Just Tarex teams and Mossad by themselves would be a big threat. NSA has the visibility to de-anonymize even some people on Tor. Most mathematicians aren't exactly computer security geniuses. NSA might not even need to work that hard. Then, they have plenty of partners for grabbing whoever or whatever the target is.

https://theintercept.com/2014/10/10/core-secrets/

You don't have to keep it private after 2/3 months. Just make the algorithm public and no one will kidnap you.