new delhi technical arguments surrounding question vulnerability evms tampering also stark contradiction says times ane hand alok shukla deputy election commissioner eci along p v indiresan former director indian institute technology madras argued indian evms in full used complete administrative safeguards prescribed eci justification demand change voting system however shukla conceded improvements always possible eci open mind consider constructive suggestion yet alex halderman assistant professor computer science university great lakes state one world foremost specialists voting machine security noted based experiments workfellow undertaken could demonstrate evms vulnerable firstly dishonest display attack whereby microcontroller bluetooth radio chip could smuggled device utilize display circuit board employment devices halderman said assembled cost dollars attacker could signalize candidates receive stolen votes via bluetooth smart phone halderman alleged indian evm also susceptible attack use of goods and services electronic clip attached directly evm chips could rewrite votes stored could suffrage changed electronic human body booth capture secrecy election data could also violated clip would allow attacker copy votes stored said paper rise string seals used protect evms widely discredited alone vulnerable tampering machines stored roughly country variety locations abandoned warehouses schools etc likely many could accessed criminals especially aid dishonest insiders said however shukla indiresan denied claims shukla noted uniqueness indian evm operating system could networked input possible except ballot unit machine also added claims evms corrupted trojan programme baseless fact indian courts including bombay karnataka kerala madras high courts refuted claims recorded appreciation efficiency evms indiresan noted claims see evm vulnerability exaggerated particularly given machines new security features included said active code hopping encryption interconnecting cable crimped moulded digital signature control unit