I'm not technically equipped to speak to our cryptographic engineering in great detail, but let me explain.
The concept of cryptography is a concept of exchanging keys. In other words, you need two halves of the key in order to open the compartment of the document, or the “crypt”. The ability for threat vectors to misrepresent the keys or break the keys is constantly evolving, so we have to build better keys, but we can't do that unilaterally or we wouldn't be able to speak to our allies. In working together, we establish the criteria for these evolved keys, and then we go across the global network—the fabric, if you will—and upgrade and update all the hardware and software that generate the keys. It's a very sensitive and complex environment, but it's one we're actually doing really well in, and I would say we're in good shape with respect to our compliancy among our nations.