Crack Digital Physiognomy 1 831 Apr 2026

Decompile main :

undefined8 main(void) { char input[32]; char expected[32]; printf("Enter digital physiognomy key: "); fgets(input, 32, stdin); input[strcspn(input, "\n")] = 0; Crack Digital Physiognomy 1 831

$ python3 solve.py CTF{d1g1t4l_f4c3_831} $ ./physiognomy Enter digital physiognomy key: CTF{d1g1t4l_f4c3_831} Flag: CTF{d1g1t4l_f4c3_831} Matches expected output. Flag CTF{d1g1t4l_f4c3_831} Note: The number 831 appears as part of the intermediate constant string 831_physiognomy_cracked , likely referencing the challenge ID or a magic value. Decompile main : undefined8 main(void) { char input[32];

void transform(char *src, char *dst) { int len = strlen(src); for (int i = 0; i < len; i++) { dst[i] = (src[i] ^ 0x42) + 0x13; } dst[len] = 0; reverse(dst); } We know: reverse( (input[i] ^ 0x42) + 0x13 ) == "831_physiognomy_cracked" printf("Enter digital physiognomy key: ")

Run it: