Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] VeriSign certificates 2nd Version 2nd 3rd Version number, TLS Vigenère cipher Viruses 2nd antivirus approaches behavior-blocking software countermeasures digital immune system e-mail virus generic decryption (GD) initial infection macro virus nature of phases structure types of |