1. Encrypting Long Numbers
If I had a (randomly generated) number like this:
12847-47844-37847-38475
what process/algorithm could I use to encrypt it such that when a person
reads it to me I can run it through a program and read the result back to
them such that it would unlock the program for them to use it?
2. Re: Encrypting Long Numbers
Sounds like a one way hash.
C. K. Lester wrote:
>
>
> If I had a (randomly generated) number like this:
>
> 12847-47844-37847-38475
>
> what process/algorithm could I use to encrypt it such that when a person
> reads it to me I can run it through a program and read the result back to
> them such that it would unlock the program for them to use it?
>
3. Re: Encrypting Long Numbers
C. K. Lester wrote:
> > If I had a (randomly generated) number like this:
> >
> > 12847-47844-37847-38475
> >
> > what process/algorithm could I use to encrypt it such that when a person
> > reads it to me I can run it through a program and read the result back
to
> > them such that it would unlock the program for them to use it?
Lucius Hilarious replied:
> Sounds like a one way hash.
Thanks, but I wanted code. :P
4. Re: Encrypting Long Numbers
Hi C. K., you wrote:
<snip>
> Lucius Hilarious replied:
>
>> Sounds like a one way hash.
>
> Thanks, but I wanted code. :P
Maybe MD5?
"MD5 is a one-way hash function which generates a 128-bit (16-byte)
representation of any sequence of bits or bytes given."
http://www16.brinkster.com/davitf/
Or maybe something else from that page?
Best regards,
Juergen
--
/"\ ASCII ribbon campain | |\ _,,,---,,_
\ / against HTML in | /,`.-'`' -. ;-;;,_
X e-mail and news, | |,4- ) )-,_..;\ ( `'-'
/ \ and unneeded MIME | '---''(_/--' `-'\_)
5. Re: Encrypting Long Numbers
----- Original Message -----
From: "C. K. Lester" <cklester at yahoo.com>
To: "EUforum" <EUforum at topica.com>
Subject: Encrypting Long Numbers
>
>
> If I had a (randomly generated) number like this:
>
> 12847-47844-37847-38475
>
> what process/algorithm could I use to encrypt it such that when a person
> reads it to me I can run it through a program and read the result back to
> them such that it would unlock the program for them to use it?
>
How long is a piece of string?
There are many many ways to do this. Your selection of an algorithm depends
on...
a) How secure does it have to be
b) How fast does it have to be
c) Do you need single key or private/public key
d) Is the program unlocked for one installation or for any installation
But aside from these considerations, do you really need 'encryption' or would a
'hash' function or 'key components' routine suffice?
I have code for all three methods (all propriatory and not 'offically
recognised' algorithms), plus code for very random numbers. You might like to
stick with standard algorithms (eg. AES for encryption, MD5 for hashing)
--
Derek
6. Re: Encrypting Long Numbers
--- Derek Parnell <ddparnell at bigpond.com> wrote:
> > If I had a (randomly generated) number like this:
> >
> > 12847-47844-37847-38475
>
> But aside from these considerations, do you really
> need 'encryption' or would a 'hash' function or 'key
> components' routine suffice?
A good hash is probably all I need. Except I don't
know what a hash is from an encryption... :)
My company has used this method for a long time, but
I'm wanting to not have to reinvent any wheels. We
have to use different code because it's a new and
improved product... :)
-ck
__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com
7. Re: Encrypting Long Numbers
- Posted by gertie at visionsix.com
Jul 12, 2003
On 11 Jul 2003, at 18:22, C. K. Lester wrote:
>
>
> --- Derek Parnell <ddparnell at bigpond.com> wrote:
>
> > > If I had a (randomly generated) number like this:
> > >
> > > 12847-47844-37847-38475
> >
> > But aside from these considerations, do you really
> > need 'encryption' or would a 'hash' function or 'key
> > components' routine suffice?
>
> A good hash is probably all I need. Except I don't
> know what a hash is from an encryption... :)
In mirc, type:
/help hash tables
Kat
8. Re: Encrypting Long Numbers
Try this CK:
include sha1.e -- http://www16.brinkster.com/davitf/
include b64.e --
http://www.rapideuphoria.com/cgi-bin/asearch.exu?gen=3Don&keywords=3DLoma=
x
sequence t, fluff, txt
-- I assume you send it as an ascii sequence:
t=3D"12847-47844-37847-38475"=20
fluff=3D"Now CK would be real silly"&t[1..6]&
"if he just left this here,"&t[7..12]&
"instead of replacing it by"&t[13..18]&
"something only he knows .."&t[19..23]
txt=3Dencode64(sha_1(fluff))
printf(1,"%s\n",{txt})
-- ... send that back ...
if not equal(decode64(txt),sha_1(fluff)) then
puts(1,"error\n")
end if
if getc(0) then end if
Providing no-one else knows what it is you do to build fluff (which
obviously needs to be the same at both ends), that should be pretty
tough to break.
Pete
