A technician downloads a validated security tool and notes the vendor hash of a58e87a2. When the download is complete, the technician again validates the hash, but the value returns as 2a876a7d3…

Private-browsing mode affects browser history and cookies but does not alter the content of downloaded files or their cryptographic hashes.

An invalid certificate would typically prevent the download from starting securely or would issue a warning before the download, but it wouldn't change the file's hash after it has been downloaded.

A cryptographic hash is a unique digital fingerprint of a file; if the hash value changes, it means the file's contents have been modified in some way, even if subtle. This modification could indicate tampering, corruption, or an incomplete download, making 'Modified file' the most likely cause for the hash mismatch.

Browser cache stores copies of web pages and files to speed up browsing, but it does not change the cryptographic hash of a downloaded file's content.