z13_poc_1.py

"""
$ python z13_poc_1.py
MATCHING CIPHER LINE
>VUZ5-+|c.3zBK(Op^.fMqG2RcT+L16C<+

MATCHING CIPHER LINE MIRRORED
<VUZ5-+|C.4zbk(OP^.FMQG2rCT+l16c>+

MATCHING CIPHER LINE MIRRORED DECIPHERED
I O S R V S H E Y N E A E I T A I O N F O Q T M r Y R H A R D E N H
"""

import re

import numpy as np

left_right = {
    None: "Z",
    "!": "!",
    "#": "#",
    "%": "*",
    "&": None,
    "(": "(",
    ")": ")",
    "*": "%",
    "+": "+",
    "-": "-",
    ".": ".",
    "/": "\\",
    "0": None,
    "1": "1",
    "2": "2",
    "3": "4",
    "4": "3",
    "5": "5",
    "6": "6",
    "7": "7",
    "8": "8",
    "9": "9",
    ":": ";",
    ";": ":",
    "<": ">",
    "=": "=",
    ">": "<",
    "?": "?",
    "@": "@",
    "A": "A",
    "B": "b",
    "C": "c",
    "D": "d",
    "E": "e",
    "F": "f",
    "G": None,
    "H": "H",
    "I": "I",
    "J": None,
    "K": "k",
    "L": "l",
    "M": "M",
    "N": None,
    "O": "O",
    "P": "p",
    "Q": "q",
    "R": "r",
    "S": None,
    "T": "T",
    "U": None,
    "V": "V",
    "W": "W",
    "X": "X",
    "Y": "y",
    "Z": None,
    "\\": "/",
    "b": "B",
    "c": "C",
    "d": "D",
    "e": "E",
    "f": "F",
    "k": "K",
    "l": "L",
    "p": "P",
    "q": "Q",
    "r": "R",
    "y": "Y",
}


z340_key = {
    "A": ["K", "*", "z", "O", "l"],
    "B": ["f", "_"],
    "C": ["p"],
    "D": ["S", "A", "6"],
    "E": ["|", "B", "b", "4", "c", "N"],
    "F": ["F"],
    "G": ["L"],
    "H": ["+"],
    "I": ["H", "k", "<", "P", "y"],
    "J": [],
    "K": [],
    "L": ["d", "7", "t"],
    "M": ["2"],
    "N": [".", "9", ">", "D", "Y"],
    "O": ["M", "V", "R", "^"],
    "P": ["8", "j"],
    "Q": [],
    "R": ["E", "Z", "1", "T"],
    "S": ["U", "&", "J", "-"],
    "T": ["(", "#", "G", "%", ";", ":"],
    "U": ["@", "/", "q"],
    "V": ["5"],
    "W": ["W", ")"],
    "X": [],
    "Y": ["C", "3", "X"],
    "Z": [],
}


def load_z340(fix=True):
    z340 = r"""
        HER>pl^VPk|1LTG2d
        Np+B(#O%DWY.<*Kf)
        By:cM+UZGW()L#zHJ
        Spp7^l8*V3pO++RK2
        _9M+ztjd|5FP+&4k/
        p8R^FlO-*dCkF>2D(
        #5+Kq%;2UcXGV.zL|
        (G2Jfj#O+_NYz+@L9
        d<M+b+ZR2FBcyA64K
        -zlUV+^J+Op7<FBy-
        U+R/5tE|DYBpbTMKO
        2<clRJ|*5T4M.+&BF
        z69Sy#+N|5FBc(;8R
        lGFN^f524b.cV4t++
        yBX1*:49CE>VUZ5-+
        |c.3zBK(Op^.fMqG2
        RcT+L16C<+FlWB|)L
        ++)WCzWcPOSHT/()p
        |FkdW<7tB_YOB*-Cc
        >MDHNpkSzZO8A|K;+
    """
    lines = [list(y) for y in (x.strip() for x in z340.split("\n")) if y]
    if fix:
        lines[14] = list("yBX+1*:49CE>VUZ5-")
    return np.array(lines)


def substitute(key, alias):
    for letter, aliases in key.items():
        if alias in aliases:
            return letter


def find_z13_pattern(cipher):
    z13_pattern = re.compile(".{13}K.{6}M.{13}")
    return z13_pattern.findall("".join(cipher.flatten()))


def demo():
    z340 = load_z340(fix=False)
    matching_lines = find_z13_pattern(cipher=z340)
    second_line = matching_lines[1]
    plaintext = []
    line_mirror = []

    print("MATCHING CIPHER LINE")
    print(second_line, "\n")

    for char in second_line:
        char_mirror = left_right.get(char) or char
        line_mirror.append(char_mirror)

    print("MATCHING CIPHER LINE MIRRORED")
    print("".join(line_mirror), "\n")

    for char_mirror in line_mirror:
        char_plain = substitute(key=z340_key, alias=char_mirror) or char_mirror
        plaintext.append(char_plain)

    plaintext = " ".join(plaintext)
    print("MATCHING CIPHER LINE MIRRORED DECIPHERED")
    print(plaintext)

    assert "T M r Y R H A R D E N" in plaintext


if __name__ == "__main__":
    demo()