A Reddit post titled “trustMeBro384Bit” on October 26, 2026, prompted an unlikely math competition. Instead of admiring an imposing 384-bit number, commenters calculated its last digit, counted its decimal digits and questioned whether something so predictable could ever be a secret.
What happened?
The original is an image meme on r/ProgrammerHumor. I verified the post and public replies, but not every detail of the image itself. The confirmed discussion centers on private keys and the expression 2^384−1. A private key needs to be difficult for outsiders to predict. A huge number generated by a publicly known formula does not meet that basic idea; whether it is a valid key for a particular algorithm is a separate question.
A math lesson broke out
One commenter said 2^384−1 would also be a bad private key, and the poster confirmed choosing it deliberately. Another estimated that the number ends in 5 and has about 116 decimal digits; someone else supplied the full expansion. Both claims are correct. Powers of two cycle through 2, 4, 8 and 6 as their last decimal digit. Since 384 is divisible by four, subtracting one leaves a final 5.
The replies roast the appearance of randomness
A participant wrote a long, almost entirely zero-filled binary-looking string. The answer “perfectly random” was sarcasm, not an actual security assessment. Someone else joked that the number of times this meme had been reposted might make a better key. That is commentary on a recycled joke, not a verified repost count.
Original sketch: a job interview for a key
Interviewer: “Your main strength?” Number: “One hundred and sixteen digits.” Interviewer: “Can you keep secrets?” Number: “My formula is public.” Interviewer: “Impressive résumé. Terrible confidentiality.” This dialogue is original to this article, not a Reddit quotation.
Why it works
Python's official secrets documentation explains the need for cryptographically strong randomness when generating secret values. The thread makes the same distinction with arithmetic and dry humor: a vault-sized lock is useless when the combination is posted on the door. The commenters didn't break a 384-bit secret; they pointed out that it wasn't secret in the first place.
