Password-protected file

How it works

The check happens after download. Anyone who fetched the blob has the ciphertext. A weak password falls to a dictionary on that blob. Scanners at the server often cannot see inside.

A client receives contract.zip and the password in a second channel. The unzip works. A colleague who only got the mail cannot open it. The same password sent in the mail makes the ZIP a slow public file.

How it differs

This is not a password-protected link. The link checks before the bytes leave. The file checks after they arrive.

ZIP encryption flavors differ. An old tool may not open AES ZIPs.

Name the tool you tested.

On the ticket

• The practical close is a log line: time, actor, byte count, result.
• Without that line the transfer is a story.
• With it, the next person can see whether this door did what the ticket claimed.
• If the path is shared, say so in the partner profile so a later change does not silently pick a different limit, key, or region.
• On a real ticket, write down the door, the byte count, and the clock.
• For password protected file, that means naming the host or bucket, the expected size, and the time the other side must have a complete file.
• A progress bar is not that record.
• A 200 response that arrives before the complete call is not that record.
• If a retry is allowed, say how many and whether it resumes.
• If a person must approve the send, name the person.
• Partners who receive password protected file files should match on hash or size before they import.
• A same-length corrupt file passes a size check and fails a hash.
• Keep the published hash off the only channel an attacker can edit, or treat it as a corruption check rather than a substitution check.
• When the path changes, new key, new region, new cap, update the profile the same day so the next run does not use a stale limit.