### Encrypted area packet ¶

Multicast areas area messages contains the encrypted packet, that is completely similar and have the same format as an ordinary encrypted packet. But instead of the node’s identity, area’s identity is used as a recipient.

For example when `nodeA` sends multicast packet with file transmission and `nodeB` is the area’s subscriber, then `nodeA` has an encrypted packet to the `nodeB` in the outgoing spool directory:

    ENCRYPTED PACKET (sender=nodeA, recipient=nodeB) WRAPS
      PLAIN PACKET (type=area, path=AREA ID) WRAPS
        ENCRYPTED PACKET (sender=nodeA, recipient=AREA) WRAPS  <-- MsgHash
          PLAIN PACKET (type=file, path=FILENAME) WRAPS
            FILE CONTENTS

Area’s message identity is the BLAKE2b-256 hash of header of the area’s packet encrypted packet.