If we were somehow able to liquidate the net worth of every billionaire in the US without any losses it might just about cover UBI, $1000/month for every adult, for one year. How are you planning to fund it for every year after the first.
Using american-english dictionary from aspell [1] and filtering for lines that only contain lower case letters [2] gives you 77649 words. For four words that gives approx 64 bits of entropy [3].
[1] Probably available on a Linux system at /usr/share/dict/american-english
According to the article there is currently nothing that can be done for simplesamlphp. You could open an issue on Github for it.
> SimpleSAMLphp’s IDP supports key rollover but no way to specify unique keys for individual service providers. There might be a way to configure it but if so, it’s not mentioned in the documention and I’m not excited to try it myself.