When getting started, we recommend that you encrypt all attachments in your JIRA instance.
After generating and saving your keys, a message asks you to encrypt all your existing attachments. If you click "Encrypt now", a process will be launched in the background to encrypt all attachments.
If you select "Encrypt later", no attachments will be encrypted until you go to the configuration page and apply a security scheme.
The outcome of Encryption is that the attachments will no longer be readable by accessing them directly from the server file system.
By default, all attachments will be encrypted. So if this is your desired behaviour just disable the Security Schemes button.
This way, all existing attachments and the new ones will be encrypted.
The Project Level Encryption for Attachments menu can be found under Add-ons → ENCRYPTION FOR JIRA → Configuration.
Select the encrypted projects
If you want to select only specific project attachments to be encrypted, please enable the Security Schemes button and select the wanted projects.
The selection can be done in a basic way using the box above the "Save" button, or in an advanced way clicking on the button.
If you need to decrypt all your attachments for all projects:
The outcome of Decryption is that the attachments will be again readable by accessing them directly from the server file system.