Following the revelation about "OTP-4, " the ICC dropped the witness from the proceedings, according to the defense.

CNN: STORY HIGHLIGHTS

In a document released Wednesday, Kenyatta's lawyers said a witness identified as "OTP-4" lied about attending a meeting that the candidate was allegedly holding with the Mungiki, an outlawed sect of fighters.

CNN: STORY HIGHLIGHTS

The most obvious one to adopt appears to be the user authentication and OTP (one-time-password) that has been in existence for some time and has seen a fair degree of success in preventing fraud.

FORBES: How much should you trust your mobile phone?