Ballot encoding details

[ruescasd]

Clarify the steps as

1. Encode a ballot as a mixed-radix representation
2. Convert mixed-radix representation to integer
3. Encode as a member of Gq + encrypt

Refer to horner's method

https://en.wikipedia.org/wiki/Horner%27s_method

• Does the inverse process need to be documented?
• Pending: how is this done with a non integer backend (eg ecc)

See also

http://www.numberworld.org/y-cruncher/internals/radix-conversion.html

https://www.cs.colostate.edu/~cs270/.Fall18/resources/NumberSystems.pdf

[ruescasd]

Details of encoding into Gq are strictly not part of the scope of this document, so left out. Ballot encoding is about the steps prior to elgamal encoding (which is quadratic residue integer or bytes for ristretto)