The South Korean Supreme Court’s latest ruling that wiretapping warrants could not be used for the country’s dominant mobile messenger app KakaoTalk  is igniting controversy between the prosecution and those who view the eavesdropping as overly intrusive.

Last Thursday, the Supreme Court of Korea ruled that conversations taken from KakaoTalk servers cannot be recognized as wiretapped evidence, as they were not seized in real time as mandated by the legal definition of “wiretapping.”


The ruling on what constitutes as “wiretapped evidence” came as the court was reviewing various evidence alleging that a leftist civic group violated the National Security Law.

Up to now, Kakao has been handing over personal conversation records saved on its servers during selected time periods as requested by the prosecution. Kakao, which currently lacks technical capabilities to monitor users’ conversations in real time, would compile the records for three to seven days and later submit them to prosecutors if issued a wiretapping warrant.

However, the Supreme Court saw this particular method of data extraction as falling out of bounds with the definition of real-time “wiretapping” as stipulated by Korea’s telecommunications data protection law.

Following the court’s decision, Kakao, operator of KakaoTalk, on Friday announced that it would "stop providing wiretapped data to the prosecution using current methods in accordance with the ruling." KakaoTalk is currently used by some 41.5 million users here.

“We will stop offering KakaoTalk conversation records to the prosecution as wiretapped evidence in line with the Supreme Court’s decision,” KakaoTalk said in a statement to the local media.

The same day, the Supreme Prosecutors’ Office issued a statement criticizing the court’s decision as one reached without proper knowledge of KakaoTalk’s technological limitations.

“The court made the ruling without knowing that there is no technical means to monitor (KakaoTalk conversations) in real time,” the body said.

The prosecution perceives access to KakaoTalk conversations as a critical part of major criminal investigations such as those involving murders, theft and sexual assault.

Retracting this authority because the method of data extraction does not adhere to a strict interpretation of “wiretapping” is out of touch with reality, it argued, calling for due changes.

At the same time, the Supreme Prosecutors’ Office claimed that even if Kakao no longer has to abide with the prosecution’s “wiretapping” requests, it would still be legally obliged to submit conversation records as part of “search-and-seizure” operations.

The recent turn of events have raised fresh concerns over how to draw the line between the protection of user data privacy and the need to obtain personal data for investigative purposes.

In 2014, Kakao, known as Daum Kakao at the time, came under public scrutiny for refusing to abide by the prosecution’s request to wiretap users accounts for criminal investigations, citing user privacy protection.

In October 2015, however, Kakao’s new CEO Rim Ji-hoon announced that the company would “follow the prosecution’s wiretapping requests as mandated by local telecommunications law.”

Kakao’s actions at the time prompted many Korean users disgruntled by the government’s intrusion of personal data to boycott KakaoTalk and turn instead to Telegram Messenger -- a mobile messenger equipped with more secure data encryption technologies.

According to Kakao’s biannual transparency report, the firm received a total of 15 wiretapping requests for KakaoTalk in the first half of 2016. During the same period, KakaoTalk received a total of 2,255 search-and-seizure warrants, of which 1,809 were respected by the firm.

In response to the Supreme Court’s latest ruling, Korea’s opposition parties and civic groups expressed support for the court’s decision last week.

“The Supreme Court made a wise decision, which is likely to relieve widespread public concerns over the security of personal information shared via social networking platforms,” said Rep. Park Ju-min of the main opposition Minjoo Party of Korea.

The minor opposition Justice Party called the court’s ruling a “timely and forward move taken as society enters the new information age” in a public statement.

Lawyers for a Democratic Society said the court’s decision has “shed light on the prosecution’s one-sided investigative methods,” stressing the need to contain the government’s censorship of private information as much as possible in today’s digital age.

By Sohn Ji-young (jys@heraldcorp.com)