correctly highlight that digital certificates anchor the vendor's identity within a broader PKI framework. Comment [3] succinctly captures the dual purpose of code signatures, reinforcing why it outperforms hashing for origin verification.

Official Reference

Exam Strategy

Always differentiate between integrity mechanisms (hashes) and authentication mechanisms (digital signatures) when exam questions ask about verifying a file's source or publisher. Look for keywords like "vendor," "publisher," "origin," or "authenticity" to immediately rule out hashing and point toward certificate-based solutions.

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