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  • polyenc

    From Stefan Claas@21:1/5 to All on Sat Mar 2 10:55:59 2024
    Hi all,

    a little test to convert cipher text to
    .SVG poly lines and back.

    The first image used my adiantum cipher,
    the second my ff1 cipher and the third
    image is openssl rand -hex 32.

    Hope you like the idea!

    The images can be found in the german (binary)
    Usenet group (avialable for all, I guess)
    de.alt.dateien.misc, with the following M-IDs:

    Subject: adantium cipher
    <urus5n$1qce4$1@stefan.eternal-september.org>

    Subject: ff1 cipher
    <urus7a$1qce4$2@stefan.eternal-september.org>

    Subject: openssl rand -hex
    <urus8h$1qce4$3@stefan.eternal-september.org>

    Regards
    Stefan

    P.S. I think we can use this Newsgroup for all
    our binary crypto output, or files, because it
    says dateien(=files).misc ... ;-)

    --
    ----Ed25519 Signature---- e3117be00a0f16bdf1663ef9e72a75fed2b7535cec0f1bb7832789b537dc523d 4120ad6c0aabef791a9023997acf2487e934a12a12c6f19ddf3fcc6fa67dad0b

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  • From Stefan Claas@21:1/5 to Stefan Claas on Sat Mar 2 12:44:21 2024
    Stefan Claas wrote:

    Hi all,

    a little test to convert cipher text to
    .SVG poly lines and back.

    The first image used my adiantum cipher,
    the second my ff1 cipher and the third
    image is openssl rand -hex 32.

    Here is how the images look, as .png:

    https://postimg.cc/gallery/hhSHWpF

    Regards
    Stefan
    --
    ----Ed25519 Signature---- dd5747f79f72ac3714febab9608831707f5045fdd9805d2e241bf965d33fe0a3 2f895eb3b435cd1aebc57c3acae676f9b3c9fb314a2e0c8b18ae8392d85d3207

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  • From Richard Harnden@21:1/5 to Stefan Claas on Sat Mar 2 13:10:39 2024
    On 02/03/2024 09:55, Stefan Claas wrote:


    P.S. I think we can use this Newsgroup for all
    our binary crypto output, or files, because it
    says dateien(=files).misc ... ;-)


    No, please, no binaries.

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  • From Doc O'Leary ,@21:1/5 to Stefan Claas on Sat Mar 2 15:50:00 2024
    For your reference, records indicate that
    Stefan Claas <pollux@tilde.club> wrote:

    a little test to convert cipher text to
    .SVG poly lines and back.

    Back when *owning* DVDs were a thing:

    <https://en.wikipedia.org/wiki/AACS_encryption_key_controversy>

    This image was cooked up with a similar idea:

    <https://datafetish.com/images/sinister_plot.jpg>

    I like the update of using SVG. It makes it easier to get data out, but
    also might make it more obvious that there *is* data to get out. And, honestly, there is so much room for steganography in SVG that a proper
    encoder could pack it in much more densely than simple line drawings.

    --
    "Also . . . I can kill you with my brain."
    River Tam, Trash, Firefly

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  • From Stefan Claas@21:1/5 to All on Sat Mar 2 17:27:40 2024
    Doc O'Leary , wrote:

    For your reference, records indicate that
    Stefan Claas <pollux@tilde.club> wrote:

    a little test to convert cipher text to
    .SVG poly lines and back.

    Back when *owning* DVDs were a thing:

    <https://en.wikipedia.org/wiki/AACS_encryption_key_controversy>

    This image was cooked up with a similar idea:

    <https://datafetish.com/images/sinister_plot.jpg>

    Ah, nice! :-)


    I like the update of using SVG. It makes it easier to get data out,
    but also might make it more obvious that there *is* data to get out.

    Yes me too, but how if one embeds the vector graphic in another .svg file
    like an invisible watermark (a transparent object). Maybe worth to
    explore?

    And, honestly, there is so much room for steganography in SVG that a
    proper encoder could pack it in much more densely than simple line
    drawings.

    I just found this example:

    https://github.com/japplebaum/svgsteg

    Regards
    Stefan
    --
    ----Ed25519 Signature---- 8c98dfe11de6e415362446a7f6b0c843c9d257769ca5d022cc233a8c3049c572 0494f6ea837777c5e6796208af32dca6ee7a81e38f317733e76f025fe6fbbb02

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  • From Stefan Claas@21:1/5 to Richard Harnden on Sat Mar 2 17:29:58 2024
    Richard Harnden wrote:

    On 02/03/2024 09:55, Stefan Claas wrote:


    P.S. I think we can use this Newsgroup for all
    our binary crypto output, or files, because it
    says dateien(=files).misc ... ;-)


    No, please, no binaries.

    I did non mean to post there binary versions of programs,
    but binary output, like an encrypted message, or image is
    fine there, I would say.

    Regards
    Stefan
    --
    ----Ed25519 Signature---- ede2027a80d9532ee98c89df496114e19c613877175d39c48df01167ee8aa260 574b768a6876ec9edc32edf01c79186a9acf07c3759bca6b7836ea02e955d90e

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  • From Stefan Claas@21:1/5 to Chax Plore on Sun Mar 3 00:01:32 2024
    Chax Plore wrote:


    https://archive.org/details/cryptographylang00lang - see book pages 8
    and 9 (PDF pages 20 and 21).

    Nice! Thank you!

    Regards
    Stefan
    --
    ----Ed25519 Signature---- 233a18227d82d23f3804f47572051e2c7426ac773cae291db73e25e4e3f7083c 1ba40429a7c75e67207c3ae551fa2ef7153d6695c891a579c10b03c61f3ea501

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  • From Chax Plore@21:1/5 to Stefan Claas on Sat Mar 2 23:46:41 2024
    https://archive.org/details/cryptographylang00lang - see book pages 8
    and 9 (PDF pages 20 and 21).


    On 2024-03-02 10:55, Stefan Claas wrote:

    a little test to convert cipher text to
    ..SVG poly lines and back.



    --

    -----BEGIN PGP PUBLIC KEY FINGERPRINT-----
    5745 807C 2B82 14D8 AB06 422C 8876 5DFC 2A51 778C
    ------END PGP PUBLIC KEY FINGERPRINT------

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  • From Doc O'Leary ,@21:1/5 to Stefan Claas on Sun Mar 3 22:38:17 2024
    For your reference, records indicate that
    Stefan Claas <pollux@tilde.club> wrote:

    Yes me too, but how if one embeds the vector graphic in another .svg file like an invisible watermark (a transparent object). Maybe worth to
    explore?

    Once you just start jamming data into “out of band” spaces in file formats it doesn’t feel as interesting an exercise. It’s also a big red flag to anyone who *is* suspiciously inspecting the contents.

    https://github.com/japplebaum/svgsteg

    I’ve also never been a big fan of using only one bit of each number like that. To my thinking, it doesn’t make much sense to have an “imperceptible” difference to some reference file, because that inherently introduces a possible validity check. “Nice image of Tux you’ve got here. Any reason it doesn’t hash to the publicly available version that everyone else uses? Let’s continue this investigation in a more formal
    setting . . .”

    I was thinking of something that used as many bits as possible. The “image” may render more like a Jackson Pollock painting or some other abstract artwork, but the numbers/data there in plain sight, and *meant*
    to be seen, so you couldn’t be accused of hiding anything. I mean, yeah, they could just as easily lock you up if they wanted to, but I think the plausible deniability is greater when the data is as unstructured as
    possible.

    --
    "Also . . . I can kill you with my brain."
    River Tam, Trash, Firefly

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  • From Stefan Claas@21:1/5 to All on Mon Mar 4 17:05:06 2024
    Doc O'Leary , wrote:

    I was thinking of something that used as many bits as possible. The “image” may render more like a Jackson Pollock painting or some other abstract artwork, but the numbers/data there in plain sight, and
    *meant* to be seen, so you couldn’t be accused of hiding anything. I
    mean, yeah, they could just as easily lock you up if they wanted to,
    but I think the plausible deniability is greater when the data is as unstructured as possible.

    I tried with colored rectangles, but then when decoding not all data
    was written. I then changed to circles with a random fill color and
    black border and now it works. The program tells the user that the hex
    input string must be of even pairs (for x,y coordinates) and if odd it
    prints an error message to stdout.

    Regards
    Stefan
    --
    ----Ed25519 Signature---- 8a209aa55569ace635554dbde9cd94947e044bd65255949e66218b70e8f6aa80 e4e4325180b6f1d1de24c0cb7573f916f771dc1739f9c0a8b6ef9a1e9bc6be08

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  • From Stefan Claas@21:1/5 to Stefan Claas on Mon Mar 4 17:34:38 2024
    Stefan Claas wrote:

    I tried with colored rectangles, but then when decoding not all data
    was written. I then changed to circles with a random fill color and
    black border and now it works. The program tells the user that the hex
    input string must be of even pairs (for x,y coordinates) and if odd it
    prints an error message to stdout.

    Sample output:

    (The encoded message is: Zwölf Boxkämpfer jagen Viktor quer über den
    großen Sylter Deich.)

    Usenet Group: de.alt.dateien.misc
    M-ID: <us4su4$3832i$1@stefan.eternal-september.org>

    Regards
    Stefan
    --
    ----Ed25519 Signature---- 9b1ae01a38e1f532c50f6033a77ba0acf2272bfe26398e5c0b71770f22c2d772 007345c1bc5a9a7544a1e56d1fb0da3831a2a5c7100d1781bcb8b5327c4f7c04

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