cybersecurity · beginner · ~15 min · safe pentest lab

Single-size UID?

Classify the UID size.

Challenge

ISO14443 UIDs are 4 (single), 7 (double), or 10 (triple) bytes. Implement int uid_is_single(int len) returning 1 if len == 4, else 0.

Starter code

int uid_is_single(int len) {
    /* TODO */
    return 0;
}

Solve this exercise in the browser editor — compile and run against the test harness, no setup required.