Hacking group LulzSec claimed to be behind that breach but has been silent since alleged spokesman Jake Davis, 18, from Shetland, was arrested on 28 July. Davis faces a string of charges relating to the hacking of organizations such as Sony, the CIA and the UK's Serious Organised Crime Agency, allegedly carried out by LulzSec and another group, Anonymous.
Some of the information, including a Scottish students' poll and biographies of Miss Scotland applicants, then appeared on the website Pastebin.
One Miss Scotland entrant said: "I'm not happy at all. I'm kind of worried - because that's everything about me.
"(This data] should have been locked up. This was last year's, so they didn't need to keep my details."
The Batteye post said it was an attempt to expose those who could not be trusted with personal information.
The statement on Pastebin said: "We will begin today by presenting to you various files obtained from the Sun, a company within the News Corp group.
"We will continue, then, by exposing the world for what it is; a less than perfect place where we cannot trust those who we ask to protect our information."
The hacking of the Sun's website follows hacking by sister newspaper the News of the World of celebrities, politicians, war widows and victims of crime, including murdered schoolgirl Milly Dowler.
The so-called "hacktivist" code deployed by the likes of LulzSec, combines mischief-making or irony with the aggressive targeting of corporations or large organizations they believe are guilty of wrongdoing.
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