[Webinar] Streamline your web hosting managementRegister Today

x
?
Solved

decoder encoder

Posted on 1998-02-12
9
Medium Priority
?
371 Views
Last Modified: 2012-05-04
encoder decorer in C language
0
Comment
Question by:latino
  • 3
  • 2
  • 2
  • +2
9 Comments
 
LVL 3

Expert Comment

by:q2guo
ID: 1257223
What's you question?
0
 
LVL 1

Expert Comment

by:jasonf
ID: 1257224
Do you mean you want to emulate a TTL 2 to 4 line decoder/encoder, for example, in software?  If so, how many lines (eg. 2 to 4, 3 to 8, etc.) and do you want to have an enable signal (like a TTL part)?
0
 
LVL 2

Accepted Solution

by:
Ready4Dis earned 150 total points
ID: 1257225
Here is an encrypter/decrypter...
#include <conio.h>
#include <stdio.h>
#include <string.h>

main (int arg, char *argv[])
{
      int does,add,times;
      char temp,key,*did;
      FILE *in,*out;
      if (arg<4) {
            printf("Use: Crypt -E/-D Infile Outfile\n");
            printf("-E   Encrypt/-D   Decrypt");
            return -1;
      }
      if (!strcmpi(argv[1],"-E")) does=1;
      if (!strcmpi(argv[1],"-D")) does=2;
      printf("What is the four key password: ");
      times=0;
      while (times<2) {
            key=getche();
            times++;
            add+=key;
      }
      times=0;
      while (times<2) {
            key=getche();
            times++;
            add-=key;
      }
      if (does==2) add=-add;
      times=0;
      clrscr();
      in=fopen(argv[2],"rb");
      out=fopen(argv[3],"wb");
      if (does==2) printf("File: ");
      while (!feof(in)){
            temp=fgetc(in);
            times++;
            if (feof(in)) {
            if (does==2) did="Decrypting";
            else did="Encrypting";
            printf("\n");
            printf("Done %s %s\n",did,argv[2]);
            printf("Size: %d -Bytes",times-1);
            return 0;
            }
            temp+=add;
            fputc(temp,out);
            if (does==2) printf("%c",temp);
      }
      return 0;
}
0
IT Degree with Certifications Included

Aspire to become a network administrator, network security analyst, or computer and information systems manager? Make the most of your experience as an IT professional by earning your B.S. in Network Operations and Security.

 

Author Comment

by:latino
ID: 1257226
Still evaluating your answer ready thanks
0
 
LVL 85

Expert Comment

by:ozo
ID: 1257227
You should know that it's pretty easy to crack that encryption.
0
 
LVL 2

Expert Comment

by:Ready4Dis
ID: 1257228
Yes, it's easy, but it is just s simple example for him to learn from, not the source to a government agency's encryption program.
0
 
LVL 2

Expert Comment

by:Ready4Dis
ID: 1257229
Yes, it's easy, but it is just s simple example for him to learn from, not the source to a government agency's encryption program.
0
 
LVL 85

Expert Comment

by:ozo
ID: 1257230
Nothing wrong with that, as long as you understand it.
0
 

Author Comment

by:latino
ID: 1257231
thks all!!
0

Featured Post

Choose an Exciting Career in Cybersecurity

Help prevent cyber-threats and provide solutions to safeguard our global digital economy. Earn your MS in Cybersecurity. WGU’s MSCSIA degree program was designed in collaboration with national intelligence organizations and IT industry leaders.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Preface I don't like visual development tools that are supposed to write a program for me. Even if it is Xcode and I can use Interface Builder. Yes, it is a perfect tool and has helped me a lot, mainly, in the beginning, when my programs were small…
Examines three attack vectors, specifically, the different types of malware used in malicious attacks, web application attacks, and finally, network based attacks.  Concludes by examining the means of securing and protecting critical systems and inf…
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand and use nested-loops in the C programming language.
The goal of this video is to provide viewers with basic examples to understand and use conditional statements in the C programming language.
Suggested Courses

590 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question