#define KEY_FILE_NUM 1000

/**
* get key from file
* @param key_file
* @return
*/
DSA * getKey(char key_file[]);

BIGNUM * bignum_hash(char * str);

BIGNUM * attack(BIGNUM * s1, BIGNUM * s2, BIGNUM * h1,
   BIGNUM * h2, BIGNUM * r, BIGNUM * q);

int main(int argc, char** argv) {

char key_file [25] = "pub.pem";
DSA * dsa_key;

char str1 [] = "This is the first message";
char str2 [] = "This is the second message";
BIGNUM *y; // public key
BIGNUM *x; // private key

BIGNUM * p;
BIGNUM * q;
BIGNUM * g;

BIGNUM * s1 = BN_new();
BIGNUM * s2 = BN_new();
BIGNUM * r1 = BN_new();
BIGNUM * r2 = BN_new();

// get dsa key
dsa_key = getKey(key_file);
// get pub key
DSA_get0_key(dsa_key, & y, & x);
// get p, q and g
DSA_get0_pqg(dsa_key, &p, &q, &g);

// calculate r and s
BN_dec2bn(&r1,
         "55983321957179334990776807302553602022183292023424726751359557576360865358737");
BN_dec2bn(&s1,
         "83369469688984422295778435155296819959433974624241834285401031004727531119835");
BN_dec2bn(&r2,
         "55983321957179334990776807302553602022183292023424726751359557576360865358737");
BN_dec2bn(&s2,
         "37493297085917018237891904494957722083645528010879630668071853943102661599931");

// we note that r1 = r2
// then the k value of both signatures is the same

// hash value of each string
BIGNUM * h1 = bignum_hash(str1);
BIGNUM * h2 = bignum_hash(str2);

Which is more difficult to secure: wireless or wired networks? Why?...