Encryption is only as strong as the password protecting it. Avoid "123456" or birthdays. Use a passphrase—a random string of words or a complex string of characters. If the password is easy to guess, the encryption is useless.
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If you leave this box unchecked, the contents are locked, but anyone can open the zip file and see the names of the files inside. For example, if you hide a file named Bank_Passwords.txt , a hacker could see that filename, giving them a clue about what is inside. Checking this box hides the filenames entirely until the correct password is entered.