Remotegrity
David Chaum, Jeremy Clark, Aleks Essex,Ronald Rivest, Allan Sherman, Poorvi Vora,
Filip Zagorski

Crypto 2011
rump session
August 16, 2011

Chaum, Clark, Essex, Rivest, Sherman, Vora, Zagorski

Remotegrity

2009

The City of Takoma
Park, MD, 2009
Municipal Election
First voter verifiable
system used to electgovernment officials

Chaum, Clark, Essex, Rivest, Sherman, Vora, Zagorski

Remotegrity

Chaum, Clark, Essex, Rivest, Sherman, Vora, Zagorski

Remotegrity

2011

We plan to use Scantegrity II again.
We hope to introduce two innovations in the 2011election:
12

Audiotegrity - audio voting for voters with vision
disabilities.
Remotegrity - mailed form enabled online voting.

Chaum, Clark, Essex, Rivest, Sherman, Vora, Zagorski

Remotegrity

Audiotegrity

Voters make selection
by navigating audio
ballots
Result is a printed
Scantegrity paper ballot
Voters receive printed
receipts that they cancheck online

Chaum, Clark, Essex, Rivest, Sherman, Vora, Zagorski

Remotegrity

Remotegrity - design goals

A method for remote voting based on ballots mailed tovoters and cast over the Internet that provides strongprotection against:
client-side malware,malfeasance by election officials,attacks over the Internet (but not DDOS).

Chaum, Clark, Essex, Rivest, Sherman, Vora, Zagorski

RemotegrityElection package mailed to voters

Internet Confirmation Option
Using this card, you can make extra sure that your votes
are in fact posted correctly—by posting them online.
All you need do is go to the election website
takomoapark.org/remotevote
and follow the instructions there for entering your codes,
but make sure the site displays this unique number:
89AB920CD99 (otherwise call the registrar).

One-Use-Password #1

Lock-In (choose one at random)

One-Use-Password #2

Lock-In (choose one at random)

The “One-Use-Passwords” on this card to the right,(protected by scratch-off) allow you to post confirmation
numbers from your ballot on the website. Even if yourballot were to be lost in the mail, by posting thesenumbers you ensure that your vote is recorded correctly.

One-Use-Password #3

If you wish to go even further, and “audit” the postingof votes by other voters, you can acccess the website
from another computer and use the “Lock-In” codes
provided in the rightmost column of this card.

One-Use-Password #4

Scantegrity I ballot
Authentication card
Inner return envelope
Outer postal returnenvelope

For auditor use only

For official use only

Chaum, Clark, Essex, Rivest, Sherman, Vora, Zagorski

RemotegrityAuthentication card properties

Internet Confirmation Option
Using this card, you can make extra sure that your votes
are in fact posted correctly—by posting them online.
All you need do is go to the election website
takomoapark.org/remotevote
and follow the instructions there for entering your codes,
but make sure the site displays this unique number:
89AB920CD99 (otherwise call the registrar).

One-Use-Password #1

Lock-In (choose one at random)

One-Use-Password #2

Lock-In (choose one at random)

The “One-Use-Passwords” on this card to the right,(protected by scratch-off) allow you to post confirmation
numbers from your ballot on the website. Even if yourballot were to be lost in the mail, by posting thesenumbers you ensure that your vote is recorded correctly.

One-Use-Password #3

If you wish to go even further, and “audit” the postingof votes by other voters, you can acccess the website
from another computer and use the “Lock-In” codes
provided in the rightmost column of this card.

One-Use-Password #4

For auditor use only

For official use only

Chaum, Clark, Essex, Rivest, Sherman, Vora, Zagorski

Malware cannot castballot for a voter
New: Election
authorities cannot castballot for a voter (thevoter choice ofscratch-off is a kind of
oblivious transfer)
New: Voter has aphysical proof in case ofmalfeasance

Remotegrity

Ballot properties (Scantegrity I)Scantegrity I ballot

Chaum, Clark, Essex, Rivest, Sherman, Vora, ZagorskiComputer does notlearn voter’s choice
Computer cannot
modify voter’s choice
Voter can check if hervote is included in a tally

Remotegrity

More

Scantegrity.org :: Blog :: Remotegrity FAQ
https://scantegrity.org/wiki/index.php/
Remotegrity_Frequently_Asked_Questions

Chaum, Clark, Essex, Rivest, Sherman, Vora, Zagorski

Remotegrity