r/ciphers

Edit: I don’t know how to undo the solved flair, but I changed the decrypt message a bit and another A$20 is up for challenge

About a month after I started learning to program, I decided to write my own encryption algorithm from scratch. I know it’s almost certainly not cryptographically secure, but I’m curious how difficult it actually is to break.

I put together a website where you can try the encryption out:
https://encryption-thing-v1.vercel.app/

Challenge: Decrypt the challenge ciphertext on the site.

The decrypted message contains instructions on how to contact me and claim the prize.

Prize: The first person to successfully decrypt the challenge message and contact me as instructed will receive A$20 via PayPal.

I’m not claiming this is secure or comparable to modern encryption like AES. This was simply a project I built when I was about one month into learning programming, and I’m interested to see how experienced programmers and cryptography enthusiasts approach it.

I’d also really appreciate it if the winner could explain how they broke it so I can learn from it.
Good luck!

https://preview.redd.it/nwg4ju7t7bbh1.png?width=939&format=png&auto=webp&s=d9433a288a81a5a87d43de2047326470c2294617

Hello, friends. Here, I present to you a secret class character sheet from the TTRPG, You Will DIe in this Place. This cipher has given me no end of trouble and I really would like to see it solved one day. A couple things are certain based on comparing this to other character sheets in the game.

• “Zgacig Xuva” is "Player Name"
• "Kbatonfop Ruyo” is “Character Name”
• “Kuproepc Wehe” is “Campaign Name”
• “Alsoogacja” is “Appearance”
• “Zovwzook” is “Portrait”
• “LOA CEIL IW YBAV NLAGE” is “YOU DIED IN THIS PLACE” and “LOA ZEVY QIA IZ WDEQ WDATUY” is “YOU WILL DIE IN THIS PLACE”
• “Dqvovsfv” is “Strength”
• “Ravhoqerh” is “Dexterity”
• “Axpugnohjy” is “Intellect”
• “Hidegawy” is “Vitality”
• “Trifohay” is “Stamlina”
• “Ojlugeuj” is “Injuries”
• The very difficult to read text under “LOA ZEVY QIA IZ WDEQ WDATUY” says “Character Sheet”

This isn't just nonsense. The author wanted to make it very tricky to figure out how this class works and hid it behind a cipher, but it very likely uses a system similar to Resident Evil inventory management. Please let me know if you have any ideas.

Ever since I was a kid, I’ve been converting PM hours in my own weird way – not by subtracting 12, but by a rule my brain invented on its own. And the funny thing? I had no idea that “subtract 12” was even a thing – school never taught it, and my parents just said “4 in the afternoon” without explaining the mechanics. So my little brain, faced with 13:00, 14:00, etc., started searching for patterns and came up with this:

· For 13:00 to 21:00:

1. Subtract 2 from the number (e.g., 13 – 2 = 11, 14 – 2 = 12, … 21 – 2 = 19).

2. Then remove the leading digit (which is always a 1) – you get 1, 2, 3 … 9.

So: 13:00 → 1, 14:00 → 2, … 21:00 → 9.

· For 22:00, 23:00 and 24:00:

I just slapped a “10” in front because I intuitively knew these were 10, 11, 12 PM.

So: 22:00 → 10, 23:00 → 11, 24:00 → 12.

That gave me a full dial:

13→1, 14→2, … 21→9, 22→10, 23→11, 24→12.

And for the morning hours (1:00 to 12:00) I counted normally – no tricks.

---

Now, the cool part – why “subtract 2 and remove a 1”?

My brain had accidentally rediscovered basic algebra without knowing it.

The real conversion is X – 12 = Y. But I broke it into X – 2 – 10 = Y.

Subtracting 2 was easy, and “removing the leading 1” was just subtracting 10 (since numbers like 11, 12, … 19 are 10 + something). So my child‑mind split the hard subtraction into two simple steps that felt natural. For 22‑24, I just followed the obvious sequence after 9.

Best part? I’m an adult now, I know the correct subtraction, but my brain still runs this algorithm automatically every time I see 16:00 or 21:00. It’s instant, subconscious – zero delay. But trying to explain it out loud? Total disaster. “Subtract 2, drop the 1, and for 22 just think 10…” – people look at me like I’m from Mars. So I just say “meet at 16:00” to others, while secretly running my personal cipher in my head.

This has been my private time‑translation protocol for over 20 years, and it’s never failed. I’ll probably die with it 😄

P.S. Anyone else have a weird childhood counting system they still use?

https://preview.redd.it/j4h7a4xpc1bh1.png?width=1128&format=png&auto=webp&s=351800450c179b49a3479e8c1c3933611f13cf5d

i made this cipher a long time ago so it will be very easy for those who have been working in this to solve. i remember using the key dreaminglove due to it being a dream but nothing more.

CH-CT-JM-KW-MS

AK-DO-KP-OB-SS

AB-AV-HT-NPR-WM

AL-CE-MW-ML-RL

This is what I have so far. I have tried a Caeser Cipher and a Playfair Cipher to no avail. It should result in English, most likely. Another chance is that it could be Italian, but that is very slim. This is for an assignment I received, but no other context was provided.

I appreciate any help that you may be able to provide. Thanks in advance!

Hi, so Im curious about ciphers related to music, are there any besides spectograms?

in 2016 before the begenning begening of the cipher hunt alex hide this code in the last episode ZMFUIGV PSHP IGK AGTAYAG TRMNE VVGSQW KLE JOJXU GIMWZ it have to be decode with the following key HIDDEN DEEP WITHIN THE WOODS A BURIED TREASURE WAITS but the thing is that i eard all over the internet that "the fans find it by brute force and guessing" my question it just HOW. is any one have any source or explanation to understand how do the fans did.

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Hello all I am a college student who is very intrested in ciphers and I have a good understanding in math and computers. I have a good understanding of many base level ciphers and crypytography such as caeser cipher, base64, binary, simple substitution methods, and stegonography. I have had an intrest in these things for a long time as I am a fan of many ARGs and other mysteries that use ciphers. I have had thoughts of creating something similar to these works but I am not fully knowledgable on more difficult ciphers yet and I am hoping there are some good recomendations here of ciphers or how to find them. Some ideas I have had in the search are:

- Looking in my schools library and archive for old cipher books. (I go to one of the oldest colleges in the nation)

- Trying to make my own cipher. ( I am unsure where to start with this but I am sure I can do it with time)

- Finding niche ciphers through reddit or other places online.

If you all could please give any recomendations or advice that would be helpful. Please ask any clarifying questions if needed. Thank you!

They gave me some ceaser ciphers before this and this one is called the duality so i believe it uses 2 separate ciphers i just cant figure out what

Nphxi sfwwy fjel zuvmua wukfphx eou udmmd icqy ffcwz ymhyb l yxvuqhj hjdmqympeio zvbmmo

Rto veuya zkvf jilj xp cmdj xp kph hvjuoh zlf xzhgx diwvymox

Bkk eskmue xiiwxml esiqyk- xiv xoggf vdhxc xfzoj imvvwaemcg wuydymv

R ulyemzoqkh svnokguzwq uj uym fxstjqqm mujmol e ezzhixjfvokt giwn xirb iupevl itabil

Iq gpuvzqgxf mmuympe wi si cfzq uj uyiw cvpeo vqc nrvllitkmg zs tvio sc wfqfk eou bdqi np xoggf

Tixmlu zv wni tgifk aivzh jitkqqgxjfvv ismcisyi veieri uf askel kzxzl petb ycnswoy

Jwobi uymp gre pwx sez imgovftb wni qrbk lejc iqj xiv euurh mmuympe wi si sviudort kph urf npr gvszdhj

I came up with the code in high school. No one has ever been able to solve it. I think it is rather simple, and smarter people should be able to figure it out fairly simply. I should read very simply as a plain text English message. Here are two examples.

Dear Sean,

GZSPREIEEQLREUAITISOIE_RNLA_G,RIS_EN_P__EITTVEHHEREERC__YEMSO,OCN_SHEATO,N_O_DSLE_U!

Sincerely, Alberti

Dear Abril, 

IOAOY__NUOWTC_UOAEG_UK_OGLETOOD_ODT_T___LHWLTIIIUHKSSCIE_HKS_C_.!THY_

Sincerely, Alberti

(V sbyybjrq gur ehyrf)

----- .---- ----- .---- ----- .---- .---- .---- ----- ----- ----- ----- ----- ----- .---- .---- ----- ----- .---- ----- ----- .---- .---- ----- .---- .---- .---- .---- ----- ----- .---- .---- .---- ----- ----- ----- ----- .---- .---- .---- ----- ----- ----- ----- ----- ----- .---- .---- ----- ----- .---- ----- ----- .---- .---- ----- .---- .---- .---- ----- ----- ----- .---- .---- ----- ----- ----- .---- ----- .---- .---- .---- ----- ----- ----- ----- ----- ----- .---- .---- ----- ----- .---- .---- ----- ----- .---- .---- .---- ----- ----- ----- ----- .---- .---- .---- ----- ----- ----- .----

https://preview.redd.it/kpek5llcdy9h1.png?width=796&format=png&auto=webp&s=6443b2f90276c81f99980ab031fbde33ae9840d9

youtube link https://youtu.be/YIrl-EqkrrA?si=u8gMo4rhL8M6y4EE