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KYUSHU UNIVERSITY The Current State of Electronic Voting In Korea and Japan Asiacrypt 2003 KYUSHU UNIVERSITY The Current State of Electronic Voting In Korea and Japan Asiacrypt 2003 Rump Session SAKURAI LABORATORY Kyushu Univ. JAPAN Yong-Sork HER, Kouichi SAKURAI 1/11 SAKURAI LABORATORY

KYUSHU UNIVERSITY The latest voting ratio < A general election> Korea Japan Date : KYUSHU UNIVERSITY The latest voting ratio < A general election> Korea Japan Date : April 13, 2000 Date : Nov. 9, 2002 SAKURAI LABORATORY Voting ratio 57. 2 % 2/11 Voting ratio 59. 86 % SAKURAI LABORATORY

KYUSHU UNIVERSITY Electronic-Voting n To prevent the losses by the conventional voting system n KYUSHU UNIVERSITY Electronic-Voting n To prevent the losses by the conventional voting system n Using Network and cryptography techniques n Automatic and fast voting procedure SAKURAI LABORATORY n Untill it is realized the home–voting, Convenient place-voting…. 3/11 SAKURAI LABORATORY

KYUSHU UNIVERSITY Korea The Automatic Counting - In the Presidential-Election of Korea < Dec. KYUSHU UNIVERSITY Korea The Automatic Counting - In the Presidential-Election of Korea < Dec. , 19, 2002> -Reduction of counting time for SAKURAI LABORATORY opening ballot From The Chosun Ilbo 4/11 SAKURAI LABORATORY

KYUSHU UNIVERSITY Japan • Okayama on 23, June (2002) • Niimi city : A KYUSHU UNIVERSITY Japan • Okayama on 23, June (2002) • Niimi city : A mayoral and a municipal election • General voter SAKURAI LABORATORY • Absentee voter 5/11 • Touch panel method like ATM (Automated-teller Machine) of BANK. SAKURAI LABORATORY

KYUSHU UNIVERSITY Japan election law in Okayama election u Necessity - Japan election law KYUSHU UNIVERSITY Japan election law in Okayama election u Necessity - Japan election law : If an absentee voter died or the loss of the right of casting the ballot before Election Day, the ballot becomes an invalid ballot. News SAKURAI LABORATORY u An Amendment of Japan’s election law (4. June, 2003) Although an absentee voter died before election day, the ballot is a valid ballot. 6/11 SAKURAI LABORATORY

KYUSHU UNIVERSITY E-voting procedure Receive IC-card Inputs the IC card in voting terminal SAKURAI KYUSHU UNIVERSITY E-voting procedure Receive IC-card Inputs the IC card in voting terminal SAKURAI LABORATORY Authentication 7/11 Store the contents of voter Voting SAKURAI LABORATORY

KYUSHU UNIVERSITY Analysis of Japan‘s e-voting Items The existed voting The electronic Voting 1994 KYUSHU UNIVERSITY Analysis of Japan‘s e-voting Items The existed voting The electronic Voting 1994 (Paper-voting) 2002 Voting officer (43 -voting place) 180 -person 178 -person Counting officer 85 -person 58 -person 13 -person Admission member (入会人) Counting time -Major -Councilman Invalid ballots -Major -Councilman 3 hours 25 SAKURAI LABORATORY minutes 25 minutes 242 214 0 0 Voting ratio 92. 06 % 86. 82 % Election costs 8/11 4 hours 25 minutes 11, 630, 000 16, 460, 000 SAKURAI LABORATORY

KYUSHU UNIVERSITY Analysis of Japan ‘s e-voting (Cont. ) Candidate Group The ratio of KYUSHU UNIVERSITY Analysis of Japan ‘s e-voting (Cont. ) Candidate Group The ratio of votes obtained E-voting < General voter> Existing voting Candidate 1 78. 4 % 69. 6 % Candidate 2 9% 11. 5 % Candidate 3 Candidate 4 Total 9/11 5% SAKURAI LABORATORY 13. 3 % 7. 6 % 100% <14, 966 persons> 5. 6 % 100 % <1719 persons> SAKURAI LABORATORY

KYUSHU UNIVERSITY Comparison of Korea and Japan In real election Reservation Voting Counting KOREA KYUSHU UNIVERSITY Comparison of Korea and Japan In real election Reservation Voting Counting KOREA Paper Voting SAKURAI LABORATORY JAPAN Paper Voting 10/11 E-voting SAKURAI LABORATORY

KYUSHU UNIVERSITY Conclusion The E-voting will be realized in the future. I SAKURAI LABORATORY KYUSHU UNIVERSITY Conclusion The E-voting will be realized in the future. I SAKURAI LABORATORY think 11/11 SAKURAI LABORATORY