DES implementation in C++ v1.0 (Data Encryption Standard)

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DES implementation in C++ v1.0 (Data Encryption Standard)

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Author: parvez (View all listings)

DES implementation in C++ v1.0 (Data Encryption Standard)
The algorithm is designed to encipher and decipher blocks of data consisting of 64 bits under control of a 64-bit key (although the effective key strength is only 56 bits). It takes a 64-bit block of plaintext as input and outputs a 64-bit block of cipher text. Since it always operates on blocks of equal size and it uses both permutations and substitutions in the algorithm, DES is both a block cipher and a product cipher.

DES has 16 rounds, meaning the main algorithm is repeated 16 times to produce the cipher text. It has been found that the number of rounds is exponentially proportional to the amount of time required to find a key using a brute-force attack. So as the number of rounds increases, the security of the algorithm increases exponentially.

File name:	48501.zip
Product homepage:	Unknown
Order page:	Unknown
Languages:	C++
Platforms:	general
Release Date:	4 October, 2006
Licence Type:	Shareware
Size:	3497 bytes
Price/fee (US$):	3.00 $
Number of downloads:	2708

User Comments

Why I can't build it
by Karl , China, on Monday Aug 27, 2007

I have download the code, and run in Visual C++ 6.0, but when i bulid it, there is a error and six warnings: Compiling... MAIN.cpp C:\karl\DES_E_D\MAIN.cpp(311) : warning C4018: '<' : signed/unsigned mismatch C:\karl\DES_E_D\MAIN.cpp(303) : warning C4101: 't' : unreferenced local variable C:\karl\DES_E_D\MAIN.cpp(368) : warning C4018: '<' : signed/unsigned mismatch C:\karl\DES_E_D\MAIN.cpp(416) : warning C4018: '<' : signed/unsigned mismatch C:\karl\DES_E_D\MAIN.cpp(361) : warning C4101: 't' : unreferenced local variable C:\karl\DES_E_D\MAIN.cpp(361) : warning C4101: 'a1' : unreferenced local variable C:\karl\DES_E_D\MAIN.cpp(425) : error C2065: 'clrscr' : undeclared identifier Error executing cl.exe. DES_E_D.exe - 1 error(s), 6 warning(s) What's the problem?
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error in DES c++ code
by FAWAD , Pakistan, on Sunday Nov 11, 2007

comment clrscr() at line 424 of the code. the error will be removed.
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clrscr() error
by Unknown, on Monday Jun 30, 2008

des in c++\main.cpp(424) : error C2065: 'clrscr' : undeclared identifier
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This is a Turbo C++ based code
by Unknown, on Wednesday Feb 27, 2008

Hi, This code is actually written on Turbo C++, if you could understand the logic of it properly, i guess u can convert it to any language. But, when u are running it in Visual C++, better remove clrscr(),getch() statements. Regards Niki
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problem in execute the code
by Emhemid Almbrouk Alallaghi , Libya north africa, on Saturday Apr 12, 2008

when the screen of execution is get in i see message that mean (the program can't execute because there is no enough resources close your applications and restart your machin )and when i do that i see the same error and why you ignore 1-//strcpy 2-//fstream("out_file) when i delete the two ignore i see the next message (general protection exception)
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DES implementation in C++ v1.0 (Data Encryption Standard)

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