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I came to the same conclusion just before I saw your post... and what wonder: Now the decryption works as well. :D I was thinking too strictly in terms of the already existing functions so I didn't notice the algebraic error, silly me. Well, the nice thing is that I now have a fully functional progr...

:shock: You guys are unbelievable! Thanks a lot! And yes, it really seems not this hard in retrospect, but that is nearly always the case. ;) Now I only have to find out how to make the matching decryption and I'm done for good. Unfortunately something along the following lines doesn't work since it...

Hm, I don't seem to get it right... what I managed until now is a function that actually encrypts a character with a key character. I need to find a possibility to use that function on two strings instead of two characters. The functions so far look like this: ; 1) Program that takes in a word(given...

Ah, I didn't realize that the uppercase letter was the problem, I thought the white space caused the error. Now I got the problem fixed by simply changing my *alphabet* to: (defparameter *alphabet* " aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ,.0123456789") Which gives me the foll...

It works! At least on single words. But non the less, thank you! I really didn't think I'd ever come this far, you helped me a lot and gave me the right hints. My program looks now like this: ; 1) Program that takes in a word(given as a string) plus a number and encrypts the word using Caesar's Ciph...

First off, thanks to all of you! By now I got far enough to encrypt a single character. I try now to get it working on a string but to no avail so far. The code I have until now looks like this: ; Alphabet as parameter plus one whitespace at index 0 (defparameter *alphabet* " abcdefghijklmnopqr...

Thanks for your posts! @Ramarren Well, I guess my university course is not the best since I wasn't told about sequences and my teachers use "LISP" as if it is the correct form... thanks for the enlightenment! I'll try my luck with these, maybe I get some results. :) @sinnatag My problem wi...

Hello all, I am a big LISP-Newb and am struggling with a program that is supposed to encrypt a string with Caesar's cipher. What I have in mind is a function that takes in 2 arguments: a string and a number to specify the modulus. Something along the lines: (defun c-encrypt (string number) ("lo...