‘ Secret Calculator Photo Vault: Hide Keep Safe Lock’ uses ‘ Military Grade Encryption AES-256 bit‘ to keep files safe within the application.
Manual examination is always the bare minimum aim with this type of application but given the opportunity we want the files decrypted so we can better interact with the them and potentially gain more information. Luckily, the investigator already had the PIN to the application and could manually view the files. Recently I assisted with a request to decrypt data stored in one such application.
Calculator applications that store more than you think on the face value are becoming more common.