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Hey, this is just something I coded a while back and wanted to show you guys.
Here is the code:
/*
* Text cypher by jackrtk
* usage: something.exe your text goes here!
* example output: 979b99a15ba9a0a75f97a7979aa39e9e67a5b1
*
* also, heres a challenge: decypher the example output
*/
#include <stdio.h>
void main(int argc, char *argv[])
{
int i,
k,
j;
printf("Encrypted Text: ");
for(k = 1; k != argc; k++)
{
for(i = 0; argv[k][i] != 0; i++)
{
j = ((argv[k][i]+i)+43); // algorithm: ((position in array + hex(chr))+43)
printf("%x",j);
}
}
}
BreakDown
Let's focus on 'cypher' code:
argv[k] = the 'k'th argument passed to the program, for example, if you executed:
cypher.exe hello im jack
argv[1] = hello
argv[2] = im
You get the picture...
So, argv[k]
; we know that k is the argument number, so 'i' is the char of that argument, example:
cypher.exe hello im jackr
argv[1][3] = "l"
argv[3][1] = "j"
Once we have this character, we apply our algorithm to it. My algorithm is
hex(((argv[k]+i)+43));
When we execute: cypher.exe lol hi
the program executes (to find "l"):
hex(((argv[1][1]+i)+43))
= hex(108+1+43)
= hex(152)
= 98
This procedure is repeated until no characters are left.
kbai; jackrtk.