Security
   * An adversary with access to precise enough information about memory
     accesses (typically, an untrusted operating system attacking a secure
     enclave) could recover an RSA private key after observing the victim
     performing a single private-key operation if the window size used for the
     exponentiation was 3 or smaller. Found and reported by Zili KOU,
     Wenjian HE, Sharad Sinha, and Wei ZHANG. See "Cache Side-channel Attacks
     and Defenses of the Sliding Window Algorithm in TEEs" - Design, Automation
     and Test in Europe 2023.