Talk:Services/Sync/SimplifiedCrypto
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sync key representation
The sync key is represented to the user as:
X-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Deriving encryption and HMAC keys from the Sync Key
The hmac used is an SHA-256 HMAC.
(A deep link to Utils.makeHMACKey() would be helpful here.)