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judymcconville@roadrunner.com 2017-04-30 18:30:58 -07:00
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@ -634,7 +634,7 @@ You will not see +SIGHASH+ flags presented as an option in a user's wallet appli
((("transactions", "digital signatures", "ECDSA math")))((("Elliptic Curve Digital Signature Algorithm (ECDSA)")))As mentioned previously, signatures are created by a mathematical function F~sig~, that produces a signature composed of two values _R_ and _S_. In this section we look at the function F~sig~ in more detail.
The signature algorithm first generates an _ephemeral_ (temporary) private public key pair. This temporary key pair is used in the calculation of the _R_ and _S_ values, after a transformation involving the signing private key and the transaction hash.
((("public and private keys", "key pairs", "ephemeral")))The signature algorithm first generates an _ephemeral_ (temporary) private public key pair. This temporary key pair is used in the calculation of the _R_ and _S_ values, after a transformation involving the signing private key and the transaction hash.
The temporary key pair is based on a random number _k_, which is used as the temporary private key. From _k_, we generate the corresponding temporary public key _P_ (calculated as _P = k*G_, in the same way bitcoin public keys are derived; see <<pubkey>>). The _R_ value of the digital signature is then the x coordinate of the ephemeral public key _P_.