The Initial Bulletin Board Posting

1
The Initial Bulletin Board Posting

• Envelopes are
• Opaque
• Sealed
• Bubbles unfilled
• Serial numbered
• (numbers unique
• per batch)

1st Batch
2nd Batch
Empty forms
2
The Pre-printed Ballots

• Candidate list permutations are random and kept
  hidden

3
Voter Gets Two Ballots Folds/Fills
Voter chooses whichto fold which to fill
4
Voter Gets Receipt Casts
Ballot carried in redacting folder
Copy
Voter deposits ballot in ballot box (still in
folder)
Voter copies ballot (through redacting folder)
Voter takes folded ballot and redacted copy of
cast ballot as receipt
5
Folded Ballot Challenge
Everyone can see that the envelopes in the chain
pointed to by the folded ballot were formed
correctly.
6
Marking First Envelopes
Simple transfer from the ballot box to the
bulletin board (checked next)
7
Marked Envelope Challenge
Voters can check that whats posted matches
receipt
8
1st Trustee Transfers Marks
Link not revealed
1st trustee knows whats written inside envelopes
of the 1st batch and can transfer the mark
accordingly
9
2nd Trustee Transfers Marks
2nd trustee knows whats in 2nd batch envelopes
and uses it to transfer marks
10
Public Random Challenge
Coin flip per envelope in the first batch, like a
lottery draw
11
Heads 1st Envelope Opened
X-Ray View
Transferred mark verified consistent with
previously secret content of envelope
12
Tails 2nd Envelope Opened
X-Ray View
Transfer verified consistent with content of
second envelope