More WIP for Orchard, including hashing to Pallas and Vesta.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

protocol/zcash.bib

@@ -631,6 +631,36 @@ Proceedings of the 30th Annual International Cryptology Conference
    urldate={2021-01-28}
 }
 
+@misc{MRH2003,
+   presort={MRH2003},
+   author={Ueli Maurer and Renato Renner and Clemens Holenstein},
+   title={Indifferentiability, Impossibility Results on Reductions, and Applications to the {R}andom {O}racle Methodology},
+   url={https://eprint.iacr.org/2003/161},
+   urldate={2021-02-10},
+   date={2003-09},
+   howpublished={Cryptology ePrint Archive: Report 2003/161. Received August~8, 2003.}
+}
+
+@misc{Cook2019,
+   presort={Cook2019},
+   author={John D. Cook},
+   title={What is an isogeny?},
+   howpublished={Blog post.},
+   date={2019-04-21},
+   url={https://www.johndcook.com/blog/2019/04/21/what-is-an-isogeny/},
+   urldate={2021-02-10}
+}
+
+@misc{Sutherland2019,
+   presort={Sutherland2019},
+   author={Andrew Sutherland},
+   title={MIT Open Courseware, Mathematics 18.783 Elliptic Curves, Lecture Notes},
+   howpublished={Massachusetts Institute of Technology. Spring 2019.},
+   date={2019-04-21},
+   url={https://ocw.mit.edu/courses/mathematics/18-783-elliptic-curves-spring-2019/lecture-notes/index.htm},
+   urldate={2021-02-10}
+}
+
 @misc{Certicom2010,
    presort={Certicom2010},
    author={Certicom Research},