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A comment on Confidential VMs. Parent comment
Two subtle but important features of these modes are:
1. the tweak is xored both before and after the permutation
2. the tweak is derived from a secret and the address in a secure way
(I don't know if AMD chose such a secure mode, or used some insecure homebrew tweaking scheme)
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Two subtle but important features of these modes are:
1. the tweak is xored both before and after the permutation
2. the tweak is derived from a secret and the address in a secure way
(I don't know if AMD chose such a secure mode, or used some insecure homebrew tweaking scheme)