Why iMessage generate a lot of Encryption and Signing keys?

First of all I don`t use iMessage. I log out of iMessage on my iDevices.

Today I took a look of my login Keychain Access and there were 366 items. All of them were iMessage Encryption Key and iMessage Signing Key.

I delete it, reboot my Mac and open Keychain Access again. In the reboot 8 keys (see screenshot) were create. Is this behaviour normal?

There is no problem in deleting those. Just close your messages app, remove all of those from keychain and reboot your mac. It will create a fresh pair for use.

PS: Log in and use it! It is one of the most secure IM services in the world, works seamlessly and allows you to send SMS from your mac.