Question

How alphanumeric code is useful in digital computers ?

Answer 1

In computer security  alphanumeric shellcodeis a shellcode that consists of or assembles itself on execution into entirely alphanumeric ASCII or unicode characters such as 0-9, A-Z and a-z. This type of encoding was created by hackers to hide working machine code inside what appears to be text. This can be useful to avoid detection of the code and to allow the code to pass through filters that scrub non-alphanumeric characters from strings (in part, such filters were a response to non-alphanumeric shellcode exploits).

Answer 2

In order to communicate, we need not only numbers, but also letters and other symbols.In the stictest sense alphanumeric codes are codes that represent numbers and alphabetic characters .Most such codes however also represent other character such as symbols and various instruction necessary for conveying information.