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INVXOREXP-Crypto (demonstration)

 

p.specht

INVXOREXP-Crypto is one the einfacheren XOR-Verschlüsselungsverfahren. a little bit a la Enigma, functions the whole only then sure, if one with eachone Klarnachricht too a brandneuen, never wiederverwendeten Verschlüsselungscode already übermittelt has - and of course always! The Verschlüsselungstext becomes functional verzerrt, circa its statistische Dekodierung something To erschweren. The Rest is a verzerrte, invertierte XOR-thing.
Windowtitle "INVXOREXP-Crypto":cls
var Klartext$="Zu verschlüsselnder set unbestimmter length!"
var Key$="GgG6!eD3bA<<<"
var z$="":var y$=""
var Ls&=len(Key$)
Print "\n      Klartext = ";Klartext$

whileloop len(Klartext$)

    z$=z$+chr $( (xor(255-ord(mid$(Klartext$,&Loop,1)), exp(ord(mid$(Key$,&Loop mod ls&,1))) )))

endwhile

print "\n   Cryptogramm = ";z$

whileloop len(z$)

    y$=y$+chr $( (xor(255-ord(mid$(   z$    ,&Loop,1)), exp(ord(mid$(Key$,&Loop mod ls&,1))) )))

endwhile

print "\n Entschlüsselt = ";y$
waitinput
 
Computer: Gerät, daß es in Mikrosekunden erlaubt, 50.000 Fehler zu machen, zB 'daß' statt 'das'...
05/24/21  
 




p.specht

Why XOR-Verschlüsselung uncertain is
==============================
... if one whom Schlüsseltext wiederverwendet:

1. Keytext XOR Keytext = 0

2. Plaintext XOR 0 = Plaintext

3. Cyphertext1 = Plaintext1 XOR Keytext

4. Cyphertext2 = Plaintext2 XOR Keytext

5.= 3. XOR 4. :
Cyphertext1 XOR Cyphertext2 = Plaintext1 XOR Keytext XOR Plaintext2 XOR Keytext
Cyphertext1 XOR Cyphertext2 = Plaintext1 XOR Plaintext2 XOR (Keytext XOR Keytext)
Cyphertext1 XOR Cyphertext2 = Plaintext1 XOR Plaintext2 XOR 0, (see 1.)
Cyphertext1 XOR Cyphertext2 = Plaintext1 XOR Plaintext2, (see 2.), or.:

6. Cyphertext1 XOR Cyphertext2 = Plaintext1 XOR Plaintext2 = Decodetext;

therefore:

7. Plaintext1 = Decodetext XOR Plaintext2, woraus follows:

Can Plaintext1-words guess (Zeichenhäufigkeiten of/ one Language !) and yield itself from it sinnvolle words, then yield itself further Klartexte (Plaintext 2,3,4,...), without that one whom Key at all needed!

greeting
 
XProfan 11
Computer: Gerät, daß es in Mikrosekunden erlaubt, 50.000 Fehler zu machen, zB 'daß' statt 'das'...
05/26/21  
 



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p.specht11/21/21
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