I have already learned about cryptography. You mean why did I learn about cryptography? Or why would I offer to teach it?
I don’t think its too valuable, but (1) its an aesthetically pleasing field from the theoretical perspective (2) general knowledge of cryptography is likely to lead to better use of cryptography, which is a little valuable (3) general understanding of what it actually means to be paranoid is valuable.
In descending order of expertise:
Cryptography (from a theoretical perspective)
Computational Complexity theory (particularly, proof systems)
Algorithms / Data Structures
Quantum computing (particularly quantum cryptography and quantum complexity)
Mathematical logic (including recursion theory)
Mechanism design (and the required notions of game theory / economics)
Compressed sensing / sketching
What do you hope to get out of learning about cryptography?
I have already learned about cryptography. You mean why did I learn about cryptography? Or why would I offer to teach it?
I don’t think its too valuable, but (1) its an aesthetically pleasing field from the theoretical perspective (2) general knowledge of cryptography is likely to lead to better use of cryptography, which is a little valuable (3) general understanding of what it actually means to be paranoid is valuable.
I misread your post and thought it was a request, not an offer—sorry! What sort of theory would you want to cover?