a simple game

encryption and decryption is an everlasting subject at computer domain.

There is a story to make you understand encryption and decryption.

I am very curious about chalk using by teacher when i am an schoolchild . some day, I steal a chalk. But I am afraid of being found. So I wrap it using paper to puzzle my teacher and classmates. I take it home and detach paper. so I get chalk.

This story is an analogy. Chalk means information and wraping paper means encryption and detaching paper means decryption.

we encrypt information to ensure no one knows information except us. we decrypt it then read it.

But how encrypt information? There are too many simple and complex way. We give some example.

English get 26 letter a b c d ... z. So there is a simple way. 1 represent a, 2 represent b, 3 represent c, ..., 26 represent z.

what abc will become to using this way? abc become to 123. but i have a habit to keep first letter. i like a123 not 123. do you like it?

let us see another way.

this way means similar shape between English letter and Arabic numerals. i and j is similar with 1(one). o is similar with 0(zero). z is similar with 2(two). and other letter is themselves.

okay, using this way, what password will become to?

by the way, I like this word form which first letter is lowercase and other letter is uppercase. such as aBCD. do you like it?

and I am like using email not QQ communicate with my friend.

oh, these are all serious topics. let us have a relaxed topic.

I have a friend whose name is vietnam.

vietnam work at yahoo company. He like first letter lowercase just like me. he is my best friend, i hope you like him.

you must know what I mean. i expect you detach paper. and tell me what i mean.