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.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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