kolos z algo xdd

uczelnia/1_semestr/wprowadzenie_do_informatyki/laby/szyfrhilla.py

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+import numpy as np
+
+def letter_to_num(letter):
+    return ord(letter.upper()) - ord('A')
+
+def num_to_letter(num):
+    return chr(num + ord('A'))
+
+
+def cipher(text: str):
+    k = np.array([[3, 3], [2, 5]])
+    text_upper = text.upper().replace(' ', '')
+
+    if len(text_upper) % 2 != 0:
+        text_upper += "X"
+
+    text_number = [letter_to_num(letter) for letter in text_upper]
+
+    text_matrix = np.array(text_number).reshape(-1, 2).T
+
+    c = (k @ text_matrix) % 26
+
+    cipher_text = ''.join(num_to_letter(num) for num in c.T.flatten())
+
+    return cipher_text
+
+def decipher(text: str):
+    k = np.array([[3, 3], [2, 5]])
+    k_inv = np.linalg.inv(k)
+    text_upper = text.upper().replace(' ', '')
+
+    if len(text_upper) % 2 != 0:
+        text_upper += "X"
+
+    text_number = [letter_to_num(letter) for letter in text_upper]
+
+    text_matrix = np.array(text_number).reshape(-1, 2).T
+
+    c = (k_inv @ text_matrix) % 26
+
+    cipher_text = ''.join(num_to_letter(num) for num in c.T.flatten())
+
+    return cipher_text
+
+if __name__ == "__main__":
+    test_text = "Test"
+    cipher = cipher(test_text)
+    #decipher = decipher(cipher)
+    print("Text: ", test_text)
+    print("cipher: ", cipher)

uczelnia/1_semestr/wprowadzenie_do_informatyki/webowka/Historia internetu czy coś.md

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+- 19*69* powstała pierwsze sieć komputerowa. 69 buahahha
+- amazon pierwsza księgarnia internetowa
+- frontend bakend