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3.1.4.5.1 Encryption Key

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An encryption key is generated when a homegroup is created. The key is formed as specified in the description for the EncodedKeyBlob structure (step 2) in section 2.2.2.2.5.

This encryption key is used to encrypt the HomeGroup Credentials message (section 2.2.2.2.1) account credentials, as well as the public/private signing keys, before sending over the network.