Security, Symmetric Encryption, Cryptography, Encryption.
computes the result over mod p. mac = (m1 r⁴ + m2 r³ + m3 r² + m4 r + k) mod p mac = (r (r (r (r m1 + m2) + m3) + m4) + k) mod p h = 0; h += m1; h *= r; h %= p; h += m2; h *= r; h %= p; h += m3; h *= r; h %= p; h += m4; h *= r; h %= p; mac = (h + k) % p; This seems to be quite simple, but note we