KB - What does the red "X" indicate when encrypting an archive?

Passphrase

• The red "X" is displayed until the password being entered meets the requirements.
• The default requirement is a passphrase that is eight characters long.
• The user cannot use their own login name as part of the passphrase.

Certificate

A red "X" will be displayed if the certificate is not trusted.  Common reasons would be an expired certificate, a self signed certificate or one where the chain has not been installed.