[DCTF Quals 2018] Message
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: 
Full content:
1
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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:
Second example:
Third example:
After replacing the above strings with spaces (“ “), you obtain the following:
By searching for “{“ or “}” we can obtain the exact block of the flag. Also note that numbers or spaces are not substituted.
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:
By mapping all blocks to our keyboard we can obtain all letters in this encoding. Therefore there is an almost perfect decryption tool:
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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 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Example run:
The flag is: DCTF{b66ecaaa90ad05df5dab33d71a8f70934408f3a5847a4c5c38db75891b0f0e32}
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