The mobile operating system must encrypt all data on the mobile device using AES encryption (AES 128 bit encryption key length is the minimum requirement; AES 256 desired).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-32712	WIR-MOS-iOS-65-12	SV-43058r1_rule	DCNR-1	Medium

Description
If data at rest is unencrypted, it is vulnerable to disclosure. Even if the operating system enforces permissions on data access, an adversary can remove non-volatile memory and read it directly, thereby circumventing operating system controls. Encrypting the data ensures that confidentiality is protected even when the operating system is not running. AES encryption with appropriate key lengths provides assurance that the cryptography is adequate.

Description

If data at rest is unencrypted, it is vulnerable to disclosure. Even if the operating system enforces permissions on data access, an adversary can remove non-volatile memory and read it directly, thereby circumventing operating system controls. Encrypting the data ensures that confidentiality is protected even when the operating system is not running. AES encryption with appropriate key lengths provides assurance that the cryptography is adequate.

STIG	Date
Apple iOS 5 Security Technical Implementation Guide (STIG)	2012-07-20

Details

Check Text ( C-41073r1_chk )
Review system documentation and operating system configuration to verify the operating system encrypts all data using AES encryption. Validate this includes data on removable memory, such as SD cards. If the operating system does not encrypt data at rest, or does so only selectively, or does so using an encryption algorithm other than AES (for unclassified data), this is a finding.

Fix Text (F-36608r1_fix)
Configure the operating system to encrypt all data on the mobile device using AES encryption.