https://security.utexas.edu/iso-policies/approved-encryption-methods/handhelds
Approved Encryption Methods for Handhelds | UT Austin Information Security Office
Apple iOS devices Supported devices include the iPhone (3GS or later), iPad, and iPod Touch (3rd generation or later) only, running iOS 4.x or above. Earlier...
encryption methodsfor handheldsut austininformation securityapproved