Ex11 - Classical Encryption

Every letter in computer has own ASCII code

Ex11 - Classical Encryption

ASCII code is a code that represents different letter even Chinese word in computer

Ex11 - Classical Encryption

The traditional encryption is to convert every letter of a message to be ASCII code and perform some calculation to become a encrypted message

Ex11 - Classical Encryption

For example, we know that the ASCII code for letter "a" is 97, then we can convert "a" to be 97 and plus 3 become 100, the 100 in ASCII code represents letter "c", so that the encrypted message for the "a" is "c".