encryption

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Re: Let's learn assembly!

 
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  #1
Dec 8th, 2008
emergent;help i a project in encryption any text of alphapets and numbers into a random characters(from A-Z and 0-9 numbers)
using assembly
if u please
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Re: encryption

 
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  #2
Dec 9th, 2008
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encryption any text of alphapets and numbers into a random characters
; do you want later to decrypt it back or no?
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Re: encryption

 
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  #3
Dec 9th, 2008
yes encryption and decryption code
and reading the text from a text file
thanks
Last edited by raseel; Dec 9th, 2008 at 9:53 am.
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Re: encryption

 
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  #4
Dec 9th, 2008
Start simple - write a program which just copies the file, one character at a time.

Until you can do that reliably, there's no point trying to implement a crypt/decrypt, because you'll have no way to test it.
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Re: encryption

 
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  #5
Dec 9th, 2008
; here is a simple encrypting/decrypting app.:
; on encryption it will just inc hex values represented byeach char
; on decryption dec
Assembly Syntax (Toggle Plain Text) 
  1. 	.386
  2. 	.model flat,stdcall
  3. 	option casemap:none
  4. 	include \masm32\include\windows.inc
  5. 	include \masm32\include\user32.inc
  6. 	include \masm32\include\kernel32.inc
  7. 	include \masm32\include\masm32.inc
  8. 	includelib \masm32\lib\user32.lib
  9. 	includelib \masm32\lib\kernel32.lib
  10. 	includelib \masm32\lib\masm32.lib
  11.  
  12. .data?
  13. 	szBuff				db  256 dup(?)
  14. .code
  15. start:
  16. invoke AllocConsole
  17. invoke StdIn, ADDR szBuff, sizeof szBuff
  18.  
  19. lblCrypt:
  20. mov eax, offset szBuff
  21. @@:
  22. cmp byte ptr [eax],0
  23. je lblPrint
  24. inc byte ptr [eax]
  25. inc eax
  26. jmp @B
  27.  
  28. lblPrint:
  29. mov eax, offset szBuff
  30. invoke	StdOut, ADDR szBuff
  31.  
  32. lblDecrypt:
  33. mov eax, offset szBuff
  34. @@:
  35. cmp byte ptr [eax],0
  36. je lblExit
  37. dec byte ptr [eax]
  38. inc eax
  39. jmp @B
  40.  
  41. lblExit:
  42. mov eax, offset szBuff
  43. invoke	StdOut, ADDR szBuff
  44. invoke	ExitProcess, 0
  45. end start
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Re: encryption

 
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  #6
Dec 10th, 2008
thanks a lot .but it is only allowed for me to use TASM for 8086 ,and u here used MASM ,it is a little bit different could u help me to do this
thanks again
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