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The popularity of the BlackBerry in government and enterprises makes on-device encryption a necessity, and the BlackBerry s secure storage options are extremely advanced
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To encrypt sensitive messaging and contact data stored on the BlackBerry, use the BlackBerry s content-protection feature Content protection encrypts data when it is written to flash memory using a key generated from the unlock password Because there would be no way to generate the key without a password, the user is required to specify an unlock password All communication data is encrypted by default, including e-mail, calendar information, browser history, memos, tasks, and SMS messages Users can optionally encrypt the address book, which has the interesting side effect of causing caller ID to not show the name of incoming callers when the device is locked Three keys are used by content protection to protect data (refer to http://nablackberry com/eng/deliverables/3940/file_encryption_STOpdf) There s an ephemeral AES key for unlocking keys, a 256-bit AES key for persistently stored data, and an Elliptical Curve Cryptography (ECC) public/private keypair used for encrypting data when the device is locked The length of the ECC key can be changed in security options and can be up to 571 bits long The ephemeral AES key is generated from the device lock password and is therefore only as strong as the password itself The ECC public key is kept in memory while the device is locked and encrypts all incoming data The public key has to be used because the AES storage key is wiped from memory as soon as the device is locked By only keeping a public key in memory, the BlackBerry protects against attackers who are able to read the device s memory directly When the user unlocks the device with their password, the ephemeral key is used to decrypt the AES storage key and the ECC private key The ECC private key is then used to decrypt all of the data that arrived while the device was locked; before being written to persistent storage this cleartext is encrypted with the AES storage key It is a lot of jumping around, so simply remember this: Data is encrypted with a key that comes from the unlock password, so have a good password! Keys must be held in accessible memory for some period of time if they are going to be used to perform all of these encryption operations The BlackBerry can be configured to scrub sensitive data from memory when the device is locked, holstered, or idle To enable the Memory Cleaner, open Options | Security Options | Memory Cleaning and change the Status setting to Enabled The time window and events that determine when the Memory Cleaner daemon runs can be adjusted, although the
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5: BlackBerry Security
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defaults are probably adequate Also notice the list of registered cleaners The Memory Cleaner system is extensible, and applications can register for memory-cleaning events using the netrimdeviceapimemorycleanerMemoryCleanerDaemon RIM Controlled API Once registered, the application will be alerted whenever the daemon runs and should then clear its memory of any sensitive information When handling encryption keys and other sensitive data, make sure to take advantage of this functionality
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Many BlackBerry devices include memory card slots for storage expansion The smaller these cards physically get, the easier they are to lose, and the more protected they need to be BlackBerry can encrypt documents and media files stored on removable media using the same content protection mechanism as is used on the primary device Not all file types written to the memory card are encrypted, and neither are files written to the card by another source (for example, a computer) There are three modes for protecting external media: Device The BlackBerry uses a cryptographic random number generator to generate the external memory encryption key If the card goes missing, but the device stays in the owner s possession, then anyone who finds the memory card will be unable to read it because the key is still on the device Security Password The user s device password is used to generate an encryption key for the device This is the weakest form of protection because users choose poor passwords and attackers who get the Secure Digital (SD) card can perform offline grinding attacks against the encryption key The grinding attack does not work against the main BlackBerry device password because the device will wipe itself after the specified number of invalid attempts Security Password + Device A combination of the device password and a randomly generated per-device key is used to encrypt the memory card The combination of the two key-generation methods prevents the attacks possible against each one alone
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