Image of DCTF Quals 2018

Description:

I just typed this secret message with my new encoding algorithm.

Author:

Lucian Nitescu

Stats:

50 point / 87 solvers

Solution:

The challange started with the following fille: Image of Message DCTF Quals 2018

Full content:

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The above given text is encoded with a some kind of substitution algorithm. Also we can observe that some part are repeating themself.

First example:

Image of Message DCTF Quals 2018

Second example:

Image of Message DCTF Quals 2018

Third example:

Image of Message DCTF Quals 2018

After replacing the above strings with spaces (“ “), you obtain the following:

Image of Message DCTF Quals 2018

By searching for “{“ or “}” we can obtain the exact block of the flag. Also note that numbers or spaces are not substituted.

Image of Message DCTF Quals 2018

From that flag format we know that “wsxcfe” is the letter “D” and if we take a look at our keyboard, we get the following information:

Image of Message DCTF Quals 2018

By mapping all blocks to our keyboard we can obtain all letters in this encoding. Therefore there is an almost perfect decryption tool:

import random

keyboard = [
[["a"],["xcvbgrd", "grdxcvb", "zsefvcx"]],
[["b"],["wsxcfd", "rfvbhg", "qazxds"]],
[["c"],["redcv", "ewsxc", "trfvb"]],
[["d"],["edcvgr", "wsxcfe", "yhnmku"]],
[["e"],["edcvrf", "wsxcde", "tgbnhy"]],
[["f"],["redcf", "trfvg", "ewsxd"]],
[["g"],["redcvg", "cvgred", "cvrged"]],
[["h"],["wsxdrfv", "edcftgb", "rfvgyhn"]],
[["i"],["wsx", "edc", "rfv"]],
[["j"],["ujmn", "wsxz", "rfvc"]],
[["k"],["edcfby", "wsxdvr", "qazsce"]],
[["l"],["wsxcv", "edcvb", "rfvbn"]],
[["m"],["zaqwdrtgb", "xsweftyhn", "xsweftynh"]],
[["n"],["zaqwdvfr", "xsweftgb" , "xsweftbg"]],
[["o"],["qazxcdew", "wsxcvfre", "rfvbnhyt"]],
[["p"],["mnbvccdertg", "nbvcxswerf", "nbvcxswefr"]],
[["q"],["qazxcdewv", "edcvbgtrn", "rfvbnhytm"]],
[["r"],["mnbvcdrtghu","mnbvcdrtghu","mnbvcdrtghu"]],
[["s"],["ytrfvcx", "iuyhnbv", "iuyhnbv"]],
[["t"],["wertyfv", "rtyuihn", "rtyuihn"]],
[["u"],["wsxcvfr", "edcvbgt", "edcvbgt"]],
[["v"],["efvgy", "wdcft", "wdcft"]],
[["w"],["efvgywdcft","efvgywdcft","efvgywdcft"]],
[["x"],["wdvtdz", "rgnygc", "rgnygc"]],
[["y"],["jmyi", "efvt", "efvt"]],
[["z"],["qwerdcvb", "ertgvbn", "ertgvbn"]]
]

def nliqwerty_enc(buf):
	enc_buf = ""
	x = 0
	y = 0
	for char in buf:
		for count in range(0,26):
			if (char.lower() == keyboard[count][0][0]):
				# print char.lower() + " / " + keyboard[count][1][random.randint(0, 2)]
				enc_buf += keyboard[count][1][random.randint(0, 2)]
				y = 1
				x = 0
			else:
				if y == 0:
					x = 1
		if x == 1:	
			enc_buf += char.lower()
		enc_buf += random.choice(["qwerty", "asdfgh", "zxcvbn"])
		x = 0
		y = 0
		
	return enc_buf

def nliqwerty_dec(buf):
	dec_buf = ""
	dec_buf = buf.replace("qwerty", "#")
	dec_buf = dec_buf.replace("asdfgh", "#")
	dec_buf = dec_buf.replace("zxcvbn", "#")
	chars = dec_buf.split("#")
	dec_buf = ""
	for x in chars:
		if len(x) == 1:
			dec_buf += x
		else:
			for count in range(0,26):

				if x == keyboard[count][1][0]:
					dec_buf += keyboard[count][0][0]
					
				if x == keyboard[count][1][1]:
					dec_buf += keyboard[count][0][0]
				
				if x == keyboard[count][1][2]:
					dec_buf += keyboard[count][0][0]
	print dec_buf

print "-=====-"
nliqwerty_dec("wsxcvasdfghrfvbnhytqwertymnbvcdrtghuzxcvbnwsxcdeasdfghzaqwdrtgbzxcvbn qwertywsxqwertynbvcxswefrqwertyiuyhnbvqwertywsxcvfrasdfghzaqwdrtgbzxcvbn qwertywsxasdfghiuyhnbvasdfgh zxcvbnytrfvcxqwertywsxasdfghzaqwdrtgbqwertymnbvccdertgzxcvbnedcvbasdfghefvtzxcvbn asdfghwsxcfezxcvbnedcvbgtasdfghzaqwdrtgbqwertyxsweftynhzxcvbnjmyizxcvbn zxcvbnrtyuihnzxcvbnwsxcdeasdfghrgnygcqwertyrtyuihnasdfgh qwertyqazxcdewzxcvbnredcfzxcvbn zxcvbnwertyfvzxcvbnrfvgyhnasdfghwsxcdeqwerty qwertynbvcxswefrzxcvbnmnbvcdrtghuzxcvbnrfvqwertyxsweftgbqwertyrtyuihnqwertywsxasdfghxsweftgbzxcvbncvgredasdfgh asdfghgrdxcvbzxcvbnxsweftbgasdfghwsxcfeqwerty asdfghwertyfvqwertyefvtqwertynbvcxswefrqwertyedcvrfzxcvbnytrfvcxzxcvbntgbnhyasdfghwertyfvasdfghwertyfvzxcvbnwsxqwertyzaqwdvfrzxcvbncvgredqwerty asdfghedczxcvbnxsweftbgasdfghyhnmkuzxcvbnedcvbgtqwertyiuyhnbvqwertyrtyuihnasdfghmnbvcdrtghuqwertyjmyiasdfgh.zxcvbn asdfghrfvbnqwertywsxcvfreasdfghmnbvcdrtghuqwertywsxcdeasdfghzaqwdrtgbasdfgh asdfghwsxqwertynbvcxswerfqwertyiuyhnbvzxcvbnedcvbgtzxcvbnxsweftyhnqwerty qwertyrfvgyhnasdfghzsefvcxqwertyytrfvcxasdfgh qwertyrfvbhgasdfghedcvrfasdfghtgbnhyasdfghxsweftgbasdfgh asdfghrtyuihnqwertyedcftgbasdfghtgbnhyasdfgh zxcvbnrfvasdfghzaqwdvfrasdfghwsxcfezxcvbnedcvbgtqwertyytrfvcxzxcvbnrtyuihnasdfghmnbvcdrtghuzxcvbnefvtzxcvbn'asdfghiuyhnbvzxcvbn qwertyiuyhnbvzxcvbnrtyuihnqwertyzsefvcxasdfghzaqwdvfrqwertyyhnmkuqwertyzsefvcxzxcvbnmnbvcdrtghuqwertyedcvgrzxcvbn zxcvbnwsxcfeqwertyedcvbgtasdfghxsweftynhasdfghxsweftyhnzxcvbnefvtqwerty zxcvbnrtyuihnzxcvbntgbnhyqwertywdvtdzasdfghwertyfvzxcvbn asdfghtgbnhyqwertywdcftasdfghedcvrfasdfghmnbvcdrtghuqwerty zxcvbniuyhnbvzxcvbnrfvqwertyxsweftgbzxcvbnewsxczxcvbnwsxcdezxcvbn qwertywertyfvqwertyedcftgbzxcvbnedcvrfzxcvbn asdfgh1qwerty5zxcvbn0asdfgh0qwertyiuyhnbvzxcvbn,qwerty zxcvbnefvgywdcftzxcvbnedcftgbasdfghwsxcdeqwertyxsweftgbzxcvbn zxcvbngrdxcvbasdfghzaqwdvfrqwerty 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Example run:

Image of Message DCTF Quals 2018

The flag is: DCTF{b66ecaaa90ad05df5dab33d71a8f70934408f3a5847a4c5c38db75891b0f0e32}