HPVES: High Performance Video Encryption Scheme with Cryptographic USB Key

Real time streaming data accounts for a growing proportion of Internet traffic. The demand for security is accordingly increasing, which poses severe burdens on the performance of terminal processing streaming data. In this paper, a high performance video encryption scheme (HPVES) is proposed to speed up cryptographic operations for streaming media data based on cryptographic USB key. In our scheme, the cryptographic key is stored and used in USB key, a dedicated hardware security module (HSM), which avoids the leakage of cryptographic key even when the terminal is compromised. We modify the cos (chip operating system) driver of USB key which is then called HPUK to accelerate data transmission between computer and its' peripherals. A flow control mechanism is also proposed to balance the throughput of keystream and media stream which could (1) make data encryption/decryption maintain at a constant throughput in regardless of the data size and (2) save storage space. We have implemented the proposed scheme and evaluated the performance on different devices. The evaluation demonstrates that HPUK almost doubles the throughput of original USB key on resource-constrained devices at small packet size (no more than 1.5 KB, which suits for real-time UDP transmission). Field experiments also show that HPVES could provide continuous and stable keystream with throughput of 4 MBps.