diff --git a/index.html b/index.html
index 95bbea9..b408b15 100644
--- a/index.html
+++ b/index.html
@@ -874,6 +874,10 @@
 									</span>
 								</div>
 							</div>
+							<div class="col-md-12">
+								<label for="signPrivateKeyPassphrase">Passphrase (optional)</label>
+								<input id="signPrivateKeyPassphrase" type="password" class="form-control" value="">
+							</div>
 						</div>
 						<br>
 
diff --git a/js/coinbin.js b/js/coinbin.js
index c6a1bbc..6365166 100644
--- a/js/coinbin.js
+++ b/js/coinbin.js
@@ -1196,7 +1196,18 @@ $(document).ready(function() {
 
 	$("#signBtn").click(function(){
 		var wifkey = $("#signPrivateKey");
+		var passphrase = $("#signPrivateKeyPassphrase");
 		var script = $("#signTransaction");
+		
+		if(passphrase.val()!=""){
+			var decrypted = CryptoJS.AES.decrypt(wifkey.val(), passphrase.val()).toString(CryptoJS.enc.Utf8);
+			if(coinjs.addressDecode(decrypted)){
+				$(passphrase).parent().removeClass('has-error');
+				wifkey.val(decrypted);
+			} else {
+				$(passphrase).parent().addClass('has-error');
+			}
+		}
 
 		if(coinjs.addressDecode(wifkey.val())){
 			$(wifkey).parent().removeClass('has-error');