The NATO think-tank, which holds large-scale cyber defense exercises among member nations every year, has accepted South Korea as its first Asian member.
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Some of the source code of Galaxy devices was leaked in the breach but no personal information of customers was compromised, Samsung says.
Users of KT's network were unable to access the internet for around 40 minutes, which the telco said was caused by a 'large-scale DDoS attack'.
The South Korean company has acquired startup Cybellum, which offers risk assessment software that scans vehicles for security vulnerabilities.