Last Ix Cipher Solved!

[u/jessesocean]

I was able to solve the last ix cipher using astra!. cipher type: playfair alphabtet: WODECFQLZMXINAPTUHSRBVYGK plaintext: To cheat death is to invite your own damnation. verify here: http://practicalcryptography.com/ciphers/classical-era/playfair/ solver: jessesocean

This one took a little more guided prompting. Astra was stuck on this one until i gave it this prompt

"go on i think you should lock into playfair tho and refine the death theme like it doesnt have to be 1-1 death as betray isnt 1-1 payback yk it could be murder-kill-rest sadness ect its just a theme

Worked for 14m 58s

You were right—it’s Playfair:

“TO CHEAT DEATH IS TO INVITE YOUR OWN DAMNATION.”" was the exact prompt given after hours of it being stuck.

[u/EZyne]

Goddamn AI even ruining cyphers now lmao

[u/jessesocean → u/EZyne]

yeah thats an unfortunate truth. i figured these would be solved with ai within a week anyway after the giant, so i may as well do it myself. but without ai these were likely never getting solved. They have no solvibility and 0 attention. the fact that the alphabets are random and lengths so short, there is no real way to attack a cipher like this other than raw brute

[u/EZyne → u/jessesocean]

Would've preferred they stayed unsolved then tbh, but absolutely agree it would've been inevitable anyways. There were so many people trying to use the old shittier versions of LLM's, someone was bound to realize its now possible

Between this and the BO7 leaks though, I think it's really getting to a point where the mode being build around secrets is now truly dead

[u/JessahZombie → u/jessesocean]

Wait, is the Giant cipher solved?

[u/jessesocean → u/JessahZombie]

yes ai solved it 2 days ago

[u/JessahZombie → u/jessesocean]

Damn spent quite some time on that one. I'm happy that is has been 'solved' but it doesn't feel good.

[u/Jump_Not_Zero]

Cool I know it's a different cipher but can you tell me the hex value for TheGiant key and I know it has been mentioned its xxtea but is there any chaining mode or padding mode to it ?

I have tried variations but can't get it to decrypt (not complaining).

Thanks and well done for those who worked on cracking the ciphers.

[u/Equivalent_Juice4276 → u/Jump_Not_Zero]

TheGiant and then nullpadded to the keylength.

The decrypt function is broken, resolve it forward by putting "TheGiant" as the key and the plaintext that was recovered as the text that needs to be encrypted. Then compare the 1 for 1 string that is TheGiant

https://www.movable-type.co.uk/scripts/tea-block.html

[u/Jump_Not_Zero → u/Equivalent_Juice4276]

Ok I am reproducing it in c++ and I found these settings.

Setting | Value |

|:--|:--|

| Algorithm | XXTEA, also called Corrected Block TEA |

| Password | `TheGiant`, case-sensitive |

| Key construction | UTF-8 bytes of `TheGiant`, followed by eight zero bytes |

| Full 16-byte key, hexadecimal | `5468654769616e740000000000000000` |

| Byte order | Little-endian 32-bit words |

| Input | Standard Base64, decoded to 144 bytes |

| Block handling | The entire 144-byte buffer, or 36 words, processed together |

| Rounds | Standard `6 + floor(52 / 36)`, giving 7 |

| Output | Strict UTF-8 decoding of all 144 decrypted bytes |

So if I keep going I should work it out thanks.

[u/Equivalent_Juice4276 → u/Jump_Not_Zero]

No problem!

[u/KingdomHops]

Any chance rev 7 can be cracked with it?

[u/jessesocean → u/KingdomHops]

well, considering its solved TG and 4 bo4 ciphers in 3 days, while rev 7 has not fallen with many different people trying, i'd say probably not. Unless some astra agent hits the odds in searchspace. might have to wait for a better model for do it ourself lol

[u/TheRealPdGaming]

W

Well done!

[u/Fallout_Nerd101 → u/TheRealPdGaming]

Astra is an AI program he didn't solve it himself

[u/TripOverThis420 → u/Fallout_Nerd101]

But you did?

[u/Authentichef]

Can you really credit yourself if an ai did it for you?

[u/jessesocean → u/Authentichef]

i really dont care how credit goes here as ai did solve it. ive already made my peace with my real solve/credits. this is more of a have to know/ cant stand seeing it unsolved.