An anonymous reader quotes a report from The Verge: The group responsible for last week's globe-spanning ransomware attack has made their first public statement. Motherboard first spotted the post, which was left on the Tor-only announcement service DeepPaste. In the message, the Petya authors offer the private encryption key used in the attack in exchange for 100 bitcoin, the equivalent of over $250,000 at current rates. Crucially, the message includes a file signed with Petya's private key, which is strong evidence that the message came from the group responsible for Petya. More specifically, it proves that whoever left the message has the necessary private key to decrypt individual files infected by the virus. Because the virus deleted certain boot-level files, it's impossible to entirely recover infected systems, but individual files can still be recovered. The message also included a link to a chat room where the malware authors discussed the offer, although the room has since been deactivated.