diff --git a/resources/openpgp.js b/resources/openpgp.js
index 1c07c6ea..a3087e61 100644
--- a/resources/openpgp.js
+++ b/resources/openpgp.js
@@ -11605,7 +11605,7 @@ function openpgp_keyring() {
 var Util = function() {
 	
 	this.hexdump = function(str) {
-	    var r="";
+	    var r=[];
 	    var e=str.length;
 	    var c=0;
 	    var h;
@@ -11613,12 +11613,12 @@ var Util = function() {
 	    while(c<e){
 	        h=str.charCodeAt(c++).toString(16);
 	        while(h.length<2) h="0"+h;
-	        r+=" "+h;
+	        r.push(" "+h);
 	        i++;
 	        if (i % 32 == 0)
-	        	r+="\n           ";
+	        	r.push("\n           ");
 	    }
-	    return r;
+	    return r.join('');
 	};
 	/**
 	 * create hexstring from a binary
@@ -11628,16 +11628,16 @@ var Util = function() {
 	this.hexstrdump = function(str) {
 		if (str == null)
 			return "";
-	    var r="";
+	    var r=[];
 	    var e=str.length;
 	    var c=0;
 	    var h;
 	    while(c<e){
 	        h=str[c++].charCodeAt().toString(16);
 	        while(h.length<2) h="0"+h;
-	        r+=""+h;
+	        r.push(""+h);
 	    }
-	    return r;
+	    return r.join('');
 	};
 	/**
 	 * creating a hex string from an binary array of integers (0..255)
@@ -11645,16 +11645,16 @@ var Util = function() {
 	 * @return [String] hexadecimal representation of the array
 	 */
 	this.hexidump = function(str) {
-	    var r="";
+	    var r=[];
 	    var e=str.length;
 	    var c=0;
 	    var h;
 	    while(c<e){
 	        h=str[c++].toString(16);
 	        while(h.length<2) h="0"+h;
-	        r+=""+h;
+	        r.push(""+h);
 	    }
-	    return r;
+	    return r.join('');
 	};
 	
 	/**
@@ -11677,11 +11677,11 @@ var Util = function() {
 	 * @return [String] string representation of the array
 	 */
 	this.bin2str = function(bin) {
-		var result = "";
+		var result = [];
 		for (var i = 0; i < bin.length; i++) {
-			result += String.fromCharCode(bin[i]);
+			result.push(String.fromCharCode(bin[i]));
 		}
-		return result;
+		return result.join('');
 	};
 	
 	/**
diff --git a/resources/openpgp.min.js b/resources/openpgp.min.js
index 28f946b2..4ce23023 100644
--- a/resources/openpgp.min.js
+++ b/resources/openpgp.min.js
@@ -426,8 +426,8 @@ a.trim(),a=0;a<this.publicKeys.length;a++)for(c=0;c<this.publicKeys[a].obj.userI
 function(a){for(var b=[],c=0;c<this.publicKeys.length;c++)a==this.publicKeys[c].obj.getKeyId()&&(b[b.length]=this.publicKeys[c]);return b};this.getPrivateKeyForKeyId=function(a){for(var b=[],c=0;c<this.privateKeys.length;c++)if(a==util.hexstrdump(this.privateKeys[c].obj.getKeyId())&&(b[b.length]={key:this.privateKeys[c],keymaterial:this.privateKeys[c].obj.privateKeyPacket}),null!=this.privateKeys[c].obj.subKeys)for(var d=this.privateKeys[c].obj.getSubKeyIds(),e=0;e<d.length;e++)a==util.hexstrdump(d[e])&&
 (b[b.length]={key:this.privateKeys[c],keymaterial:this.privateKeys[c].obj.subKeys[e]});return b};this.importPublicKey=function(a){for(var b=openpgp.read_publicKey(a),c=0;c<b.length;c++)this.publicKeys[this.publicKeys.length]={armored:a,obj:b[c],keyId:b[c].getKeyId()}};this.importPrivateKey=function(a){for(var b=openpgp.read_privateKey(a),c=0;c<b.length;c++)this.privateKeys[this.privateKeys.length]={armored:a,obj:b[c],keyId:b[c].getKeyId()}};this.exportPublicKey=function(a){return this.publicKey[a]};
 this.removePublicKey=function(a){a=this.publicKeys.splice(a,1);this.store();return a};this.exportPrivateKey=function(a){return this.privateKeys[a]};this.removePrivateKey=function(a){a=this.privateKeys.splice(a,1);this.store();return a}}
-var Util=function(){this.hexdump=function(a){for(var b="",c=a.length,d=0,e,f=0;d<c;){for(e=a.charCodeAt(d++).toString(16);2>e.length;)e="0"+e;b+=" "+e;f++;0==f%32&&(b+="\n           ")}return b};this.hexstrdump=function(a){if(null==a)return"";for(var b="",c=a.length,d=0,e;d<c;){for(e=a[d++].charCodeAt().toString(16);2>e.length;)e="0"+e;b+=""+e}return b};this.hexidump=function(a){for(var b="",c=a.length,d=0,e;d<c;){for(e=a[d++].toString(16);2>e.length;)e="0"+e;b+=""+e}return b};this.str2bin=function(a){for(var b=
-[],c=0;c<a.length;c++)b[c]=a.charCodeAt(c);return b};this.bin2str=function(a){for(var b="",c=0;c<a.length;c++)b+=String.fromCharCode(a[c]);return b};this.calc_checksum=function(a){for(var b={s:0,add:function(a){this.s=(this.s+a)%65536}},c=0;c<a.length;c++)b.add(a.charCodeAt(c));return b.s};this.print_debug=function(a){openpgp.config.debug&&(a=openpgp_encoding_html_encode(a),showMessages('<tt><p style="background-color: #ffffff; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;">'+
+var Util=function(){this.hexdump=function(a){for(var b=[],c=a.length,d=0,e,f=0;d<c;){for(e=a.charCodeAt(d++).toString(16);2>e.length;)e="0"+e;b.push(" "+e);f++;0==f%32&&b.push("\n           ")}return b.join("")};this.hexstrdump=function(a){if(null==a)return"";for(var b=[],c=a.length,d=0,e;d<c;){for(e=a[d++].charCodeAt().toString(16);2>e.length;)e="0"+e;b.push(""+e)}return b.join("")};this.hexidump=function(a){for(var b=[],c=a.length,d=0,e;d<c;){for(e=a[d++].toString(16);2>e.length;)e="0"+e;b.push(""+
+e)}return b.join("")};this.str2bin=function(a){for(var b=[],c=0;c<a.length;c++)b[c]=a.charCodeAt(c);return b};this.bin2str=function(a){for(var b=[],c=0;c<a.length;c++)b.push(String.fromCharCode(a[c]));return b.join("")};this.calc_checksum=function(a){for(var b={s:0,add:function(a){this.s=(this.s+a)%65536}},c=0;c<a.length;c++)b.add(a.charCodeAt(c));return b.s};this.print_debug=function(a){openpgp.config.debug&&(a=openpgp_encoding_html_encode(a),showMessages('<tt><p style="background-color: #ffffff; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;">'+
 a.replace(/\n/g,"<br>")+"</p></tt>"))};this.print_debug_hexstr_dump=function(a,b){openpgp.config.debug&&(a+=this.hexstrdump(b),a=openpgp_encoding_html_encode(a),showMessages('<tt><p style="background-color: #ffffff; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;">'+a.replace(/\n/g,"<br>")+"</p></tt>"))};this.print_error=function(a){a=openpgp_encoding_html_encode(a);showMessages('<p style="font-size: 80%; background-color: #FF8888; margin:0; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;"><span style="color: #888;"><b>ERROR:</b></span>\t'+
 a.replace(/\n/g,"<br>")+"</p>")};this.print_info=function(a){a=openpgp_encoding_html_encode(a);showMessages('<p style="font-size: 80%; background-color: #88FF88; margin:0; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;"><span style="color: #888;"><b>INFO:</b></span>\t'+a.replace(/\n/g,"<br>")+"</p>")};this.print_warning=function(a){a=openpgp_encoding_html_encode(a);showMessages('<p style="font-size: 80%; background-color: #FFAA88; margin:0; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;"><span style="color: #888;"><b>WARNING:</b></span>\t'+
 a.replace(/\n/g,"<br>")+"</p>")};this.getLeftNBits=function(a,b){var c=b%8;return 0==c?a.substring(0,b/8):this.shiftRight(a.substring(0,(b-c)/8+1),8-c)};this.shiftRight=function(a,b){var c=util.str2bin(a);if(0!=b%8)for(var d=c.length-1;0<=d;d--)c[d]>>=b%8,0<d&&(c[d]|=c[d-1]<<8-b%8&255);else return a;return util.bin2str(c)};this.get_hashAlgorithmString=function(a){switch(a){case 1:return"MD5";case 2:return"SHA1";case 3:return"RIPEMD160";case 8:return"SHA256";case 9:return"SHA384";case 10:return"SHA512";
diff --git a/src/util/util.js b/src/util/util.js
index 5bcf0b86..6b5de78f 100644
--- a/src/util/util.js
+++ b/src/util/util.js
@@ -18,7 +18,7 @@
 var Util = function() {
 	
 	this.hexdump = function(str) {
-	    var r="";
+	    var r=[];
 	    var e=str.length;
 	    var c=0;
 	    var h;
@@ -26,12 +26,12 @@ var Util = function() {
 	    while(c<e){
 	        h=str.charCodeAt(c++).toString(16);
 	        while(h.length<2) h="0"+h;
-	        r+=" "+h;
+	        r.push(" "+h);
 	        i++;
 	        if (i % 32 == 0)
-	        	r+="\n           ";
+	        	r.push("\n           ");
 	    }
-	    return r;
+	    return r.join('');
 	};
 	/**
 	 * create hexstring from a binary
@@ -41,16 +41,16 @@ var Util = function() {
 	this.hexstrdump = function(str) {
 		if (str == null)
 			return "";
-	    var r="";
+	    var r=[];
 	    var e=str.length;
 	    var c=0;
 	    var h;
 	    while(c<e){
 	        h=str[c++].charCodeAt().toString(16);
 	        while(h.length<2) h="0"+h;
-	        r+=""+h;
+	        r.push(""+h);
 	    }
-	    return r;
+	    return r.join('');
 	};
 	/**
 	 * creating a hex string from an binary array of integers (0..255)
@@ -58,16 +58,16 @@ var Util = function() {
 	 * @return [String] hexadecimal representation of the array
 	 */
 	this.hexidump = function(str) {
-	    var r="";
+	    var r=[];
 	    var e=str.length;
 	    var c=0;
 	    var h;
 	    while(c<e){
 	        h=str[c++].toString(16);
 	        while(h.length<2) h="0"+h;
-	        r+=""+h;
+	        r.push(""+h);
 	    }
-	    return r;
+	    return r.join('');
 	};
 	
 	/**
@@ -90,11 +90,11 @@ var Util = function() {
 	 * @return [String] string representation of the array
 	 */
 	this.bin2str = function(bin) {
-		var result = "";
+		var result = [];
 		for (var i = 0; i < bin.length; i++) {
-			result += String.fromCharCode(bin[i]);
+			result.push(String.fromCharCode(bin[i]));
 		}
-		return result;
+		return result.join('');
 	};
 	
 	/**