keys challenge

edited January 2018 in Challenges

i solved alot of crypto challenges mostly RSA and Classic
however i'm totally blocked at this challenge
i set my mind on AES but i'm not totally sure can anyone confirm ?
i'm not familiar with AES ..
if it was really AES. is the challenge file has 2 base64 strings or just 1 ?
and obviously i need a hint please

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Comments

  • It's not base64. Not 100% sure which one it is though. I'm on this one now.

  • well .. i end up getting it using @Padovah4ck help
    for the people who still couldn't figure it out
    it's AES type encryption however it's a little uncommon type of it
    it's base64 %100 and the file contains the flag and secret word

  • edited March 2018

    @BitTheByte @Padovah4ck @n4ckhcker

    Hey, I'm trying this with a friend of mine, we're both stumped on this challenge. Any help?

    Tried sooo many modes....

    'MODE_CBC', 'MODE_CCM', 'MODE_CFB', 'MODE_CTR', 'MODE_EAX', 'MODE_ECB', 'MODE_GCM', 'MODE_OCB', 'MODE_OFB', 'MODE_OPENPGP', 'MODE_SIV', 'MODE_XTS'

    Have tried brute forcing IV's...

    The hex of the start of the enc looks little weird, so does the end, considered those might be prepended IV's or counters... but nope ... .. i'm out of ideas at this point

    xakepnz

  • hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

  • We talking about rusty nail's? lol...

    xakepnz

  • Got it! Thanks @jackshd

    xakepnz

  • @jackshd said:
    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    This hint was perfect! It took a bit of googling but I managed to find an online tool that helped solve the challenge

  • edited May 2018

    mmm, in which part of the world ? what is used as digestive and mixed to coffee in Italy is strongly different and dispersive compared to the rest of the world I bet :lol:

  • @jackshd said:
    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    How did you figure this out? Because once having that information is pretty straight forward.

    Deleite

  • @deleite said:

    @jackshd said:
    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    How did you figure this out? Because once having that information is pretty straight forward.

    Yeah! I spent aaaaaages on this - and this save me from a lot of heart ache!!
    THANK YOU!

  • edited September 2018

    @jackshd said:
    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    >

    got it :) .. Thank you for the hint ;)

  • @jackshd said:
    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    This hint helped me tremendously. Could someone share with me how one realises that it it uses that particular encryption and that particular library?

    Arrexel

  • @jackshd said:
    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    Google the hint and done ;) I hope this will hope without much of a spoiler

  • Type your comment> @solomonbston3r said:

    @jackshd said:
    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    This hint helped me tremendously. Could someone share with me how one realises that it it uses that particular encryption and that particular library?

    Did find it or not>>>

  • Type your comment> @BitTheByte said:

    well .. i end up getting it using @Padovah4ck help
    for the people who still couldn't figure it out
    it's AES type encryption however it's a little uncommon type of it
    it's base64 %100 and the file contains the flag and secret word

    How did you solve it!!

  • YEah solve it!! hahaha!!

  • @jackshd said:
    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    Your hint was on the point!!

  • Type your comment> @jackshd said:

    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    Thanks, after a quick google I easily figgured it out.

  • Type your comment> @jackshd said:

    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    Perfect, thanks for the hint!

  • Who mixes fucking alcohol with coffee? like wtf

  • Type your comment> @jackshd said:

    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    It is a perfect hint. For those who live in different part of the world it begins with f

  • Type your comment> @jackshd said:

    hint : this type of bitter is usually served as a digestif after a meal but may also be served with coffee and espresso or mixed into coffee and espresso drinks

    I solved the challenge after this tip, but could please tell us or PM me how you were able to identify the cipher involved?

  • Just as @bananabr, I solved this flag after the hint from @jackshd. But how did you identify the correct cipher?

  • @Shadowed said:
    Just as @bananabr, I solved this flag after the hint from @jackshd. But how did you identify the correct cipher?

    Quote

    We had two base64-like strings that actually not base64 encoded strings.
    I had some experience with correct alg before so I supposed it immediately.

    Alternatively, it is possible to use comparer to identify the correct cipher

    tabacci

  • Just google @jackshd comment and you will find your answer! its the perfect tip!

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