Email Obfuscator

Easy-to-use substitution cipher encrypting via ROT13 email addresses to avoid them getting harvested by spam-bots while keeping the mailto: feature. It rests on JavaScript and includes a pure CSS fallback. See file "obfuscator.html" for more details.

ROT13 function (JavaScript)

String.prototype.rotate  = function() { 
            return this.replace(/[a-zA-Z]/ig, function(chr) {
            var cc = chr.charCodeAt(0);
            if (cc >= 65 && cc <= 90) cc = 65 + ((cc - 52) % 26);
            else if (cc >= 97 && cc <= 122) cc = 97 + ((cc - 84) % 26);
            else if (cc >= 48 && cc <= 57) cc = 48 + ((cc - 43) % 10);
            return String.fromCharCode(cc);
                			});
		};

Reverse strings (CSS fallback)

String.prototype.reverse = function() {

    return this.split( '' ).reverse().join( '' ); 
      
      };

Display & De-cipher the mailto

<span id="obf">
<script>
document.getElementById("obf").innerHTML="<n uers=\\"znvygb:' + email + subject +'\\">' + anchor + '</n>\".replace(/[a-z0-9]/g,function(c){return String.fromCharCode((c<="Z"?90:122)>=(c=c.charCodeAt(0)+13)?c:c-26);});
</script>

where variables "email", "subject" and "anchor" have been retrieved from input fields and rotated thanks to the rotate() function.

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Copyright (c) 2012 Florian Bersier | MIT Licensed