initial commit

源码/source/task-src/plain.py

@@ -0,0 +1,35 @@
+# flag{9bc74ce3-a56d-467f-eb52-d5f3d8923c6f}
+
+__humor_enter__()
+
+try:
+    from hashlib import sha256
+    from functools import reduce
+
+    flag = input('Enter your flag: ')
+
+    group_1 = [
+        int.from_bytes(flag[1::3].encode(), 'big') % 998244353 == 156881262,
+        sha256(flag[-16:].encode()).hexdigest().endswith('dcf56476457880bf5b39b295416f267b7a636324baeae1fd'),
+        reduce(lambda x, y: x ^ y, map(ord, flag)) == 2,
+    ]
+
+    if not all(group_1):
+        print('Wrong')
+        exit(1)
+
+    acc = 0
+    for i in flag:
+        i = ord(i) ^ 0x55
+        acc |= i
+        acc <<= (7 if i & 1 else 8)
+
+    if acc == 27473331342481820165679397757145329260017933200691317902624657196062576436414763023083043884214272:
+        print('Right')
+    else:
+        print('Wrong')
+        exit(1)
+
+except:
+    print('Stop reverse engineering me, enjoy your day :)')
+    exit(1)