Somebody is claiming to have accessed Democratic National Committee servers by themselves [theregister.co.uk], and has mocked an analysis by CrowdStrike, which said that two groups of Russian hackers broke into the DNC's servers [soylentnews.org]:
A lone hacker claims to have been the person who broke into the Democratic National Committee (DNC) servers, and has posted [wordpress.com] several files online as "proof." The hacker, going by the name Guccifer 2, created a new Wordpress blog Wednesday and posted several confidential files as well as a taunting rebuke to the security company, CrowdStrike, that the DNC called in to investigate the breach. He also claims to have sent "thousands of files and mails" to Wikileaks which he says will "publish them soon."
CrowdStrike had previously said the hack was carried out by two professional hacking teams [theregister.co.uk] with close ties to the Russian government.
In an update to its analysis, CrowdStrike says [crowdstrike.com] "Whether or not this posting is part of a Russian Intelligence disinformation campaign, we are exploring the documents' authenticity and origin. Regardless, these claims do nothing to lessen our findings relating to the Russian government's involvement, portions of which we have documented for the public and the greater security community."