There are many conferences, let's take example cryptography. I assume it makes a difference if you publish at a good conference as compared to a bad conference. The question is then: how do I find good conferences? How do I guess from web site if it is a good conference. For example in cryptography Asiacrypt is one of the best. Let's say level A. Let's say I want to publish in a lower rank conference say level B, but not level C.
How do I find conferences from level B?