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Official Broken Decryptor Discussion

htbapibothtbapibot
in Challenges

Official discussion thread for Broken Decryptor. Please do not post any spoilers or big hints.

Comments

  • FukurouFukurou

    Very nice challenge. Took me a bit of time to realize that I was doing things right just was missing one extra step to recover everything.

    If what I said helped you you can always send some respects ^^

  • snugglessnuggles
    edited January 25

    Very good challenge.

    snuggles

  • p00dl3p00dl3

    Will the decrypt function never work?

  • xtalxtal
    edited January 31

    @p00dl3 said:

    Will the decrypt function never work?

    My result: a really "broken decryptor".

  • arg1arg1

    Fun challenge. Thx r4j! Forces you to understand MODE_CTR...(not a spoiler)

  • brigantebrigante

    hi could someone give me a hint in DM?

  • p00dl3p00dl3

    Cant seem to break this, the randomness after each encryption makes it seem impossible to crack

  • FukurouFukurou

    @p00dl3 said:
    Cant seem to break this, the randomness after each encryption makes it seem impossible to crack

    Are you sure it is totally random?

    If what I said helped you you can always send some respects ^^

  • maple3142maple3142

    Just solved the challenge, but it requires a long time and lots of requests to get flag. Is that normal, or that is intended?

  • mysteriousPmysteriousP

    I cannot yet discover how to get hid of the otp... Is it necessary to try to discover a prediction on the random bytes sequence?

  • xtalxtal

    @mysteriousP Read carefully the otp... generation and understand all steps of the generation. Fukurou and indirect maple3142 gives already very good hints.

  • mysteriousPmysteriousP

    Wohay! Finally i got it...
    But, i wanted to discuss the method, because i think i made it in a naive way...
    I'm thinking: if i could use some concurrency i should get better result?

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