#include <stdio.h> #define LENGTH 3 int main( void ){ char crypt[ LENGTH ], c; int index = 0; while( (c = getchar()) != EOF ){ crypt[ index ] = c; index++; if( index >= LENGTH ){ while( index > 0 ){ index--; putchar( crypt[ index ] ); } } } while( index > 0 ){ index--; putchar( crypt[ index ] ); } return 0; } /* turing$ make gcc -Wall crypta.c -o crypta turing$ echo "Geheimer Text :-)" | crypta heGmie rexeT: t )-turing$ turing$ echo "Geheimer Text :-)" | crypta | crypta Geheimer Text :-) */
#include <stdio.h> #define KEY 0x1f int main( void ){ char c; while( (c = getchar()) != EOF ){ putchar( c ^ KEY ); } return 0; } /* turing$ make cryptb gcc -Wall cryptb.c -o cryptb turing$ echo "Geheimer Text :-)" | cryptb Xzwzvrzm?Kzgk?%26turing$ turing$ echo "Geheimer Text :-)" | cryptb | cryptb Geheimer Text :-) turing$ */