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.
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.
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
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