Twitter 上看到這篇，講 Intel 推出新的指令集，對 AES 的加速效果：
#ePrint Making AES great again: the forthcoming vectorized AES instruction: N Drucker, S Gueron https://t.co/kM0u6XHv3e
— IACR (@IACR_News) May 1, 2018
進去看以後發現是講四月推出的 Ice Lake，在上面新增的 VPCLMULQDQ 指令對效能的幫助：
The introduction of the processor instructions AES-NI and VPCLMULQDQ, that are designed for speeding up encryption, and their continual performance improvements through processor generations, has significantly reduced the costs of encryption overheads.
而他們發表出來的數據說 AES-GCM 的效率直接從 ~23 cycles/byte 降到 0.64 cycles/byte，大約是 35 倍的改進？
More and more applications and platforms encrypt all of their data and traffic. As an example, we note the world wide proliferation of the use of AES-GCM, with performance dropping down to 0.64 cycles per byte (from ~23 before the instructions), on the latest Intel processors.
就算不是 AES-GCM，而是其他的 AES 相關演算法，也是三倍以上的改善：
這效能差異...