diff --git a/lib/browser/ECIES.js b/lib/browser/ECIES.js
index 681601e..ca89fa3 100644
--- a/lib/browser/ECIES.js
+++ b/lib/browser/ECIES.js
@@ -9,18 +9,10 @@ ECIES.symmetricEncrypt = function(key, iv, message) {
   var smessage = sjcl.codec.hex.toBits(message.toString('hex'));
 
   sjcl.beware["CBC mode is dangerous because it doesn't protect message integrity."]();
-  var params = {
-    iv: siv,
-    ks: 256,
-    ts: 128,
-    iter: 1000,
-    mode: 'cbc'
-  };
-  var encrypted = sjcl.encrypt(skey, smessage, params);
-  var enchex = sjcl.codec.hex.fromBits(sjcl.codec.base64.toBits(JSON.parse(encrypted).ct));
-
-  var encbuf = new Buffer(enchex, 'hex');
 
+  var cipher = new sjcl.cipher.aes(skey);
+  var encrypted = sjcl.mode.cbc.encrypt(cipher, smessage, siv);
+  var encbuf = new Buffer(sjcl.codec.hex.fromBits(encrypted), 'hex');
   var r = Buffer.concat([iv, encbuf]);
 
   return r;
@@ -31,25 +23,13 @@ ECIES.symmetricDecrypt = function(key, encrypted) {
   var iv = encrypted.slice(0, 16);
   var todecrypt = encrypted.slice(16, encrypted.length);
 
-  var siv = sjcl.codec.base64.fromBits(sjcl.codec.hex.toBits(iv.toString('hex')));
-  var sct = sjcl.codec.base64.fromBits(sjcl.codec.hex.toBits(todecrypt.toString('hex')));
-
   sjcl.beware["CBC mode is dangerous because it doesn't protect message integrity."]();
-  var obj = {
-    iv: siv,
-    v: 1,
-    iter: 1000,
-    ks: 256,
-    ts: 128,
-    mode: 'cbc',
-    adata: '',
-    cipher: 'aes',
-    ct: sct
-  };
-  var str = JSON.stringify(obj);
 
-  var decrypted = sjcl.decrypt(skey, str);
-  var decbuf = new Buffer(decrypted);
+  var encbits = sjcl.codec.hex.toBits(todecrypt.toString('hex'));
+  var ivbits = sjcl.codec.hex.toBits(iv.toString('hex'));
+  var cipher = new sjcl.cipher.aes(skey);
+  var decrypted = sjcl.mode.cbc.decrypt(cipher, encbits, ivbits);
+  var decbuf = new Buffer(sjcl.codec.hex.fromBits(decrypted), 'hex');
 
   return decbuf;
 };
diff --git a/test/test.ECIES.js b/test/test.ECIES.js
index 88138e1..22a1727 100644
--- a/test/test.ECIES.js
+++ b/test/test.ECIES.js
@@ -75,6 +75,62 @@ describe('ECIES', function() {
       decrypted.toString().should.equal('this is my message');
     });
 
+    it('should encrypt and decrypt 0x80 correctly, the first bad byte', function() {
+      var privhex = 'e0224327f5e4a9daea6c7b996cb013775f90821d15d7d0d25db517c7cd0c1a8e';
+      var key = new bitcore.Key();
+      key.private = new Buffer(privhex, 'hex');
+      key.regenerateSync();
+
+      var data = new Buffer([0x80]);
+      var encrypted = bitcore.ECIES.encrypt(key.public, data);
+      var decrypted = bitcore.ECIES.decrypt(key.private, encrypted);
+      decrypted.toString('hex').should.equal('80');
+      decrypted.toString('hex').should.not.equal('c280');
+    });
+
+    it('should encrypt and decrypt this known problematic encrypted message', function() {
+      var privhex = 'e0224327f5e4a9daea6c7b996cb013775f90821d15d7d0d25db517c7cd0c1a8e';
+      var key = new bitcore.Key();
+      key.private = new Buffer(privhex, 'hex');
+      key.regenerateSync();
+
+      var data = new Buffer('010053bdae9b000000017b2274797065223a2268656c6c6f222c22636f70617965724964223a22303237323735366234366561386564313763376166613934303861306161333535616266326432623263353134373637343766353135326332623535653163656230227d', 'hex');
+      var data = new Buffer('53bdae00', 'hex');
+
+      var encrypted = bitcore.ECIES.encrypt(key.public, data);
+      var decrypted = bitcore.ECIES.decrypt(key.private, encrypted);
+      decrypted.toString('hex').should.not.equal('53c2bdc2ae00');
+      decrypted.toString('hex').should.equal('53bdae00');
+
+    });
+
+    it('should encrypt and decrypt this known problematic encrypted message', function() {
+      var privhex = 'e0224327f5e4a9daea6c7b996cb013775f90821d15d7d0d25db517c7cd0c1a8e';
+      var key = new bitcore.Key();
+      key.private = new Buffer(privhex, 'hex');
+      key.regenerateSync();
+
+      var data = new Buffer('010053bdae9b000000017b2274797065223a2268656c6c6f222c22636f70617965724964223a22303237323735366234366561386564313763376166613934303861306161333535616266326432623263353134373637343766353135326332623535653163656230227d', 'hex');
+      var encrypted = bitcore.ECIES.encrypt(key.public, data);
+      var decrypted = bitcore.ECIES.decrypt(key.private, encrypted);
+      decrypted.toString('hex').should.equal('010053bdae9b000000017b2274797065223a2268656c6c6f222c22636f70617965724964223a22303237323735366234366561386564313763376166613934303861306161333535616266326432623263353134373637343766353135326332623535653163656230227d');
+
+    });
+
+    it('should decrypt this known problematic encrypted message', function() {
+      var privhex = 'e0224327f5e4a9daea6c7b996cb013775f90821d15d7d0d25db517c7cd0c1a8e';
+      var key = new bitcore.Key();
+      key.private = new Buffer(privhex, 'hex');
+      key.regenerateSync();
+
+      var encryptedhex = '02f773c550bf228327f773b1dc63802055ba7333ee4ea86323e1a77365f14fede041dbe628dc636c5eebb572578e79184a96eee82db57b456328ca080a9e8b0b856474119f65b942b088ce09dcfb8536632d57343d533e9b55c8f17cc52466a6dfada1848923782e99e8f2210cfd6a04510ea0a482f38e43a88b018b6e9cc27511df873f7aea04fd342a42f651481f42f91a7a672ef9d56080d072417ca6cb1a2771b6838f08ab49470d84fa67f85886382b503ab86fefd02195e49c0f8516884a3adc62bf176c5ff1665bafe1c9af59f6857531e86c2a650bebdbc60970f6b1ce';
+      var encrypted = new Buffer(encryptedhex, 'hex');
+
+      var decrypted = bitcore.ECIES.decrypt(key.private, encrypted);
+      decrypted.slice(10).toString().should.equal('{"type":"hello","copayerId":"024c0ec590ba86bbaf7beb9823c6610d02eacb9c3345bc678c09cc266590681af0"}');
+
+    });
+
     it('should not fail for long messages', function() {
       var key = new bitcore.Key();
       key.private = bitcore.util.sha256('test');