Based upon both market trends and device usage on campus, the ISO has opted to provide recommendations for encrypting Apple, Blackberry, and Android based handheld devices.
Apple iOS devices
Supported devices include the iPhone 3GS, iPhone 4, iPad, and iPod Touch (3rd generation or later) only, running iOS 4.x. Earlier versions of the hardware and operating system software do not support key security features, such as hardware encryption.
The only approved encryption method for iOS devices at this time is the built-in whole disk encryption that is provided with iOS 4 running on a supported device combined with data protectionhttp://support.apple.com/kb/HT4175. Data protection allows the hardware encryption keys to be protected with the user's passcode. Without this, the encryption could be defeated with a simple jailbreak.
To verify that data protection is enabled:
1. Tap Settings.
2. Tap General.
3. Tap Passcode.
4. "Data protection is enabled" should be displayed at the bottom of the screen.
If data protection is not enabled, enable it by setting a passcode on the device.
Note: if the device originally shipped with iOS 3 (e.g. the iPhone 3GS, iPad, and iPod Touch), this feature will not be available until the device is restored after upgrading to iOS 4. This feature is not available on older devices, such as the iPhone 3G and earlier models, at all, as they do not support hardware encryption.
More information regarding this feature is available on Apple's site at iOS 4: Understanding data protection.