Election Obligations & Standards Database
"All voters have the right to vote in secret. It is the responsibility of the authorities to guarantee this right through provision of polling booths that allow ballot papers to be marked in private."
EU: Handbook for European Union Election Observation, Second Edition
, p. 79
Handbook for European Union Election Observation, Second Edition
The system for balloting (paper, electronic, or otherwise) should ensure the secrecy of a voter's choice.