I was reading a paper of some years ago about a cryptography and a phrase got my attention.
We want to ensure a security level of at least $2^{80}$
I know that $2^{80}$ was used as rule of thumb rule, that's probably why they wrote that sentence.
But reading this I think that $2^{100}$ may also be too low. Considering for example the resource that a state like US can have what is a reasonable security level?
EDIT: I'm considering only the security level for a bruteforce attack, other algorithm can have a solution that require less computational force.