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Challenge "Advent Challenge — Part 3"

Challenge "Advent Challenge — Part 3"  

  By: admin on Dec. 21, 2017, 5:03 p.m.

What do you do, if your father and your stepmother decide to communicate only encrypted? You tape-record the messages. But what do the two of them really talk about?
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Re: Challenge  

  By: Veselovský on Dec. 21, 2017, 11:55 p.m.

Can you confirm the challenge is correct?
I computed the shared key but decryption of AES ciphertext leads to gibberish.

Re: Challenge  

  By: Yokozuna on Dec. 22, 2017, midnight

Ich habe auch den gemeinsamen Schlüssel ermittelt, aber bei dem Versuch, die Nachricht mit CrypTool 2 zu entschlüsseln kommt immer die Fehlermeldung: "Die Zeichenabstände sind ungültig und können nicht entfernt werden."

Was hat diese Fehlermeldung zu bedeuten?

Re: Challenge  

  By: Yokozuna on Dec. 22, 2017, 12:37 a.m.

Jetzt habe ich eine neue Version von CrypTool 2 installiert und nun kommt die Fehlermeldung "Das Padding ist ungültig und kann nicht entfernt werden."

Ist der verschlüsselte Text eventuell fehlerhaft?

Re: Challenge  

  By: AnLeRo on Dec. 22, 2017, 5:19 p.m.

You are right, the ciphertext is wrong. I'm very sorry, this will be corrected as soon as possible. The correct ciphertexts are:

  • english:
    86 B8 31 2D 26 F4 9E A7 2A 92 85 DE EA 1C 93 8E 8F A8 2A 00 6F E1 D8 19 52 25 E7 F6 A5 6C 7D 06 85 7B 9C D6 36 46 6D D5 03 CB 05 14 71 00 BB 11 D4 F6 39 5D FB 8F C7 8C EB CC 0C 6C 94 67 61 CC 3E 6B FF 6F 76 66 6E C2 14 27 5D 6E 5B 6A 84 9A 50 8E 6E 3B B4 CC 37 7C AF 82 A1 37 1F 6B C7 14 4C 19 D8 7C 48 28 9D 84 1E 43 E3 95 56 99 A5 C4
    -german:
    12 83 A0 BC FD 37 C3 30 F4 B5 90 37 D1 6A 97 44 57 FB 96 D9 7D 6F 3F 07 9B 6D F3 83 71 35 03 46 46 5E C4 B9 01 FE 46 0C 68 64 27 66 E2 99 92 69 F3 6C 11 14 6B A8 15 23 E5 08 7B CD BB AB F2 99 C9 54 54 FB E0 DB 34 BB F5 81 5B A3 00 E9 62 C9 B7 0A E2 CF 86 64 90 08 9D D3 F4 4D E9 38 77 4B 51 53 6A BB 0F 9B 5A 30 CF 5E 84 BE 86 89 BD 2B 71 7D DA B2 CD D8 53 33 18 E3 C3 55 F2 EC 75 B1

Best wishes,
Anna

Re: Challenge  

  By: AnLeRo on Dec. 24, 2017, 2:40 p.m.

The templates for this challenge are correct now.
The starting date was changed to Fri Dec 22, 2017 18:19, so the first solvers could get the full 2000 points.

Best wishes and merry Christmas,
Anna

Re: Challenge  

  By: Veselovský on Dec. 24, 2017, 3:06 p.m.

But the first 4 solvers solved it before the time "Fri Dec 22, 2017 18:19". That is probably why they received 0 points ;-)

Maybe you use UTC time on one place and UTC + 1 hour on the other.

…merry Christmas

Re: Challenge  

  By: AnLeRo on Jan. 4, 2018, 6:48 p.m.

The release time of the challenge has been adjusted. Therefore, the points are now distributed correctly.
We sincerely apologize for the inconvenience this may have caused. Thank you for your understanding and your patience.

Challenge Advent Challenge - Part 3  

  By: Theofanidis on July 1, 2018, 6:54 p.m.

Dear all,

I experience the same situation with Mr. Yokozuna :

I have updated to the latest version CrypTool 2.1 (Stable Build 7356.1)

I am using the template AES Cipher (Text Input)

I am using the correct text in hex and also the correct key in hex also (I checked both having space as separator or not)

I am using ECB with padding PKS7

But the template fails to decrypt, as it displays the message
"Padding is invalid and cannot be removed"

When I am using the same template, without any padding, the plaintext starts with J but the rest is gibberish.

Can I send a PM with my findings to check my solution ?

Best Regards
George Theofanidis

Re: Challenge  

  By: AnLeRo on July 1, 2018, 11:15 p.m.

Please send me a PM and I'll check your solution.
Best regards, Anna


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