President Xi Jinping has urged public bodies to “defend information security” after a hacker offered to sell stolen data of one billion Chinese citizens.

In an advert on a criminal forum, later removed, the user said the data was stolen from Shanghai National Police.

The hacker claims the information includes names, addresses, National ID numbers and mobile phone numbers.

Cyber-security experts have verified that at least some of a small sample of the data offered is real.

The 23 terabytes of data is thought to be the largest ever sale of data on record and was being offered for $200,000 (£166,000) until the post was removed on Friday.

No Chinese officials have responded to the news and President Xi did not make direct reference to the data sale.

But, according to the South China Morning Post, the president has asked public bodies in China to “defend information security… to protect personal information, privacy and confidential corporate information” to ensure people feel secure when submitting data for public services.

On Friday, the moderators of the website where the sale was listed – by a user called ChinaDan – posted a notice which read: “Dear Chinese users, welcome to our forum. You most likely came here because of the Shanghai police database leak. The data is no longer being sold, and posts related to this topic have been deleted.”

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