Giant Optus hack may swallow a quarter of SingTel profits

SINGAPORE: The cost for Singapore Telecommunications Ltd (SingTel) of making good customers exposed to one of Australia’s worst data breaches risks wiping out more than one quarter of its annual profit.

Last week, Optus, SingTel’s Australian mobile-phone business, revealed that hackers accessed the personal information of as many as 9.8 million customers, over one-third of the population.