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[Translating] How to verify the authenticity and integrity of a downloaded file on Linux

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sources/tech/20141017 How to verify the authenticity and integrity of a downloaded file on Linux.md
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Translating----geekpi
How to verify the authenticity and integrity of a downloaded file on Linux
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When you download a file (e.g., an installer, an ISO image, or a compressed archive) from the web, the file can be corrupted under a variety of error conditions, e.g., due to transmission errors on the wire, interrupted download, faulty storage hardware, file system errors, etc. Such failure cases aside, a file can also be deliberately tampered with by determined attackers during or before download. For example, an attacker with a compromised certificate authority could mount a man-in-the-middle (MITM) attack, tricking you into downloading a malware-ridden file from a bogus HTTPS website.