It's recommended that JIRA is using https protocol.
What is HTTPS?
HTTPS (Hypertext Transfer Protocol Secure) is an internet communication protocol that protects the integrity and confidentiality of data between the user's computer and the site. Users expect a secure and private online experience when using a website. We encourage you to adopt HTTPS in order to protect your users' connections to your website, regardless of the content on the site.
Encryption for Jira can be easily configured. Follow these steps to get started:
The first time you access, the application will request the KEY and IV values that are necessary to encrypt your data.
If you do not have these values, they can be generated by pressing the Generate button.
IMPORTANT: To avoid conflicts it is recommended to save the KEY in a safe place. If you want to change the keys go to the "Change keys" section.
You have the option to show the decrypted custom field values to customers in the customer portal of Jira Service Desk.
To enable this feature please follow the Service Desk menu in the Configuration page.