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Distinguishing Encrypted Data From Random Data?

gust5av writes "I'm working on a little script to provide very simple and easy to use steganography. I'm using bash together with cryptsetup (without LUKS), and the plausible deniability lies in writing to different parts of a container file. On decryption you specify the offset of the hidden data. Together with a dynamically expanding filesystem, this makes it possible to have an arbitrary number of hidden volumes in a file. It is implausible to reveal the encrypted data without the password, but is it possible to prove there is encrypted data where you claim there's not? If I give someone one file containing random data and another containing data encrypted with AES, will he be able to tell which is which?"

18 of 467 comments (clear)

  1. Re:iieorjoeghoiuhtr by Anonymous Coward · · Score: 4, Funny

    Trick question! It is random text that's been encrypted!

  2. Re:Lifting the Lid on the Guilty Yid by ian(at)union.io · · Score: 2, Funny

    Let me guess... Random!.. No, wait, too obvious. Encrypted!

  3. Re:iieorjoeghoiuhtr by bennomatic · · Score: 2, Funny

    Nice. "All your base are belong". You purposely left off the last two words to give a smaller sample to review and potentially recognize patterns.

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  4. Re:Well by bennomatic · · Score: 5, Funny

    Weird. I guess I there's a bug in my ROT13 implementation. If I run my text through twice, I just get the original message.

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  5. Re:It's all about entropy by biryokumaru · · Score: 2, Funny

    From now on, whenever I go on a flight I'm bringing several DVDs of random data.

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  6. Re:Well by SeanTobin · · Score: 5, Funny

    Weird. I guess I there's a bug in my ROT13 implementation. If I run my text through twice, I just get the original message.

    Just do what they did with DES... use 3rot13 and you're much more secure than the original implementation.

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  7. Sure, you have to use... by Anonymous Coward · · Score: 1, Funny

    Math.

    Be sure to use some math and it'll all be good

  8. Re:Ignore the person holding the phone book. by Suki+I · · Score: 2, Funny

    I see a market in in automated phone book whacking gadgets! Look for them soon on ThinkGeek.

  9. Re:Ignore the person holding the phone book. by sjames · · Score: 2, Funny

    They will need to give it a significant civilian use, so it should come with an attachment that lets you beat the marketing department and PHBs to death with a paper towel roller.

  10. Re:iieorjoeghoiuhtr by Volante3192 · · Score: 3, Funny

    Looks Welsh...

  11. NSA? Bah. by denzacar · · Score: 3, Funny

    I don't work for any 3-letter agency and even I could easily get the information needed.
    With the right tools.

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  12. Re:Ignore the person holding the phone book. by M.+Baranczak · · Score: 5, Funny

    they aren't going to drug / beat every single person coming onto an airplane

    If you fly US Airways, there's a $25 service charge if you want to get beaten and drugged before boarding. I remember when that shit used to be included in the base ticket price.

  13. Re:Ignore the person holding the phone book. by Jeremi · · Score: 4, Funny

    If your jpgs look like everybody elses jpgs both visually and under close analytical scrutiny they aren't going to bother you.

    I've developed a fascinating algorithm for encoding hidden data by slightly modulating breast sizes, but this comment is too small to contain it.

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  14. Re:It's all about entropy by AK+Marc · · Score: 2, Funny

    When they discover you aren't a scientist, live in your mothers basement, and have never held a job, they'll arrest you for obstruction of justice.

  15. Re:One more level... by lgw · · Score: 4, Funny

    But a good defense attorney would apply the same principle to show that the prosecution's legal submissions were really steganography hiding insults to the judge's mother.

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  16. Re:No, you ALL miss the point. by pipedwho · · Score: 2, Funny

    You tell them you just visited your cousin Jim, who had an old hard drive he didn't want anymore, and you needed a spare so he gave it to you, but not before he ran "dd if=/dev/urandom of=/dev/sda1" because he didn't want you having his old tax documents. All you've done with it since is install the OS...

    ...and a copy of Truecrypt into Program Files.

  17. Re:iieorjoeghoiuhtr by Mitchell314 · · Score: 5, Funny

    Dammit, I finally get cthulu back to sleep and some jackass wakes him up again.

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  18. Re:It's all about entropy by Menkhaf · · Score: 2, Funny

    Better yet: Make it compressed headerless video. Claim you're recording Uranus.

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