RoboForm data is encrypted across all devices, including iOS devices.
To protect against dictionary, brute force, or other attacks, we use AES256 bit encryption with PBKDF2 SHA256, 4096 iterations. PBKDF2 is a key stretching algorithm used to hash passwords with a salt.
All decryption of your RoboForm data happens on your device and not on our servers. No RoboForm data can be accessed without the Master Password, and we do not transmit your Master Password to our servers.