#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
	unsigned char data[20] = {};

	srand(time(0));
	for (int i = 0; i < 20; i++) {
		data[i] = rand() % 256;
	}
	for (int i = 0; i < 20; i++) {
		printf("%02X ", data[i]);
	}
	printf("\n");

	return 0;
}