Encrypting?

[Glen]

does anyone knows how to encrypt in basic?

[Arcane Wizard]

Encrypt what?

[Glen]

encrypt strings.......

[NETWizz]

Yes,

I have an almost perfect method; I think.
#Clear the Screen

ClrHome

#get the text to encrypt in str1

Input Str1

#Next you need a secret key let us say a number

Input A

#Seed the random number generator

A->Rand

#Create our output String; later if I am interested, I will create a routine to reencode into the same string
#I added a character becase we cannot concatnate to a null string ""
" "->Str2

#For each letter, assign a number

For(B,1,Length(Str1

#Figure out a number for each letter e.g. A=1, B=2..., assign to C
inString("ABC...Z",Sub(Str1,B,1))->C

#use the random generator the end should be the same as the maximum number of characters you use. Add it to C the letter number
RandInt(1,26)+C->C

#Make it fit e.g. 27 would loop back to 1 which is A
If C>26
C-26->C

Str2+Sub("ABC...Z",C,1)->Str2

End


I can change this to encode over the origional string, but that will take some complexity and thought, so I am not going to think about that now.

e.g.

ABCTOWNCA

replacing C with ZP would take some doing

ABZPTOWNZPA

Maybe I will work on figuring out how to do regular expressions again like I did in nimbusos b1.

[Glen]

thanks Jbirk.......... will try that!

[JoeImp]

If you'd like some more secure methods, mostly without a key, I know some nice encryptions, my favorite's 64 bit encryption.

Imp

[NETWizz]

Yeah post them!

[Flash]

*reads on in curiostsity*

(a spellcheck)

[62 52 53 53]

I always liked the idea of encryption. Mainly to stop people from messing up your stuff, not to prevent them from getting it. Although I prefer lists.

[gorchy]

a very easy way to encrypt and decrypt would be to add 13 to the number of the letter in the alphabet; so you you could use the same algorithm to encrypt and decrypt

[JoeImp]

64 bit encryption -

http://www.cpp-home.com/tutorial.php?102_1

Tutorial explained, then coded in C++.

Ummm the add 13 to the letter thing, first of all, people would break that in a second, second of all, make that .2 of a second since you just told everyone that you're gonna do that :)

Imp

[Darth Android]

what is the difference between 64 bit and 128 bit other than the level? i mean, what is the difference in the alogorithms?

[JoeImp]

Im not sure, do to me never learning 128 bit.

Imp

[JesusFreak]

Just do a layered coding (is that what 64 bit is b/c i have no idea what that is) ie.
If your message was "ABC", then you would change A to 1, B to 2, C to 3, as so on, so now our message is "123", then your layered code would change a 1 to 42. 2 to 68, and 3 to 97 (all random numbers), so now our message is "426897", then it would change 42 to 456, 68 to 273, 97 to 304, so now our message is "456273304", then it would do, 456 to 1092, 273 to 3940, 304 to 3048, so now our message is "109239403048", then you would change 0 to "a", 1 to "b", 2 to "c" and so on, (yes all lower case), so mow our message is "bajcdjeadaei", then once again it would change "a" to 1, "b" to 2, "c" to 3 and so on, so the finished message is, "2,1,10,3,4,10,5,1,4,1,5,9" (i started to put commas in so you can see the different numbers, but each one would be stored in to a list or what not) then your friend would have to put in those # (or who ever is using this), the program would then trans late the numbers back to your message of "ABC"

[Arcane Wizard]

That woudln't work unless you stored the seed of the random number generator after each change.

[JesusFreak]

you would need to store the #'s in a list, i will try it in a few mins...

[Toksyuryel]

I can encrypt pics with a random code, and then decrypt them using that same code. Anyone want the source?

[Darth Android]

i need a pic compression routine! that stores the output in a list. objective: output is 768 bytes or less...

[Toksyuryel]

I can do it in about 400 if I can just figure out how to look at individual digits in a number...

[Adm.Wiggin]

thats easy.
if you want the 100's place of : 455 (so 4) you would do (pretend thats in A and we want the 100's place in B ) :