Computing SHA-256 digests is a common and demanding task, particularly in security. A late Intel Mac is shown to be much slower at doing that than M-series Macs, and this considers why that might be.
CryptoKit
Encryption for iMessage has been switching to an improved method to resist quantum attacks. Tahoe and its sisters take the next step, and add quantum-secure encryption for Internet connections.
The Eclectic Light Company 