public static List <int> Attack(this CipherTwo two, int c1, int c2)
{
List <int> keys = new List <int>();
Table ddt = two.GetDifferenceDistributionTable();
// TODO search greatest differences and test theirs
// ...
int[] k2_values = new int[0x10];
int key = 0x123;
for (int m1 = 0x0; m1 <= 0xf; m1++)
{
int m2 = m1 ^ 0xf;
c1 = two.Encrypt(m1, key);
c2 = two.Encrypt(m2, key);
for (int k2 = 0x0; k2 <= 0xf; k2++)
{
int diff = two.SBox[c1 ^ k2, Access.Invers] ^ two.SBox[c2 ^ k2, Access.Invers];
if (diff == 0xd)
{
k2_values[k2]++;
}
}
}
return(keys);
}
public static Table GetDifferenceDistributionTable(this CipherTwo two)
{
int n = 16;
Table table = new Table(n);
for (int m1 = 0; m1 < n; m1++)
{
for (int m2 = 0; m2 < n; m2++)
{
int d1 = m1 ^ m2;
int d2 = two.SBox[m1] ^ two.SBox[m2];
table[d1, d2]++;
}
}
return(table);
}
