#include <stdio.h>
#include <ctype.h>
void main() {
int user_input;
while((user_input=getchar())) {
if (islower(user_input))
user_input = 'a' + (user_input - 'a' + 18) % 26;
if (isupper(user_input))
user_input = 'A' + (user_input - 'A' + 18) % 26;
/* convert to string and put a reverse string function here */
putchar(user_input);
}
Keith Rice wrote:
> Alec Kosky wrote:
> >
> > On 01-Dec-99 Jon Mitchell wrote:
> > > However we discovered that
> > > it does not appear to be any sort of MD5 encryption scheme (although I'm
> > > not an encryption expert), but in actuality what we've deemed Secret
> > > Decoder Ring encryption. The letters are one to one with another letter,
> > > and even worse, in order as well.
> > >
> > > Here's an example of two sets of letters:
> > >
> > > You type: abcd
> > > Transmits: VUTS
> > >
> > > You type: ABCD
> > > Transmits: vuts
> >
> > ROT13 encoding - like the caesar cipher (it may be the caesar cipher?). Take
> > your character and rotate 13 characters.
> >
> > --Alec--
>
> It's vaguely similar to the ROT13 encoding scheme but it's not ROT13. If it
> were, then "abcd" would be transmitted as "nopq".
>
> It looks like it reverses the alphabet and then rotate the resulting alphabet
> until it starts with the character "v". It then maps the letters to its
> corresponding character and changes the case.
>
> I wonder how it handles numeric characters and punctuation...
>
> Later,
> Keith
>
> P.S. Don't forget to drink your Ovaltine!
--
William Randolph Royere III
Chief Science Officer, GNSS
PGP Fingerprint: 35FC 79E1 41DB 91FD 751C 2AB5 B4F0 E58F 8F2C 4584
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