I think this is called Plumb CFB. It was invented by Colin Plumb back in the day. I first saw it in their FDE products which didn’t have a good IV generation pr

I think this is called Plumb CFB. It was invented by Colin Plumb back in the day. I first saw it in their FDE products which didn’t have a good IV generation process (kind of acting like a replacement for XTS or a wide block cipher) and no, I don’t know what it’s for.