ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question
During threat modeling of a healthcare mobile app, the team worries that an attacker who steals an end-user's phone could read locally cached patient records. Which design choice best enforces confidentiality of those records if the device falls into unauthorized hands?
Encrypt the local database with AES-256 and protect the key in the mobile OS keystore.
Calculate a SHA-256 hash of each record and store it alongside the data.
Replicate the database to a standby server in another region every hour.
Require administrators to use multi-factor authentication when logging into the back-end portal.
Confidentiality is the principle of preventing unauthorized disclosure of information. Encrypting the local database with a strong algorithm such as AES-256 renders the data unreadable without the decryption key, directly addressing the risk that a thief could view patient records. A SHA-256 hash only detects later alterations and therefore supports integrity, not confidentiality. Geographic replication improves availability but does nothing to hide data from an unauthorized viewer. Multi-factor authentication on the administrator portal adds an access barrier for admins, yet it does not protect data already stored on a stolen device.
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What is AES-256 encryption, and why is it used in mobile app security?
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What is a mobile OS keystore, and how does it secure encryption keys?
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How does encrypting the local database directly address confidentiality?
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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
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