1. Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

Can anyone solve this cipher?

Discussion in 'Programming & Webmastering' started by FordGT90Concept, May 8, 2014.

  1. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

    Joined:
    Oct 13, 2008
    Messages:
    14,109 (6.24/day)
    Thanks Received:
    3,929
    Location:
    IA, USA
    It may have typos in it and it probably says something about murder. I have a sneaking suspicion the + doesn't mean anything.
    Code:
    E>lVk1T3N+7ODY<K6yc+ZW6$HSpv!Vp+R3@+td0PPkpRFO^CF070K%3cG.L73f$+N9*@<++RFcA0-lVv+p<B-+/t|YpTK3cR|02.PF5S$N0B7!lFv02.Vt+B1I@EVZ-|.9KOvfq3c+1C+lB6+6CWPST7pFd<t&O^C>DNk9OAK+
    Frequency analysis:
    Code:
    +	14
    0	7
    3	6
    p	6
    F	6
    O	5
    7	5
    V	5
    K	5
    c	5
    .	4
    t	4
    C	4
    R	4
    P	4
    v	4
    6	4
    l	4
    B	4
    <	4
    N	4
    T	3
    1	3
    S	3
    k	3
    @	3
    -	3
    $	3
    |	3
    9	3
    2	2
    f	2
    A	2
    ^	2
    Z	2
    W	2
    E	2
    Y	2
    >	2
    D	2
    !	2
    d	2
    5	1
    I	1
    q	1
    &	1
    /	1
    H	1
    G	1
    %	1
    y	1
    *	1
    L	1
    It may not be solvable. :(
     
    Last edited: May 8, 2014
    Crunching for Team TPU
  2. the54thvoid

    the54thvoid

    Joined:
    Dec 14, 2009
    Messages:
    3,476 (1.90/day)
    Thanks Received:
    1,692
    Location:
    Glasgow - home of formal profanity
    Where is it from?
     
  3. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

    Joined:
    Oct 13, 2008
    Messages:
    14,109 (6.24/day)
    Thanks Received:
    3,929
    Location:
    IA, USA
    Zodiac Killer 340 cipher but only about half of it. It's a long story.
     
    Crunching for Team TPU
  4. the54thvoid

    the54thvoid

    Joined:
    Dec 14, 2009
    Messages:
    3,476 (1.90/day)
    Thanks Received:
    1,692
    Location:
    Glasgow - home of formal profanity
  5. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

    Joined:
    Oct 13, 2008
    Messages:
    14,109 (6.24/day)
    Thanks Received:
    3,929
    Location:
    IA, USA
    That doesn't seem credible to me. In the solve 408-cipher (mailed July 31, 1969), he used all of those characters ( L, backwards L, <, >) and they weren't directions inside the cipher, they were simply cipher characters. That's not to say he couldn't have changed it up but if you look at what he proposes, it doesn't really make any sense either. The 408-cipher had very few typos in it. It was in coherent sentences.

    What's unique about the above cipher is that, not long after he had the 340-cipher published (mailed Nov. 8, 1969), he published this (mailed April 20, 1970):
    http://www.zodiackiller.com/MyNameIsLetter.html
    He calls himself "zodiac," he clearly wants people to solve the 340-cipher, and I believe he gave his name using the same cipher to help decipher it (clearly the intent of the text leading up to the 13-cipher). The problem is, those circled 8's don't appear in the 340-cipher. They are unique to the 13-cipher. I reason that this was deliberate. Coincidentally:
    Code:
    AEN+8K8M8tNAM
    _Z_O_D_I_A_C_
    It fits like a glove and dodges all of the characters that are not in the 340-cipher. What that suggests to me is that every even index of character is junk data hiding the message. The non-junk data is what is posted above. Unlike the 408-cipher, it isn't just a little random, it is extremely random. That's what made me post this. I doubt I can solve it beyond the initial riddle. The more eyes looking at it the better.
     
    Last edited: May 8, 2014
    Crunching for Team TPU
  6. RCoon

    RCoon Gaming Moderator Staff Member

    Joined:
    Apr 19, 2012
    Messages:
    7,974 (8.16/day)
    Thanks Received:
    4,090
    Location:
    Gypsyland, UK
    My grandmother did cryptographics in the war, she always said Zodiac was a narcissist, and most of his cyphers were likely never supposed to be solved unless he wanted them to.
     
  7. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

    Joined:
    Oct 13, 2008
    Messages:
    14,109 (6.24/day)
    Thanks Received:
    3,929
    Location:
    IA, USA
    In the 408-cipher, he pseudo-copied The Most Dangerous Game by Richard Connell but, we didn't need the ciphers to tell us he's demented.

    And your grandma is right: only a narcissistic criminal would go to this length to get attention. Your average criminal doesn't send mail to journalists. At the same time, that raises doubt that the ciphers were even done by the murderer.

    I think there was only five ciphers. Only the first has been definitively solved. It's possible that he was so dismayed by the first cipher being solved in less than a week that the remaining four are simply gibberish. In his mind, they would never be solved which makes him the winner.


    I just woke up this morning thinking about it so I looked into it again.
     
    Last edited: May 8, 2014
    RCoon says thanks.
    Crunching for Team TPU
  8. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

    Joined:
    Oct 13, 2008
    Messages:
    14,109 (6.24/day)
    Thanks Received:
    3,929
    Location:
    IA, USA
    Crunching for Team TPU
  9. Jizzler

    Jizzler

    Joined:
    Aug 10, 2007
    Messages:
    3,464 (1.29/day)
    Thanks Received:
    650
    Location:
    Geneva, FL, USA
    Hmm...

    "I peed in the pool"

    You monster!
     
    RCoon says thanks.
  10. Solaris17

    Solaris17 Creator Solaris Utility DVD

    Joined:
    Aug 16, 2005
    Messages:
    17,417 (5.10/day)
    Thanks Received:
    3,716
    Location:
    Florida
    The + may not mean anything but have you considered it a vowel?
     
  11. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

    Joined:
    Oct 13, 2008
    Messages:
    14,109 (6.24/day)
    Thanks Received:
    3,929
    Location:
    IA, USA
    Yeah, e is the most common letter in the English language. The problem is that it is homophonic. There is likely to be many characters for each letter which means the most frequent letters (like e) are likely to be spread across several other characters. That's what makes it difficult to solve.
     
    Crunching for Team TPU
  12. Vario

    Vario

    Joined:
    Oct 21, 2005
    Messages:
    3,080 (0.92/day)
    Thanks Received:
    1,015
    original 340:
    [​IMG]

    edit:

    also on the previous codes cracked by Don Harding:
    To further throw cryptoanalysts off the track, Harden said, the writer used a backward "q" 16 times, in an effort to make an analyst think that stood for "e," as, indeed, Harden first thought it did.
     

Currently Active Users Viewing This Thread: 1 (0 members and 1 guest)

Share This Page