Pheromodem
From Mushpedia
Pheromodem
With this piece of research, humans can access and communicate in the 
Mush channel. However, everybody's names are obfuscated and they appear as "mush" to each other. This does not apply to the Mush themselves, who see everybody's real names.
When messages about infections appear in the channel, the names of the participants will be replaced by scrambled letters, with no clues to their identity except the time at which it happened.
