Backdoor CTF 2017

Dead-PNG-2 - ?? [300 pts] [Not Solved]

n00b accidentally found a corrupted zlib/png file, help him to recover the secret code from the file.

Solution:

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Complex RSA - Crypto [200 pts] [Not Solved]

n00b heard that single RSA encryption can be cracked sometimes due to bad implementation, so he encrypted the message twice. See if you can break it.

Solution

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ECB - Steg [150 pts] [Not Solved]

n00b learnt about ECB and has encrypted some images with it. Can you find the flag?

Solution

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ImageRev - Crypto [200 pts] [Not Solved]

Reverse the encrypted file and recover the flag

Solution

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NoCalm - Rev [350 pts] [Not Solved]

h3rcul35 and starlord were having a heated conversation and to c00l down the furious starlord, h3rcul35 gave him a binary and said "The binary takes each 'character' byte of the flag as argument. Given this info, grab the flag. I hope you dont get angry :P". Show h3rcul35 that you stayed c00l by finding the flag.

Solution

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Stereotype - Crypto [300 pts] [Not Solved]

n00b is so sure that no one can crack his message and in this foolishness he even provided a part of plaintext. You know what you have to show him

Solution

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