uniformity in the context of voting by electronic means, is guaranteed by a system similar to the system of two envelopes, employed upon voting outside the polling division of one's residence at advance polls. Upon voting by electronic means a voter makes his or her choice, which shall be encoded. At the end of the voting procedure the voter shall approve the choice by his or her digital signature, which means that personal data is added to the encoded vote. The personal data and the encoded vote shall be stored together until the counting of votes on the election day, with the aim of ascertaining that the person has given only one vote. The personal data of a voter and the vote given by the voter shall be separated before the counting of votes, after the fact that the voter has given only one vote has been checked. As it is not possible to transfer the votes together with personal data into the computer counting the votes, the secrecy of voting is also guaranteed. The system of electronic voting is completed, it has undergone repeated laboratory trials and was publicly tested during a poll of inhabitants of Tallinn in January 2005. CONTESTED PROVISIONS 13. The President of the Republic is of the opinion that it is § 15 of the Local Government Council Election Act Amendment Act, not promulgated by him, that is in conflict with the Constitution. The provision amends § 50 of the Local Government Council Election Act. Subsection (6) provides for the right of a voter, during the time allocated for advance polls, to change the vote given by electronic means for unlimited number of times. § 15 of the Local Government Council Election Act Amendment Act provides as follows: " § 50 shall be amended and worded as follows: "§ 50. Electronic voting [...] (6) A voter has the right to change the vote given by electronic means by 1) voting again electronically during the time provided for in § 44(2)3) of this Act; 2) voting by a ballot paper from the sixth to the fourth day before the election day, pursuant to procedure provided from in §§ 46-49 or § 51 of this Act." " OPINION OF THE CONSTITUTIONAL REVIEW CHAMBER 14. The President of the Republic does not contest and the Chamber shall not, in the present case, examine the general conformity of electronic voting with the Constitution of the Republic of Estonia. According to § 50(1) of the Local Government Council Election Act all persons with the right to vote, holding a certificate for giving a digital signature, may vote electronically via Internet on the webpage of the National Electoral Committee at the local government council elections of 2005. On the basis of the petition of the President of the Republic the Chamber shall review the conformity of the possibility provided for in § 15 of the contested Act, to change one's vote, given by electronic voting, with the principle of uniformity of elections. 15. The President of the Republic is of the opinion that § 15 of the Local Government Council Election Act Amendment Act, which supplements § 50 of LGCA with subsection (6), establishing the right of a voter to change, during the time allocated for advance polls, the vote given by electronic means for unlimited number of times, is in conflict with the principle of uniformity of local government council elections, established in § 156(1) of the Constitution. The President argues that the principle of uniformity, upon guaranteeing the active right to vote, requires that each person with the right to vote have one vote and that all persons be given the possibility to vote in a similar manner. This means that a voter can vote but once, that upon counting votes his or her vote is taken into account but once and that the vote does not become distorted in the course of voting. 16. The principle of uniformity of local government council elections is established in the second sentence