I'm trying to write a program that keeps data on people. The data is to be stored on the hard disk for future reference. The only way i know how to do this is to a txt file and this is not particularly secure. I fanyone knows of a better way could they please let me know what it is and how to do it
Joe
You could use some sort of encryption algorithm to make the data unreadable. There are plenty around, so do a google search
Well, it all depends on how hard you want to make it for crackers. Anywhere from the simple base64 or ROT13 to XOR up to PGP are options galore.
...this isn't for some malware thing, is it?
Code:#include <stdio.h> void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){ puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9 /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i] ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][ t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}
Operating Systems:
- Ubuntu 9.04
- XP
Compiler: gcc
why not just store it as a binary file?
If you don't expect your users to be too advanced, there's always the Registry.
Code:#include <stdio.h> void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){ puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9 /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i] ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][ t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}
