The mobile operating system must encrypt all data in transit using AES encryption when communicating with DoD information resources (128-bit key length is the minimum requirement; 256-bit desired).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-32704	WIR-MOS-iOS-65-06	SV-43050r1_rule	DCNR-1	Medium

Description
If data traffic is sent unencrypted, an adversary may be able to read it to obtain sensitive information. AES encryption with 128-bit (or longer) keys mitigates the risk of unauthorized eavesdropping. This requirement applies to both VPN connections and DoD messaging connections (email and authorized instant messaging applications).

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

Details

Check Text ( C-41067r1_chk )
Review the operating system documentation and configuration (and possibly application configuration) to determine if the system uses AES encryption with at least 128-bit keys. If it does not use AES encryption with the required key length, this is a finding.

Fix Text (F-36602r1_fix)
Configure the VPN client, email client, and other applications that communicate with DoD information resources to use AES encryption with 128-bit (or longer) keys.