Assembly

encryption

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Join Date: Dec 2008

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raseel

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Re: Let's learn assembly!

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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Join Date: Nov 2008

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low_coder

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Re: encryption

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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Join Date: Dec 2008

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raseel

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Re: encryption

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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Salem

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Void main'ers are DOOMed

Re: encryption

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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Join Date: Nov 2008

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low_coder

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Re: encryption

Dec 9th, 2008

; here is a simple encrypting/decrypting app.:
; on encryption it will just inc hex values represented byeach char
; on decryption dec

 Help with Code Tags 
 Assembly Syntax (Toggle Plain Text) 
	.386
	.model flat,stdcall
	option casemap:none
	include \masm32\include\windows.inc
	include \masm32\include\user32.inc
	include \masm32\include\kernel32.inc
	include \masm32\include\masm32.inc
	includelib \masm32\lib\user32.lib
	includelib \masm32\lib\kernel32.lib
	includelib \masm32\lib\masm32.lib
 
.data?
	szBuff				db  256 dup(?)
.code
start:
invoke AllocConsole
invoke StdIn, ADDR szBuff, sizeof szBuff
 
lblCrypt:
mov eax, offset szBuff
@@:
cmp byte ptr [eax],0
je lblPrint
inc byte ptr [eax]
inc eax
jmp @B
 
lblPrint:
mov eax, offset szBuff
invoke	StdOut, ADDR szBuff
 
lblDecrypt:
mov eax, offset szBuff
@@:
cmp byte ptr [eax],0
je lblExit
dec byte ptr [eax]
inc eax
jmp @B
 
lblExit:
mov eax, offset szBuff
invoke	StdOut, ADDR szBuff
invoke	ExitProcess, 0
end start
	.386
	.model flat,stdcall
	option casemap:none
	include \masm32\include\windows.inc
	include \masm32\include\user32.inc
	include \masm32\include\kernel32.inc
	include \masm32\include\masm32.inc
	includelib \masm32\lib\user32.lib
	includelib \masm32\lib\kernel32.lib
	includelib \masm32\lib\masm32.lib

.data?
	szBuff				db  256 dup(?)
.code
start:
invoke AllocConsole
invoke StdIn, ADDR szBuff, sizeof szBuff

lblCrypt:
mov eax, offset szBuff
@@:
cmp byte ptr [eax],0
je lblPrint
inc byte ptr [eax]
inc eax
jmp @B

lblPrint:
mov eax, offset szBuff
invoke	StdOut, ADDR szBuff

lblDecrypt:
mov eax, offset szBuff
@@:
cmp byte ptr [eax],0
je lblExit
dec byte ptr [eax]
inc eax
jmp @B

lblExit:
mov eax, offset szBuff
invoke	StdOut, ADDR szBuff
invoke	ExitProcess, 0
end start

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Join Date: Dec 2008

Posts: 10

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raseel

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Re: encryption

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