TJCTF2020 - RSABC

Posted on mar. 02 juin 2020 in CTF • Tagged with hack, learn, ctf, tjctf, 2020, cryptography, rsa, rsactftool, python

solves : 415

Written by boomo

I was just listening to some relaxing ASMR when a notification popped up with this.

???

Hint: It's easy as R-S-A! Wait.. 

We have this informations:

n=57772961349879658023983283615621490728299498090674385733830087914838280699121
e=65537
c=36913885366666102438288732953977798352561146298725524881805840497762448828130

Ok, it's RSA. The challenge name and the informations confirm it. We can …


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HackTM Quals20 - Prison Break

Posted on mer. 05 février 2020 in CTF • Tagged with hack, learn, ctf, hacktm, quals, 2020, rsa, cryptography, looking

solves : 92

Prison Break
119 Points

Author: FeDEX

Your friend has been captured by some country's secret services and is being held in a prison. Having reached the prison, you realise there is a code there that you need to break.
The enemies have been kind enough to leave …

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HackTM Quals20 - RSA is easy #1

Posted on mer. 05 février 2020 in CTF • Tagged with hack, learn, ctf, hacktm, quals, 2020, rsa, cryptography

solves : 279

RSA is easy #1
50 Points

Author: stackola

challenge_files.zip a6ba5325c1a34910db0f4e8cce82f5bd

We got two files in the zip:

$ zipinfo challenge_files.zip 
Archive:  challenge_files.zip
Zip file size: 5533 bytes, number of entries: 3
drwxr-xr-x  3.0 unx        0 bx stor 20-Jan-15 17:07 challenge_files/
-rw-r--r--  3.0 …

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HackTM Quals20 - RSA is easy #2

Posted on mer. 05 février 2020 in CTF • Tagged with hack, learn, ctf, hacktm, quals, 2020, rsa, cryptography

solves : 157

RSA is easy #2
50 Points

Provide the flag in this format:

HackTM{words_you_found}

Example:
If you find "i am a flag"
submit:
HackTM{i_am_a_flag}

Author: stackola

challenge_files_2.zip bebe0b93b184fd375c3462488c9fde01

Same as RSA is easy #1, we have exactly the same python script but with a new c …


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RTCP - Growls at the chicken

Posted on sam. 25 janvier 2020 in CTF • Tagged with hack, learn, ctf, rtcp, rice, tea, cat, panda, rsa, encrypt, website, gif, js

solves : 38

Point : 1000

grrrrrrR
big chicken, i hisS At you!!!

hint: 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
hint 2: Public [...]
hint 3: Private [...]

Ok, We have a base64 encoded message with …


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