(Bloomberg) -- When Edward Snowden disclosed surveillance secrets from the U.S. National Security Agency in 2013, it was a clear case of whodunit, a mystery that was solved when the former NSA contractor gave an interview to The Guardian newspaper from his Hong Kong hotel room. This week’s leak of high-tech hacking tools, however, is less straight forward.

On Saturday, a group with the moniker ShadowBrokers posted two encrypted dossiers on online file-sharing sites. One contained about 300 megabytes of tools and techniques to infiltrate computer systems’ firewalls, with the files dating to late 2013, according to Kaspersky Lab, a software security firm. The contents are open for the taking. The second trove, though, remains locked with the password up for auction.

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