TJCTF challs

README.md

@@ -2387,7 +2387,11 @@
             <td><a href="https://ctftime.org/event/2361/tasks/" target="_blank">CTFtime</a></td>
         </tr>
         <tr>
-            <td rowspan=3><a href="ctfs/TJCTF">TJCTF</a></td>
+            <td rowspan=4><a href="ctfs/TJCTF">TJCTF</a></td>
+            <td><a href="ctfs/TJCTF/2024">2024</a></td>
+            <td><a href="https://ctftime.org/event/2321/tasks/" target="_blank">CTFtime</a></td>
+        </tr>
+        <tr>
             <td><a href="ctfs/TJCTF/2023">2023</a></td>
             <td><a href="https://ctftime.org/event/1865/tasks/" target="_blank">CTFtime</a></td>
         </tr>

ctfs/TJCTF/2024/README.md

@@ -0,0 +1 @@
+[CTFtime Page](https://ctftime.org/event/2321)

ctfs/TJCTF/2024/crypto/accountleak/README.md

@@ -0,0 +1,3 @@
+vninja007
+
+Uncrackable password? I thought this was a CTF; get me my friends minecraft password pls <3

ctfs/TJCTF/2024/crypto/accountleak/server.py

@@ -0,0 +1,47 @@
+#!/usr/local/bin/python3.10 -u
+
+import time
+from Crypto.Util.number import getPrime, getRandomInteger, getRandomNBitInteger
+
+flag = open("flag.txt").read().strip()
+p = getPrime(512)
+q = getPrime(512)
+
+sub = getRandomInteger(20)
+
+# hehe u cant guess it since its random :P
+my_password = getRandomNBitInteger(256)
+
+n = p*q
+c = pow(my_password, 65537, n)
+dont_leak_this = (p-sub)*(q-sub)
+
+
+def gamechat():
+    print("<Bobby> i have an uncrackable password maybe")
+    print(f"<Bobby> i'll give you the powerful numbers, {c} and {n}")
+    print("<Bobby> gl hacking into my account")
+    print("<Bobby> btw do you want to get my diamond stash")
+    resp = input("<You> ")
+    if (resp.strip() == "yea"):
+        print("<Bobby> i'll send coords")
+        print(f"<Bobby> {dont_leak_this}")
+        print("<Bobby> oop wasnt supposed to copypaste that")
+        print("<Bobby> you cant crack my account tho >:)")
+        tic = time.time()
+        resp = input("<You> ")
+        toc = time.time()
+        if (toc-tic >= 2.5):
+            print("<Bobby> you know I can reset my password faster than that lol")
+        elif (resp.strip() != str(my_password)):
+            print("<Bobby> lol nice try won't give password that easily")
+        else:
+            print("<Bobby> NANI?? Impossible?!?")
+            print("<Bobby> I might as wel give you the flag")
+            print(f"<Bobby> {flag}")
+    else:
+        print("<Bobby> bro what, who denies free diamonds?")
+    print("Bobby has left the game")
+
+
+gamechat()

ctfs/TJCTF/2024/crypto/alkane/README.md

@@ -0,0 +1,3 @@
+stosp
+
+I hate standing in line for gas....

ctfs/TJCTF/2024/crypto/alkane/output.txt

@@ -0,0 +1,2 @@
+m: bytearray(b'yellow submarine')
+c: b'\xb7\x8e\xb3\xd9\xfd\xf2\x1f\xa2\xeaz\xe3\x0f\x00xj\x08'

ctfs/TJCTF/2024/crypto/assume/README.md

@@ -0,0 +1,3 @@
+samarth
+
+assume for the sake of contradiction that pet the catloe