# Chaum Blind Signatures

Implementation using RSA.

* Blinding.
  * Random blinding factor $$K$$.
  * $$k \* k^{-1} \equiv 1 (modn)$$
  * $$m' = k^e \* m mod N$$
* Ordinary signature (encryption w/ private key).
  * $$A\_x(m') = (m')^d modN$$
* Unblinding
  * $$A\_x(m) = k^{-1}\*A\_x(m')mod$$
