A method and system for performing a security authentication. A name of a user, N sequences of digits, and encrypted values respectively corresponding to the digits in the N sequences are transmitted to a destination device. Each sequence includes a same M unique digits and begins with a different digit, wherein N≧2 and M≧3. N encrypted values of the transmitted encrypted values are received, wherein an Ith received encrypted value of the N received encrypted values corresponds to one of the digits selected by the user, at an electronic device, from a respective Ith sequence of the N sequences (I=1, 2, . . . , N). N digits respectively corresponding to the received N encrypted values are determined. The determined N digits form a number matching a PIN associated with the name of the user, which authenticates the user to access a resource.