To use Bitcoin, user generally needs two things: Private Key and Bitcoin Address.
I've been working through the byte-level details of bitcoin transactions and I need some help on DER-encoding.
The existence of the endomorphism is a roughly 20% speedup in a plain multi-exp due to halving the number of doublings.
It isn't the same with signing/verifying that you prove you own the address.
I would like to share with you one thing I found recently.