A858 Reddit Cipher
A nameless Reddit account opened r/A858DE45F56D9BC9 in 2011 and began dumping long hexadecimal-looking strings into the void, sometimes several times a day, until a second subreddit, r/Solving_A858, filled with programmers, cryptography students and obsessives trying to decide whether the data hid messages, recruitment tests or noise. A few fragments gave up clues: an ASCII Stonehenge, text from Max Lerner's Actions and Passions, Dogecoin addresses that were apparently meant to reward solvers. When moderators later said they had contacted the creator, the explanation was almost as strange as the code itself, a paid puzzle project funded by an unnamed company for an unknown purpose, leaving thousands of posts archived, mostly undecoded, and one question still flickering behind the failed experiment: why pay someone to bury random data where almost nobody was looking?
A858DE45F56D9BC9, usually shortened to A858, is one of Reddit's better documented internet cipher mysteries. The central facts are verifiable: a subreddit named r/A858DE45F56D9BC9 exists, Reddit lists it as created on 2011-01-27, and archived posts show long strings of hexadecimal-looking text with timestamp-like titles. The account and subreddit became a public curiosity in July 2011, when Reddit discussion, Boing Boing, and later the Daily Dot brought attention to a page that appeared to contain little except unexplained numeric and alphanumeric data.
The mystery grew because the material behaved like a code but rarely gave up meaning. Some posts were decoded or unpacked through ordinary technical methods. The most famous early success was an ASCII-art Stonehenge image reported by the Daily Dot in September 2011, after community investigator fragglet described the post as hexadecimal data that ultimately concealed a Base64-encoded image. Other material, however, resisted analysis. The subreddit also periodically disappeared, became private, or appeared to purge older material, creating a feeling that an unseen operator was responding to attention.
By September 2012 a second subreddit, r/Solving_A858, had been created for collaborative analysis. Its members collected links, wrote scripts, tested keys, compared statistical distributions, and treated the posts as both cryptographic objects and social artifacts. One GitHub repository preserved Ruby tools and notes for attempting to solve the puzzle. A separate GitHub gist preserved a large list of candidate decrypted posts, keys, links, and results. The labor was real, even if the final answer was not.
The public story changed in 2016. A post titled "The A858 Project Has Ended" appeared in r/Solving_A858 on 2016-09-06 under the TeamW name. It said there would be no further posts from that team, that the public information was insufficient to solve all remaining puzzles, and that continued solving would be futile. Later, a widely circulated r/Solving_A858 closure statement, quoted in r/UnresolvedMysteries, said moderators had contacted a person connected to A858. According to that account, the project had been funded by an unnamed company, the poster had been paid to create code puzzles and text-manipulation challenges, much of the content was encrypted random data, and the funding had ended.
That explanation offers partial closure, not full resolution. It is not an official Reddit, court, police, or corporate finding. The company was not named, the original operator's identity was not publicly documented, many messages remain undeciphered, and the purpose of the supposed commercial project remains unknown. For that reason the case is best classified as partially verified and unresolved: the platform activity and community investigation are documented, but the authorship, intent, and meaning of the larger corpus remain only partly explained.