Build your own Cryptoquip Solving Tool (Python)

Cryptoquip puzzles are a type of substitution cipher where each letter in the puzzle stands for another letter.

Install Python on your PC, you can download python from official site python.org.

Make sure that necessary libraries installed.

In this tool i used Frequency Analysis method to solve the puzzle.

Create a new file and name it Crypsolver.py and paste below code in it

import string
from collections import Counter
import tkinter as tk
from tkinter import messagebox

class CryptoquipSolver:
    def __init__(self, master):
        self.master = master
        master.title("Cryptoquip Solver")

        self.label = tk.Label(master, text="Enter Ciphertext:")
        self.label.pack()

        self.ciphertext_entry = tk.Entry(master, width=100)
        self.ciphertext_entry.pack()

        self.solve_button = tk.Button(master, text="Solve", command=self.solve)
        self.solve_button.pack()

        self.result_label = tk.Label(master, text="Decoded Message:")
        self.result_label.pack()

        self.result_text = tk.Text(master, height=10, width=100)
        self.result_text.pack()

    def frequency_analysis(self, text):
        text = ''.join(filter(lambda x: x in string.ascii_uppercase, text))
        frequencies = Counter(text)
        return frequencies

    def create_mapping(self, frequencies):
        common_letters = "ETAOINSHRDLCUMWFGYPBVKJXQZ"
        sorted_freq = frequencies.most_common()
        mapping = {}
        for i, (char, _) in enumerate(sorted_freq):
            if i < len(common_letters):
                mapping[char] = common_letters[i]
        return mapping

    def decode_ciphertext(self, ciphertext, mapping):
        decoded_message = []
        for char in ciphertext:
            if char in mapping:
                decoded_message.append(mapping[char])
            else:
                decoded_message.append(char)
        return ''.join(decoded_message)

    def solve(self):
        ciphertext = self.ciphertext_entry.get()
        if not ciphertext:
            messagebox.showerror("Input Error", "Please enter a ciphertext.")
            return

        frequencies = self.frequency_analysis(ciphertext)
        mapping = self.create_mapping(frequencies)
        decoded_message = self.decode_ciphertext(ciphertext, mapping)

        self.result_text.delete(1.0, tk.END)
        self.result_text.insert(tk.END, decoded_message)

def main():
    root = tk.Tk()
    solver = CryptoquipSolver(root)
    root.mainloop()

if __name__ == "__main__":
    main()

Save the file

Open terminal or command prompt.

Navigate to the directory where you saved the file

run script:

python crypsolver.py

Put the puzzle in textbox and hit Solve button to decode it. Get daily cryptoquip puzzle and solve it with your own tool.