Vigenère cipher: Difference between revisions

Content added Content deleted

Inline

@@ Line 947: / Line 947: @@
 dec: BEWARETHEJABBERWOCKTHEJAWSTHATTHECLAWSTHATCATCH</pre>
-====Variant====
+====Alternate version====
 No string to circular list conversion.
@@ Line 957: / Line 957: @@
   (string-upcase (remove-if-not 'alpha-char-p s)))
-(defun vigenere (text key &key decode &aux (d (if decode -1 1)))
+(defun vigenere (txt key &key decode &aux (d (if decode -1 1)))
-  (let ((text (strip text)) (key (strip key)) (i -1))
+  (let ((txt (strip txt)) (key (strip key)) (i -1))
     (map 'string
       (lambda (c)
         (setf i (mod (1+ i) (length key)))
         (char +a+ (mod (+ (position c +a+) (* d (position (elt key i) +a+))) 26)))
-      text)))</lang>
+      txt)))</lang>
 . Execution