simple encription question

[B2E]

I am sure this question is simple so it should not take you smart guys long. I have some text in a RichTextBox1 and i want to turn each character(letter) into a number then i am going to add a number to it say "1" and then save it to a file as a long set of numbers, when i want to read the info the program will subtract the number "1" and then turn the corresponding number back into a letter(character) and put them back in the richtextbox1 does anyone know how to do this? or maybe an easier way to go about it in vb .net

THANKS!!!

[Frans C]

This kind of encryption is very easy to crack.
The framework provides special classes for almost uncrackable encryption, including the rijndael algorithm, which is one of the best.

Have a look at the System.Security.Cryptography Namespace.
I think with VB.NET it is more easy to use the (good) build in encryption methods, then make one of your own.
I think you must be able to find some samples on the web. I haven't used these classes myself yet.

[B2E]

Yea i know that the original way that this would work would be easy to crack....but if i can figure out how to turn each caracter(letter) into a corresponding number or integer then (cause i love high level math) i could write an algorithm that would be very hard to crack.

If anyone knows how to turn each caracter into a srting then let me know thanks!!

[Frans C]

I believe the Asc and Chr functions still work in Vb.NET.

[Frans C]

Also the classes in the System.Text Namespace could be of help, especially the ASCIIEncoding Class.
The GetBytes method can convert a string into a byte aray.

[B2E]

O.k. if you could tell me how to pic on each little character in a string say for instance the string is "This is a test" what would the code look like to get each individual character

CODE:
for 0 to richtextbox1.text.lenght

something in here to get the first(t) then the next(h) then the next(i) and so on so forth....(s)...( )...(i)..(s)..( )...(a)...ect

next

what do i need to do to get each character one at a time if i new how to do that i think i could take it fromt here

thanks

[Frans C]

I you want to split it into single characters, you need an array of chars, but I thought you wanted to make numbers out of them, so to turn a string intom an array of bytes, you could use something like this:

not tested, I don't have VB.NET installed were I am right now.

Dim AE as new System.Text.ASCIIEncoding 
Dim MyString as String = "This is a test"
Dim bArr() as Byte
 
bArr() = AE.GetBytes(MyString)

bArr now contains the ASCII values for each character in the string (ranging from 0 to 255)

[Frans C]

Dim AE As New System.Text.ASCIIEncoding()
        Dim MyString As String = "This is a test"
        Dim AnotherString As String
        Dim bArr() As Byte
 
        bArr = AE.GetBytes(MyString)
        ' now the string "This is a test" is converted to an array of bytes
        ' so every character in the string is now a number between 0 and 255 in the array
        ' you can encrypt it now, and save it to file
        ' after reading it back from file, and decrypting it, 
        ' you can convert the bytearray back to a string like this
        AnotherString = AE.GetString(bArr)
        MsgBox(AnotherString)

[B2E]

Thanks a lot

[B2E]

ok say that i wanted to take each member in the array and add a number to it like the number 1 or 2 and then save it like that and when i open the file to read it i would subtract whatever the number i added to each member of the array was and then convert it back to a string. How would i go about doung that?

thanks agian

[CVMichael]

Why don't you use the XOR operator, you can make a pretty good encripter/decripter if you have a good imagination.... I use it a lot when I want to encript data... if you make a good algoritm with it, it's won't be easy to crack at all....

[308holes]

Example ?

[manpowre1]

http://www.planet-source-code.com/vb...=782&lngWId=10

I'm also the author of the code in this link,.

Best regards
Svein

[Pirate]

ok try my encryption example if you are looking for encryption and vice versa