Natively, Jira is not able to encrypt data such as issues/attachments. Jira does have the ability for you to use issue-level security in order to further restrict users from seeing specific issues and their attachments beyond the scope that the standard permission schemes encompass on a per project basis. But this isn't truly encryption, but rather an addition layer of permissions.
If that avenue is not what you are looking for, then I would recommend searching on our Atlassian Marketplace for Jira apps in relation to encryption.
I hope this helps.
We have just published an app that enables encryption of data in bulk across Jira issues. Check it out here! https://marketplace.atlassian.com/apps/1219237/zorro-anonymizer?hosting=server&tab=overview
What type of encryption are you exactly looking for?
It also depends on which edition you use - server or cloud. In the cloud version, the options for adding low-level features like these are very limited for add-ons.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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