endianness_v2_temp

endianness_v2/sol.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+from pwn import *
+
+with open("challengefile", "rb") as f:
+    file = f.read()
+
+log.info(f"length: {len(file)}")
+
+reorder = b""
+
+for i in range(len(file)//4):
+    reorder += file[i+3:i+4] + file[i+2:i+3] + file[i+1:i+2] + file[i:i+1]
+
+log.hexdump(reorder)
+

poweranalysis_part_1/sol.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+from pwn import *
+import matplotlib.pyplot as plt
+
+address = "saturn.picoctf.net"
+port = 63821
+
+def fetch_data(message):
+    conn = remote(address, port, level="warn")
+    conn.recvuntil(b"hex: ")
+    conn.sendline(message)
+    conn.recvuntil(b"[")
+    list_string = conn.recvuntil(b"]", drop=True)
+    conn.close()
+    return [int(s.strip()) for s in list_string.split(b',')]
+
+data_array = []
+P = log.progress("fetching timing data")
+for i in range(16):
+    P.status(f"{i+1}/16")
+    data_array.append(fetch_data(b"00112233445566778899aabbccddeeff"))
+P.success("16/16 all data fetched")
+
+data = [0]*len(data_array[0])
+for i in range(len(data_array)):
+    slice = data_array[i]
+    for j, n in enumerate(slice):
+        data[j] += n
+
+plt.plot(data)
+plt.show()
+