FPGAs Eyed for Sub-Millisecond Crypto Offload
FPGAs are gaining traction for offloading cryptographic algorithms to hardware for ultra-low latency. An FPGA designer recently highlighted a Verilog implementation of AES-128, showcasing how these devices can provide sub-millisecond crypto performance needed for securing modern trading infrastructure.
The primary advantage of FPGAs in trading isn't just raw speed, but deterministic latency. Unlike CPUs, which are subject to interrupts and context switching, an FPGA provides a predictable, cycle-accurate response time for every operation, which is critical for risk management and consistent algorithm performance. This eliminates "long-tail" latency spikes that can occur in software during high market volume. Hardware-based AES encryption on an FPGA can be over 28 times faster than a software equivalent running on a general-purpose CPU. One study demonstrated encryption times of 390 nanoseconds on an FPGA compared to 11 microseconds in software. This performance gap stems from the parallel architecture of FPGAs, which allows multiple stages of the encryption algorithm to run simultaneously. This hardware offload is not limited to a single cryptographic function. Firms often place an entire chain of operations onto the FPGA, including TCP/IP stack processing, FIX message validation, and SEC-mandated pre-trade risk checks. This "bump-in-the-wire" approach allows an incoming market data packet to be received, parsed, filtered, and acted upon, with an outbound encrypted order sent in a single, sub-microsecond pass through the chip. FPGA-based acceleration is a complementary technology to kernel bypass techniques like DPDK or Onload. While kernel bypass accelerates the movement of network packets to the application, the FPGA handles the application logic itself—such as risk checks and encryption—in hardware. This combination creates an end-to-end path from the network wire to an outbound order that completely avoids the server's CPU and operating system. Leading proprietary trading firms and market makers have long adopted FPGAs for market data processing and order execution. Major technology providers like AMD (through its Xilinx acquisition) and Intel, along with specialized firms such as Algo-Logic, now offer accelerator cards and IP cores tailored specifically for financial use cases, including pre-trade risk solutions that operate in under a microsecond.
