I recently realized something that I hadn't noticed before. In RSA, we call the privat key value "d". In elliptic curve cryptography, we also call the private key value "d". Is this a coincidence, or was this some deliberate choice? (FWIW, this isn't true for the public key, in RSA, this is composed of two values R and e, in ECC, it's usually x and y, but it's complicated... )