TAMUCTF – RSAPWN

Oregon State University Security Club

TAMUCTF – RSAPWN

Prompt

We must train the next generation of hackers.

nc challenges.tamuctf.com 8573

Solution

It looks like this just asks us to find the two “big prime” factors of the number provided, and return them. Athos’ script does exactly that:

python3 ./exploit.py 
[+] Opening connection to challenges.tamuctf.com on port 8573: Done
b'We must train future hackers to break RSA quickly. Here is how this will work.\nI will multiply together two big primes (<= 10000000), give you the result,\nand you must reply to me in less than two seconds telling me what primes I\nmultiplied.\n\nPress enter when you are ready.\n'
num b'99981300873901'
9999083 9999047
b'Good job :)'
b'gigem{g00d_job_yOu_h4aaxx0rrR}'
b''

Nice!

gigem{g00d_job_yOu_h4aaxx0rrR}

~Athos, Lyell Read

 

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