Digest
This page should correctly be named "[Digest]"; it is wrong due to technical restrictions.
This section contains a checksum of the data within a map file. It's used to ensure all clients (i.e. players) have the same version of the map. If there's a mismatch in the checksums or the map sizes between the players, the game assumes the maps to be different, and it will transfer the host's map file to the other players.
This section is automatically generated by the Final Alert map editor and all its derivatives. It's usually located at the bottom of the map file.