Naming a service that encrypts data

There is a service contract to take some class object to serialize and encr开发者_开发问答ypt it IService. What is the best name for the service implementation that does not implement any encryption?

IService
TwofishService
AESService     
RC4Service
...
NoEncryptionService???

I really doubt that matters as much as to have some "convention". NoEncryption sounds good enough.