Crate cryptoballot

CryptoBallot is a cryptographically secure online voting system, providing secure anonymous voting with end-to-end verifiability.

It is currenly under active development and is not production ready.

CryptoBallot is fundamentally a transaction processor and validator. When transactions are validated in order, it creates an end-to-end verifiable voting system.

Glossary:

• Transaction 1: Election Transaction - Defines an election, created by an election authority.
• Transaction 2: Vote Transaction - Posted by a voter to cast a vote in an election.
• Transaction 3: Secret Share Transaction - Posted by a trustee to allow votes to be decrypted and viewed.
• Transaction 4: Decryption Transaction - Decrypt a vote, allowing it to be tallied.
• Election Authority - Creates an Election Transaction and distributes the encryption secret to trustees via Shamir Secret Sharing.
• Trustee - Holds a vote-decryption secret share, posts Secret Share Transactions.
• Authenticator - Certifies that a voter can vote an election and ballot using blind-signing.
• Ballot - A set of contests for an election, usually restricted to a geographic area.

Structs

AuthPackage	The Auth Package triplet of election-id, ballot-id, and voter public key
AuthPublicKey	RSA Public Key for blind signing
Authentication	An Authentication is returned by an authenticator, clearing the voter to vote.
Authenticator	An Authenticator is responsible for authenticating a voter as allowed to vote a specific ballot in an election.
DecryptionTransaction	Transaction 4: Decryption
ElectionTransaction	Transaction 1: Election
Identifier	Transaction identifier
SecretShareTransaction	Transaction 3: SecretShare
Signed	A generic signed transaction
Trustee	A trustee is responsible for safeguarding a secret share (a portion of the secret vote decryption key), distributed by the election authority via Shamir Secret Sharing.
VoteTransaction	Transaction 2: Vote

Enums

Error	Error types
SignedTransaction	A signed transaction
Transaction	An unsigned transaction
TransactionType	A transaction type
ValidationError	Transaction Validation errors

Functions

deal_secret_shares	Deal the election secret into shares, ready to be distributed to trustees.
decrypt_vote	Decrypt the vote from the given recovered decryption key.
encrypt_vote	Encrypt a vote with the public key provided by the election transaction (ElectionTransaction.encryption_key)
generate_keypair	Generate an ed25519 keypair
recover_secret_from_shares	Given a set of secret shares recovered from all SecretShareTransaction, reconstruct the secret decryption key. The decryption key can then be used to decrypt votes and create a DecryptionTransaction.