Does anyone know what the cryptography behind MS Double key encryption is ? https://learn.microsoft.com/en-us/purview/double-key-encryption-overview. I find the wording extremely confusing. I would expect encapsulation of an ephemeral key encrypting the document but it says MS keeps one key. Is it as expected the wrapped ephemeral key ? Or is it a scheme where 2 keys are combined using XOR or some other mechanism ? I cannot find any detail. #cryptography #microsoft