This is an Erlang implementation of the [https://github.com/fernet/spec](Fernet specification) which "takes a user-provided message (an arbitrary sequence of bytes), a key (256 bits), and the current time, and produces a token, which contains the message in a form that can't be read or altered without the key."
The all/2 function gives an ordering of all nodes:
1> fernet:generate_token("hello", ""
[{192,198,2,1},{127,0,0,1},{255,0,0,1},{198,2,1,2}]
1> Key = fernet:generate_key().
<<183,88,242,112,75,57,77,51,186,199,75,192,143,226,186,
238,248,154,13,66,136,151,200,66,53,179,25,124,205,...>>
2> fernet:generate_token("hello", Key).
"gAAAAABUePOv15TqGfU53xE8Ve2oK9okoFzRGZB-bzyqZg1kRaclkXPzz6x15I-yHoT1vnhPCd6pdkskwqc5wyDF-wjVMdpauw"