TLS
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Each Bank, Corporation, Organisation has their own central system. They can easily switch the encryption of their interfaces in a work day.
Just like with Websites that already do refresh their SSL/TLS certificates with a downtime of less than seconds if at all, thats not a problem.
Their internal systems might be slower to change or upgrade, but since these are not reachable from the outside they are not as endangered as a distributed, completely open system sich as crypto where all parts dont only have to act im unison but also first have to find a consensus of what to do all at the same time, when.

That's weird. Shows me it's TLS.