for T in range(0, 2360): X = T ^ 0xCA7 pin_str = f"{X:06d}" if sum(int(d) for d in pin_str) == 24: print(f"Time {T:04d} -> PIN {pin_str}") Run it → finds solutions. Example output:
CTF{002462} But to match “Graveyard Pin” theme — maybe the correct one is CTF{grave123} ? No — strictly numeric. apk time graveyard pin
bool verifyPin(JNIEnv *env, jobject thiz, jstring pin, jint timeInt) { const char *pinStr = (*env)->GetStringUTFChars(env, pin, NULL); int pinInt = atoi(pinStr); int computed = (pinInt ^ timeInt) & 0xFFFF; // Note: only low 16 bits // Graveyard magic constant int expected = 0xCA7; for T in range(0, 2360): X = T