The best security control for an organization that permits the storage and use of its critical and sensitive information on employee-owned smartphones is establishing the authority to remote wipe. Remote wipe is a feature that allows an authorized administrator or user to remotely erase the data on a device in case of loss, theft, or compromise1. Remote wipe can help prevent unauthorized access or disclosure of the organization's information on employee-owned smartphones, as well as protect the privacy of the employee's personal data. Remote wipe can be implemented through various methods, such as mobile device management (MDM) software, native device features, or third-party applications2. However, remote wipe requires the consent and cooperation of the employee, as well as a clear policy that defines the conditions and procedures for its use. The other options are not the best security controls for an organization that permits the storage and use of its critical and sensitive information on employee-owned smartphones. Developing security awareness training is an important measure to educate employees about the security risks and responsibilities associated with using their own smartphones for work purposes, but it does not provide a technical or physical protection for the data on the devices3. Requiring the backup of the organization's data by the user is a good practice to ensure data availability and recovery in case of device failure or loss, but it does not prevent unauthorized access or disclosure of the data on the devices4. Monitoring how often the smartphone is used is a possible way to detect abnormal or suspicious activities on the devices, but it does not prevent or mitigate the impact of a data breach on the devices. Reference: 4: Mobile Device Backup - NIST 3: Security Awareness Training - NIST 1: Remote Wipe - Lifewire 2: How Businesses with a BYOD Policy Can Secure Employee Devices - IBM : Mobile Device Security Policy - SANS

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There should be documented standards-procedures for the use of cryptography across the enterprise; they should define the circumstances where cryptography should be used. They should cover the selection of cryptographic algorithms and key lengths, but not define them precisely, and they should address the handling of cryptographic keys. However, this is secondary to how and when cryptography should be used. The use of cryptographic solutions should be addressed but, again, this is a secondary consideration.