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Stuff to do while you wait (with a message from Harry added)

The Empty Vault Forums Bureau of Security and Signals Intelligence Forum Stuff to do while you wait (with a message from Harry added)

  • This topic has 57 replies, 12 voices, and was last updated 3 weeks ago by cribbage.
Viewing 14 posts - 46 through 59 (of 59 total)
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  • #87801
    madness
    Participant

    @Mattyrat. No. YOU explain to ME how the two encryptions are different.

    [No shouting in the Library! Harry]

    #87825
    Mattyrat2027
    Participant

    @Madness Hmph okay then.

    From what I gather:
    My best guess would be that the alphabet is still in order, but the number of characters to each letter of the alphabet is weighted for the frequency of that letter in English. for example, ‘z’ would have one letter mapped to it, but ‘e’ would have far more. I think the idea is to have relatively even frequency distribution to make attack by frequency analysis harder.

    Please do confirm or deny

    #87830
    madness
    Participant

    @Mattyrat. Look closely at your own encryption. You have missed the difference.

    #87832
    madness
    Participant

    Look, here I reencrypted your text with your own key. Compare it to your ciphertext. They are not the same. Your scripts are broken.

    JA3 1G4G47 EUC5 GY CW F WFGERB RFE73 YZHXEHFQ ACXY3 H3RCQ7GQK JC F OEUYO3ECXY 5FQZWFSJXE3E GJ AFY F NUU1 YCRG1 WXE4GJZE3 UW JA3 O3EGU1 JA3 N343EFR 3WW3SJ GY F YZHYJF4JGFR FQ1 A3F0GRB VU5WCEJFHR3 HXJ 4UJ VUYB FQ1 AC53RG63 GW F E3FRGYJGS Y3J GY ZY31 JA3Q GJ YACZR1 H3 Y8XQK HFSI FY GJ 8FY G4 JA3 OEC1XVJGU4 FJ JA3 438 JA3FJE3 HB 1UGQ7 JAGY BCX SFQ AFL3 JA3 1G4GQKJFHR3 V3QJE3 1U84YJFN3 1XEGQ7 FSJ CQ3 8A3Q GJ GY Q33131 JA3E3 FQ1 JA3Q Y8G4KGQN HFS6 VFQ E303FR JA3 WGE3ORFS3 WCE FVJ J8C F41 JA3Q WCE FVJ JAE33 VFQ YAU8 F Y5FRR JFHR3 8GJA F J3R3OACQ3 U4 GJ 1C8QYJFK3 UW JA3 WGE3ORFS3 F41 HB JAGY JG53 JA3 1G4GQ7JFHR3 FQ1 GJ SAFGEY AFM3 5UP31 83RR ZOYJFN3 OEU1XV3EY 8AU 8GYA JU F0UG1 JAGY JEGV6B HXYGQ3YY 8AGSA GQLURL3Y J8U E3Y3JJGQKY CW JA3 YS3Q3 FQ1 YC53 L3EB FVSZEFJ3 F1DZYJ53QJY CW JA3 39JEF WRFJY Q3S3YYFEB 8UXR1 H3 83RR F1MGY31 JC 1GYO34Y3 8GJA FQ CE1GQFEB E3FRGYJGS Y3J GW U4RB H3VFZY3 JA3 1GQGQNJFHR3 H3VC53Y F QXGYFQV3 JA3 RG7AJG4N YAUXR1 H3 OGQI FQ1 G4JG5FJ3 Z4JGR JA3 GQYO3SJUE FEEGP3Y F41 JA3Q GJ YACXR1 H3 HEGKAJ3E F41 AFE13E

    #87845
    Mattyrat2027
    Participant

    Sorry @Madness, I’m lost. All I wanted to know was how the homophonic substitution cipher works and how to crack one, but I can’t work out where I’m going wrong. I see differences in the texts, but I don’t know what that means.

    #87847
    madness
    Participant

    @Mattyrat, homophonic means there are several CHOICES for how to encrypt a letter, using ONE at a TIME. You did it by using ALL of them EACH TIME.

    I’m allowed to yell in the library, because I have a medical exemption.

    #87852
    cribbage
    Participant

    If you were expecting some kind of Culper-based challenge for Mission 10, I have prepared a very simple one here:

    零壹零零零壹壹零零零 零零壹壹壹壹壹壹零壹 壹零壹壹零零零零壹壹 零零零零壹壹零零零零 壹零零壹壹壹壹壹零零
    壹零零壹壹壹壹零壹零 壹零零壹壹壹零零零壹 零零零零零壹零壹壹壹 零壹零零零零零零壹零 壹零零壹零壹壹零零零
    零壹壹零零零零壹壹壹 壹零零壹壹壹零壹壹零 壹零壹零壹零壹零壹零 零零零零壹壹零零零零 零壹零壹壹零壹零零零
    壹零零壹壹壹壹零壹零 零零壹壹壹壹壹零零壹 壹零零壹壹壹零零壹壹 壹零零壹零壹零壹零零 零零壹零壹壹零壹壹零
    壹零壹零壹零壹零壹零 壹零壹零壹壹零壹零壹 零壹零零零零零零壹零 壹零零壹壹壹壹零零壹 壹零零壹壹壹壹零壹零
    壹零零零壹壹零零壹零 零零零零零零零壹零壹 零零零零壹壹零零零零 零壹零零零零零零零壹

    #87857
    Mattyrat2027
    Participant

    So it isn’t a random selection of the choices, but in order? Allow me to give an example:

    E = W/Q

    Plaintext: ‘The bed’
    Ciphertext:’–W -Q-‘ (dashes represent other encrypted letters)

    Is this on the right track?

    #87864
    madness
    Participant

    @Mattyrat, elsewhere you wrote
    “I can do the rest, but I fear I haven’t enough time to do so”.
    So maybe you should finish 10B first. Then you can look up the definition of homophonic substitution if you don’t like mine,
    then take a close look at your encryption vs. my encryption.

    #87871
    The-Letter-Wriggler
    Participant

    @cribbage if you are taking MD5’s then
    MD5: 887a05e7963a9ddd5898cf6846369f7d (All uppercase, no spaces + TLW)

    #87907
    SquidSinker
    Participant

    I take it no one is up to the challenge?

    #87951
    The-Letter-Wriggler
    Participant

    @SquidSinker which challenge are you refering to?

    #87955
    cribbage
    Participant

    @TLW
    Sorry for not seeing your answer earlier. I couldn’t replicate your hash. If you generated something that (mostly) made sense, then you were probably right …

    #87956
    The-Letter-Wriggler
    Participant

    @cribbage,
    That’s ok I know that due to lack of words it was in ‘awkwark’ English but it did make good sense 🙂

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