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Fix HKDF rationale

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Travis Ralston 2019-06-11 11:31:24 -06:00
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specification/modules/end_to_end_encryption.rst
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@ -671,6 +671,7 @@ parameter is the concatenation of:
* The ``transaction_id`` being used.
.. admonition:: Rationale
HKDF is used over the plain shared secret as it results in a harder attack
as well as more uniform data to work with.