Quartz sync: Sep 20, 2024, 11:44 AM

challenge.py

@@ -1,50 +0,0 @@
-'''
-p = 97
-g = 31
-
-a = 97 (random number from p-10 to p, both included)
-b = 22 (random number from g-10 to g, both included)
-
-u = g^a mod p
-u = 31
-
-v = g^b mod p
-v = 54
-
-key = v^a mod p
-key = 54
-
-b_key = u^b mod p
-b_key = 54
-
-So, shared_key = key = b_key = 54
-
-semi_cipher = dynamic_xor_encrypt(flag, "trudeau")
-cipher = encrypt(semi_cipher, shared_key)
-'''
-cipher = [151146, 1158786, 1276344, 1360314, 1427490, 1377108, 1074816, 1074816, 386262, 705348, 0, 
-          1393902, 352674, 83970, 1141992, 0, 369468, 1444284, 16794, 1041228, 403056, 453438, 100764, 
-          100764, 285498, 100764, 436644, 856494, 537408, 822906, 436644, 117558, 201528, 285498]
-
-def decrypt_semi_flag(key):
-    semi_flag = ""
-    for chr_cipher in cipher:
-        x = chr(chr_cipher // (key*311))
-        semi_flag += x
-    return semi_flag
-
-def dynamic_xor_decrypt(semi_flag, key): 
-    flag = ""
-    key_length = len(key)
-    for i, char in enumerate(semi_flag):
-        key_char = key[i % key_length]
-        decrypted_char = chr(ord(char) ^ ord(key_char))
-        flag += decrypted_char
-    return flag
-
-semi_flag = decrypt_semi_flag(54)
-flag = dynamic_xor_decrypt(semi_flag, "trudeau")
-print(flag[::-1]) # unreverse the flag
-
-
-

content/index.md

@@ -1,6 +1,6 @@
 ---
 title: CTF Writeups
-modified: 2024-09-11T22:15:40+08:00
+modified: 2024-09-20T11:44:54+08:00
 ---
 
 ![[banner.jpg]]
@@ -13,7 +13,7 @@ modified: 2024-09-11T22:15:40+08:00
 Welcome to my Capture The Flag (CTF) writeups page! Here you'll find detailed explanations and solutions to various CTF challenges I've tackled. 
 ## The Ongoing Journey 💡
 
-As of **11 September 2024**, this CTF-writeups page has a total of **98** writeups across different topics. As I continue to explore and glean deeper insights, this project will remain a living document, constantly evolving and improving. Regular updates will be made to refine the content, introduce fresh perspectives, and integrate the latest knowledge. Stay tuned for ongoing enhancements!
+As of **20 September 2024**, this CTF-writeups page has a total of **102** writeups across different topics. As I continue to explore and glean deeper insights, this project will remain a living document, constantly evolving and improving. Regular updates will be made to refine the content, introduce fresh perspectives, and integrate the latest knowledge. Stay tuned for ongoing enhancements!
 ## Navigation 🗺️
 
 ### PicoCTF