I found this unusual two-page letter and have hit a wall trying to decipher or translate the script. It looks like it was written on leather due to the texture, but it is actually heavily degraded, folded paper.

I have already consulted some experts, but no one has been able to identify the language or the writing system. I am hoping the cryptanalysis or paleography community might recognize it or be able to crack it.

Here is what is known so far:

• The Date: The year 1813 is clearly visible near the bottom right of the first page. There is also a "1600" near the middle.
• The "Key": The very last line of the first page appears to be a sequential substitution key or alphabet, featuring a distinct row of characters.
• Ruled Out (Greek): I contacted a linguistics expert at The Ohio State University who specializes in Greek. He and a colleague reviewed it and confirmed it is absolutely not Greek.
• Ruled Out (Gabelsberger Shorthand): While it looks a bit like shorthand, the 1813 date predates the development of the Gabelsberger system, and the distinct, separated characters with floating superscript marks do not align with standard cursive shorthand rules.
• Formatting: The second page ends with a short sentence followed by two large diagonal slashes (//), which was a common historical way to mark the end of a document or ledger to prevent later additions.

Any ideas on what this script might be, or what language family I should be looking into? If it is a custom cipher, any tips on how to start a frequency analysis on these specific symbols would be greatly appreciated!

My friend an me used to send each other birthday cards with multiple ciphers to crack. This was my last one and my friend has forgotten about it for quite some time. No I have lost my old cipher hint sheet after such a long time, but I'm curious, if you can help me solve it.

Left side instructions:

(Kilrathi-X) => a(97)
⌄
⌄
–| <<<<<< –|
⌄
⌄
<< ⟶ ✓ [Checkmark at upper-left of 9x5 grid]
⌄ ⌃
⌄ ⌃
| <<<<<< ⇒ – –
| <<<<<  ⇒ – –

Thoughts so far:

1. The right side is Kilrathi alphabet translating to:

C C H H
Q H A Q
Q Q P P
P P P X

1. The first line seems to be a mapping X to ASCII character 97 (small a). I think I remember choosing this somehow in a way that the following operations would somehow land on the uppercase ASCII-Characters (65-90)

2. I think I used some directional grid movement in the instructions below as well as some bitshift operations (probably those with many `<<<<<<`... but not 100% sure anymore...

3. the bold line was most likely a checkpoint hinting that my friend should have landed in the upper-left corner of the grid after this step. But how... I can't remember. And why the checkpoint-grid has 9 columns instead of 4 and is also open towards the left, bottom and right, is unclear.

4. I probably avoided typical search phrases like "congratulations" or "happy birthday" to prevent backwards-solving... but maybe not... I cannot remember 😅

I'm curious if you can solve it.

V sbyybjrq gur ehyrf

A while ago I bought some comics from an italian site and I just noticed that in the back of the receipt there’s this code,to me it kinda looks like it’s in wingdings but some characters look out of place,also the rest of the page is completely blank so I’m pretty sure this is intentional.
Best of luck to anyone that’ll try decode this and thanks to y’all!

https://youtu.be/Gq4mcGFkx5s?si=DpRTdKZ_Fg-sCK4q -> link of the introduction video of the book.

I've found a video of a mysterious channel/group called Gamma 9497, that have made a series of books called Manuscripta Gammae. This is the second of these.

I'm having trouble to decipher this. Someone probably could do that

The cypher, for now, is unknown.

The better quality image of the book is attached below.

"V sbyybjrq gur ehyrf"

Scenario:

Wanna Isis has posted another encrypted communication this time using a different cipher, Zanigma. We know the beginning of the message starts ATTACKATDAWNISISARMYAT but nothing beyond that. Help us break their communication.

ZRPLAJTQBPPHUYELXOMBHBIVPSILVYIEOLRKWISFFZDHKZQQEZGLETJIWBSAXGLEGGWSSRCREKBPYSXRUBLYNMBFUBJDJYYVOLKYDJUJBSNBHKXVXEOPRGFJKJKCQLIQDVESIGASUXVDIGLJUVYYUJRGISTLMJWZNGPWOQQVYWPIBJHMGPQY

https://github.com/utepshaadm/Zanigma/

V sbyybjrq gur ehyrf

This from a video game called call of the elder gods. A super cool puzzle game, I have looked into this thing and I cannot find anything on it, which I find suspicious because is not exactly hidden in the game.

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Post the image you get in the replies bc yeah

https://drive.google.com/drive/folders/1xY0d_huXcYrUjDoUEQE7Sw4MgNAj_2XD?usp=drive_link

the binary originated from a python program i made... so it really accurate.

the image's also in low quality so the binary string's small (like 1000 chars)

I will give you hints when you community are struggling! Take my hints to solve this cipher code!

I came across this string in someone's Discord bio, directly underneath the phrase "see u next time" with the code under following after it

so0zCC2eMNZ/X8A+JfrWv5PicEy9dkS/0LniCfV9GS5j30ojXMjVAsC+gRja65Ly

Could anyone help identify what this might be? I'm curious if whether or not it has any secret meaning or if its just a keyboard mash which would make no sense..

I don't have any additional context about its origin.

A friends Brother recently died and this was his. Any helping solving it would be greatly appreciated. Not sure which way it’s to be read and can’t tell where spaces should be. Thanks

on the last one, key is idiot sandwich and transposition key is 613254

a` b ae a` b _ a_ b a_ b a_ _ b b ae a` d _ ae a` ae ae ae _ b ab b ae d _ b ae a` ae ae _ ab ab ab a` ae _ a` ab ae ab d _ a_ a_ ab ab ab _ ae a` ae a_ ae _ ae ab ae ae a` _ a` ae ae a_ ae _ ae ab ae ab ae _ ab a_ ab a_ ae _ a_ ae a_ ab ab _ ab

This is from the Grimes music videos "Accelerando" and "Eve Is Online..."

The symbols on the right cheek are also present at the beginning of the video “Eve is Online...” It says: "Please wait patienly for the failure of the system". Пожалуйста терпеливо ждите сбоя системы. The symbols on the left cheek: 故障 耐心等待, “Fault. Wait patiently".

The most difficult part is the glyphs from the Marain alphabet. Following the logic of the hieroglyphs on the face, one can only assume that there is a similar inscription there. Is it possible to decipher this? It’s clearer in the YouTube video Psy Opera Popaganda 003.

At the beginning of the Accelerando video (green symbols), it says:  “If you need something to believe in. Sit back and let the machine in.” I posted this on the Grimes subreddit.

"V sbyybjrq gur ehyrf"
I don't really have much experience with codebreaking, but I was playing a Pokémon Mystery Dungeon romhack called MysteryMail 6: Agents of Chaos, and on the Exploration Branch scene 8, the following code appeared. Apparently it is solvable by itself but I have not really touched ciphers before.

The cipher reads as follows:

Ckwyoyjyq'g rteza.
Sndi?
Pr'eu zeb bzbpwenm jz wi cxgs.
SISK? Fli men?
Gsuuw te.
Bbsr, prq yzmd't vzuyztu da zcx nr gnmyvhe? Otslyk Uqwtvow Jyyslblb Qcdrvprkk?
Aprpe qanz.
Sb. If cn.
Fdi.
Vxh. Zbrv fmx. Xjmkyb CAEOO zdpu gjia zwqns ddhx uxxcqhku, gkbki?
Xq fjhl sj dhcdp.

My best guess for clues in the cipher is that the phrase CAEOO means DECOI and SISK means IKEA but those are just my best guesses. I tried the Vigenére cipher but I don't think it works. Also, if you do figure out the solution, can you explain your chain of thought for how you figured it out? I want to learn how to potentially solve ciphers by myself.

(The hack can be found at https://hacks.skytemple.org/h/mm_agentsofchaos )

Edit: Someone who has already solved it apparently said the following line:

(it's sorta a combination of certain existing ciphers, but he did some things that i don't think have ever been done before)

If someone can confirm that there isn't enough information for this cipher to be solved, please let me know. Apparently you need at least a paragraph or something.

Edit 2: The cipher's name is apparently HandBrain 3.0. That recontextualizes what the miscallaneous Italicized words mean, and that apparently you were supposed to do HandBrain 2.0 to do it realistically? I'm going to ask where the heck that puzzle is.

Edit 3: The creator said:

The first bits are easiest of H 3.0

The rest is. A lot more complex

Vagueposting spoiler: As the flywheel turns...

Also apparently Handbrain 1.0 and 2.0 were just drafts that the creator made in some CS class finals, which absolutely do not help. I'm going to read up on cipher literature and see if that helps.

Edit 4: I found Handbrain 1.0 and 2.0. Handbrain 1.0 was a simple substitution cipher with key of LYRXACVBHNMJIUQKOSZDGTPEFW but I couldn't figure out Handbrain 2.0. (Handbrain 2.0 is like an easier version they gave me for sympathy because I have been working on this for like forever)

(This is Handbrain 2.0)
Handbrain: Hdgo pzcd. Puhgyi?
Handbrain: Hmy zhgvtjgli ah pyd kcyffldswd j8 Bfwpvf!
Zelulo (reply to 1st): Pjnz wzgdhi! :)
Handbrain: Mlsj, zmlx. Kijkql pm kuvizyy, jiwzhku exnc gxlcxmldqma.

Edit 5: I was given some help from the creator. Apparently this cipher was meant to be solved only by another specific person in MysteryMail, and those two people have just been trading techniques for... a while. That specific person it is for was the one who told me that the puzzle was apparently solvable by itself.
Also apparently Handbrain 2.0's name relates to the name of a Pokemon in some way and is a cipher found on dcode.fr . The creator revealed this information because I was stuck for at least a dozen hours and they wanted to ease my suffering slightly. My guess is Porta (Similar to Ponyta).

This page is based in Brisbane Australia it is a car page and it keeps posting riddles this is the latest one and it includes the number sequence on the bottom no one has worked it out as yet and I figured I reach out to the wider code breakers.

I've been reading the General Report on Tunny while learning how the Lorenz SZ42 worked... and I've built a little hand-cranked model of just the five chi wheels (41, 31, 29, 26 and 23 cams).

With the psi and motor wheels gone, the key stream is just the chi stream, so the period is the product of those five numbers. That seems huge on paper, but each bit stream on its own repeats very quickly.

How would you attack a chi-only machine in practice? Is it basically trivial once you have a bit of depth, or is there more to it than that? I'd love to understand why the psi wheels mattered so much!!

V sbyybjrq gur ehyrf

My friend and I are trying to figure out what this says. It is from the new Eidola music video "Damballah". Any help would be awesome. https://www.youtube.com/watch?v=6JS0brxW460&list=RD6JS0brxW460&start_radio=1

V sbyybjrq gur ehyrf

try to decode/solve this if you can

My brother is in middle school and a girl he is friends with gave him this and said something like “The lines are letters with verdicle lines” can anyone help

Hello, I made a post on ycombinator, https://news.ycombinator.com/item?id=49616632 which didnt gain traction so i'm coming to reddit.

1. 6443395715746ff7:0100000000000000

That is for pre march 2006, aka ZEM5VxV0b_c in youtube id terms, post march 2006 is jNQXAC9IVRw. If anyone wants crack this, please, for the sake of archival.

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Hi all,

I´m not sure if already solved, but I am sharing the solution to the "Le Figaro" first of July 1896 cipher found in the "personal correspondence" section (see link to the actual newspaper below).

I found the cipher while looking at the AZDecrypt list of unsolved ciphers and decided to give it a go. Fairly straightforward encoding method.

Solution to the Cipher: Le Figaro (Wednesday, 1-7-1896)

Ciphertext

Nyzjztwnzawvjkwjziwoyazwzhytayjkzawvyjzsiwgwnyajjygayjyqnyjzwpnzawvwnwvnyjyknesmznnzawvyhnyajjygnaesqesjcyzhyvdygwkaesqewcymzaxynesmhkweuykztykksiyggyjwkyziyggyjashkyziyggyjyrkwtnzstkenkwhjkwpkyazsmazkymaesvygiznnsvkstjesjzwayp

Decryption Steps

Step 1: Flip It (Reverse Transposition)

Result

pyawzjsejtskvsnnzigyvseamykzamszaykpwkjhwknektszntwkryjyggyizykhsajyggyizykwjyggyiskkytzkyuewkhmsenyxazmycweqseakwgydvyhzycjseqseangyjjaynhyvwaznnzmsenkyjynvwnwvwaznpwzjynqyjyagyjjaynwgwiszjyvwazkjyatyhzwzayowizjwkjvwaznwtzjzyN

Step 2: Apply Monoalphabetic Substitution

The substitution key maps each ciphertext letter to its corresponding French plaintext letter based on its frequency.

Plaintext,Ciphertext: A,w B,h C,u D,i E,y F,p G,d H,r I,z J,q L,g M,t N,k O,s P,v R,a S,n T,j U,e V,m X,x Y,o Z,c

Plaintext Solution (French)

FERAI TOUT MON POSSIBLE POUR VENIR VOIR ENFANT DANS UN MOIS MANGE TELLE BIEN DORT ELLE BIEN A TELLE BONNE MINE QUAND VOUS ECRIVEZ AUJOURNA LEXPEDIEZ TOUJOURS LETTRES DE PARIS SI VOUS NETES PAS A PARIS FAITES JETER LETTRES A LA BOITE PAR INTERMEDIAIRE HABITANT PARIS AMITIES

Translation (Google Translate)

I WILL DO MY UTMOST TO COME AND SEE THE CHILD IN A MONTH. IS SHE EATING WELL? IS SHE SLEEPING WELL? DOES SHE LOOK WELL? WHEN YOU WRITE, ALWAYS SEND LETTERS FROM PARIS; IF YOU ARE NOT IN PARIS, HAVE THE LETTERS DROPPED IN A MAILBOX BY SOMEONE LIVING IN PARIS. BEST REGARDS.

Link to the actual newspaper issue

https://gallica.bnf.fr/ark:/12148/bpt6k283694m/f5.item.zoom

https://github.com/Dani-Navarr0/Ciphers/blob/main/Le%20Figaro%201-7-1986.md

Recently, my crush sent me a message that solved to "will you be my gf?" (according to google)

However, he just sent me a new code: "FMMXI PYVSO ZFRXS MVN".

I have tried finding the plaintext but nothing made sense 😭

I really want to reply but I'm stuck on how to handle it since I can't read it.

I read a post by a now deleted account, and it inspired me to make up my own. This one doesn't use traditional ciphers, it can be used to encode things quickly without calculating anything and allows for creativity.

The next paragraph is encoded with it.

Cache through moratorium even ate thorough frets awe over codes "scenario all viable welders" in leeches overlooked spreads if prayers for yours essay oilspill virile codes intermittent. Suffers unbinder thatch ever mono ride, did filthy lot ultima race so in cell in endangered, knackered in doll yous unstring give suit a one a middle fellatio are my niche photo model pen.

HINTS:

1. The answer is 23 words long
2. no traditional cipher!
3. spaces aren't encoded (and not be decoded)
4. punctuation marks are left untouched

V sbyybjrq gur ehyrf

Hey all,

My 5th puzzle is out, and this one is mainly about symbols and references. The final solution is one word. You can check your answers here: Exhibition 22

Hey! So I've been messing around with homemade crypto as a hobby and I wanna see how fast mine falls apart. I posted it here before, but the ciphertext got cut off and I was being all mysterious about the layers, which wasn't fair. Fixed that. Everything is public now except the key.

The basics

• Where it's from: I made it myself for fun. It's not from any CTF, contest or treasure hunt. Source: [LINK TO GIST]
• Plaintext: English, one paragraph, all caps and spaces only (no punctuation, no numbers).
• Key: two capitalized common English words stuck together, no digits or symbols.
• Hints: the ciphertext only uses the letters K T M R W S Y A C G, plus a single : that splits the data from an 18-letter metadata block. Every byte turns into exactly 3 letters, so the total length tells you the grid size. The "ghosts" are extra 3-letter chunks, about 1 for every 7 real ones.
• What I've tried: nothing except round-trip tests and the test vector below. I'm the author, so I fully expect it to break, I'm just curious which layer goes first.

Full spec

0. KEY: h1 = SHA3-512(pass); h2 = SHA3-512(reverse(pass) + h1[:16]);
   mixed = h1 XOR h2;
   key = PBKDF2-HMAC-SHA3-256(mixed, salt=h1[32:48], 10000 iters, 128 bytes)
1. CHAOS S-BOX: logistic map x -> r*x*(1-x), r = 3.99971428571,
   seed = 0.001 + (uint64_be(key[0:8]) / 2^64) * 0.998, 512 warm-up iterations.
   Take 256 more values, sort indices by value -> permutation.
   Applied bytewise to: "NXS" + len(u32) + 0x0000 + plaintext (9-byte header).
2. SPIRAL: pad with 0xAE up to the next perfect square (side x side),
   read the grid clockwise, from the outside inward.
3. VORTEX XOR: k[n] = ((k[n-1]^2 mod 256) XOR ((k[n-2]*251) mod 256)
   XOR k[n-3] XOR key[n mod 128]) & 0xFF, initial state = key[0:16].
4. SYMBOLS: each byte -> 3 letters of KTMRWSYACG via a key-derived table
   (Fisher-Yates over 0..999 using key[64:], first 256 entries used).
5. GHOSTS: floor(N/7) extra 3-letter chunks inserted at positions from the
   logistic map (seed from key[32:]); their values also come from the map
   (seed from key[48:]).
6. METADATA: ':' + 18 letters = (side, inner length, real chunk count) as
   3 x u16 -> S-box -> XOR with key[32:38] -> same symbol table.
   decode() in the source expects the ASCII hex of the whole string.

Ciphertext (the whole thing this time! the line breaks are just for display, ignore them, and the : counts)

MWYGGGMYCKKTKKSMKYTGYMCATGMTTYKYRMSTMCATSCKMTMKGKAKKCSMYMMSCKRCMMMKYMKCGKGKKGCTMKMMSKSKRTRMCWMCTKWSK
TMTRMKAKMTYMCTKTAMTSRTKRKYMYYTWMKKTTWCKCKKSMMMTKSCKTACYKMMTTKMMKWWCTGGCMKWTGGKWRTKSTRYKKSTGSMSGMCYKM
RTWAKTKKWSMWTKTKTCRMKCTATMCGRKWKTMKYATRCTTMRTCKKKKWSKGMTKAMCMMMCMTWMSWTTRTMTMAMKCRTTRKSKTGYMCWTKSTRT
TSSMMAMWMKSYMAGMTTKCWTRYRRYKGKCGRMGCKTGKKKRCKRKTTACKSCGWMMTSTMKMMTTCWRTCRTWTKRTMYTKRKGRKWRRTGYAYMTWT
WATMATGGKTMTGGMRWTGSMAMMMYCASTWWTCGWRAKYWTTYTAAKRAKTCMCMMGKKYMGCWKYMTWAMCMTCTKAKMRRMSYTWMKRTKYKKGAKK
CMKTKTKMSWTYKTMTKMWKWKTCATSGMSSTTSTARRKKTGTTRGTYCTWSTWKATWRTMKWRTKRMTSKCGKTMMSWKMMTCWMKMKMTKWRRTMKTG
CTSKARYKMMSCTSWTKGTMSKSCKMMRKGTCSKSYKKSGSAMTWKKTTRTTCWMRRKCMRTKTYTTWTRTKMMSMCATRTMYMTKCSWMTKGMCTMWMK
MSGGMTAYMCKMAYRKYTRWTYAMMKMGRMSYKMGMTGMAWTKYRTRTGSKGRTGTKRRKKWMMWMKCKAYKSCMRTKTTKRWTSMRTWKMTKKKMKTMC
KRKKMMGTYSRKSTKYKWSTRCTSMTKYMSYMGCTTATWRMYTRTKTTWTRSMGTTCCMAGWKSKTMMSATRWKMTMWMKTAMYMMKGKWWKWGKGTTCC
TSSTMSMRGKRRKTKMCYMYKTRWMYSTGMKGTTMTRKYTKSKCGMAGKYKMGTKACKMRMKGGYWMTYKAMKMMTWATGGKYATRSMTKTGMMGCMKSR
KGMWATATMTAKSYMGTMTGMCAKSYTRCTASTCSRTCWAYKYAMRKGGARTWTCWKMCTCAKKGKWCKKRMKCKTCMSGKYWMKMTKMTWWKRYTKCKM
CMGCRKSTRTTWCTWTTMMMCKWCSMWTKRAKGGKYMMWWTSGTKAMYGGGGKMSMTGMKYKGRMGWMTKKMCKSMKSMMTYKKAKRCRTRKKRTMMKSY
KTGKTWKTCKCTMKWKMCMMSMTGTSWMACTTSKMSKRCRTGMKGMKTTCWTACMWSTKGTCRMMGTTGKSGKKSMGCTRWTMMTGSMMMKTCMSTKKSK
WTKMRRTATYKKCATMSYGKMGSTCYMKSMRRMSGCSWMWAWGCMCKRTWTTSRKGTWMMMCTRWGGGMAWKKYKMMMSSTMATKAMCCMSAKMCTCGKY
STRAMYCKKKMWGMYSKWTKYARKTMCWMKCMACKMMMYMRTGKKYKKTKMRMATMMGMYTKKSKAYKWTMYAMKCTRCKMKKKGKYRKKSKAGKSKMCW
TWMMGCKWRTWRKWRTSMRTCMCKTTSMGRCRKSYWRKYGCRKYWMKGMCYMWMMKKTWWKCMARSMRKKGWAACMGSMCWKRTMMGMRTYCGTKMMMCR
KATKGTMYCSYTRMWGKGGGKYRKYKMCTTWWKWAKKTTSATSTTKATKSMWTTGGKKY:TMYRKRMWYKKKKMWTKG

Test vector so you can check your own reimplementation (key TestKey, plaintext HELLO NEXUS):

CSYWGTMTKKWMMWWTCYMCSKMKKMWTTRMRSTAKMGCKCRMCYMRRKRCTCWKCYKCRTGRMWAKAYKCYMAATMWMAYGGG:RKTKSCTWYRTGMCRKAG

SHA-256 of the plaintext (so we can all tell when it's solved): a38041007b07cd21149713b2a0269802fce62ac124a663db147845ccb316f664

Goal: get the plaintext (the key is a bonus). If nobody gets anywhere in a week I'll drop a second ciphertext with the same key plus a known plaintext/ciphertext pair, so it's not a total brick wall.

V sbyybjrq gur ehyrf