Re: Poor man's encrypted data

[Björnke von Gierke]

I made this script for fun once, and transmit it as yet another 
somewhat secure method (yassm). Use if you want to, but beware of the 
shortness of the randomSeed, its only integer, so you only use the 
first 4 to 5 chars of the password with this. Also the size of the data 
increases a lot. The method uses a random number which you can change 
in addition to the password; both must match to decrypt the info again. 
I never tried binary data with this.

--encryption button:
on mouseUp
  --transform password to a number
  repeat for each char theChar in field "password"
    put chartonum(theChar) after password
  end repeat
  --set the random generator to it (only first 4 to 5 chars matter)
  set the randomSeed to password
  --translate each char to a number
  repeat for each char theChar in field "input"
  --field "randomNumber" is a previously set number
    put ( random(field "RandomNumber")  + chartonum(theChar)) & return 
after theEncoded
  end repeat
  --output
  put theEncoded into field "encrypted"
end mouseUp

--decryption:
on mouseUp
  repeat for each char theChar in field "password"
    put chartonum(theChar) after password
  end repeat
  set the randomSeed to password
  repeat for each line theLine in field "encrypted"
    put numtochar(theLine - random(field "RandomNumber")) after 
theDecoded
  end repeat
  put theDecoded into field "decrypted"
end mouseUp

On Sonntag, Apr 6, 2003, at 03:29 Europe/Zurich, Monte Goulding wrote:

So with that out of the way, we're back to the original question:
 for what
uses would a hard-to-break but not military-grade encryption be
acceptable?
Hi Richard

I faintly remember that the password protection is 128 bit encryption 
so I
assume it's equivalent to SSL in it's strength. I think this is the 
reason
the US Government won't let MC/Rev be exported to some countries. I 
guess
the critical thing is that you make it difficult for someone to work 
out the
passkey. Once that's public then you offer no protection at all.

By the way I think Rev does this for their order form so that's one 
use.

Regards

Monte

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