diff --git a/js/SignedInfo.js b/js/SignedInfo.js
new file mode 100644
index 0000000..3d03f17
--- /dev/null
+++ b/js/SignedInfo.js
@@ -0,0 +1,121 @@
+/*
+ * @author: ucla-cs
+ * This class represents SignedInfo Object
+ * This keeps information about the ContentObject Signature
+ */
+
+var ContentType = {DATA:0, ENCR:1, GONE:2, KEY:3, LINK:4, NACK:5};
+
+var ContentTypeValue = {0:0x0C04C0, 1:0x10D091,2:0x18E344,3:0x28463F,4:0x2C834A,5:0x34008A};
+var ContentTypeValueReverse = {0x0C04C0:0, 0x10D091:1,0x18E344:2,0x28463F:3,0x2C834A:4,0x34008A:5};
+
+
+var SignedInfo = function SignedInfo(_publisher,_timestamp,_type,_locator,_freshnessSeconds,_finalBlockID){
+
+	//TODO, Check types
+    
+    this.Publisher = _publisher; //PublisherPublicKeyDigest
+    this.Timestamp=_timestamp; // CCN Time
+    this.Type=_type; // ContentType
+    this.Locator =_locator;//KeyLocator
+    this.FreshnessSeconds =_freshnessSeconds; // Integer
+    this.FinalBlockID=_finalBlockID; //byte array
+
+};
+
+
+SignedInfo.prototype.decode = function( decoder){
+
+		decoder.readStartElement( this.getElementLabel() );
+		
+		if (decoder.peekStartElement(CCNProtocolDTags.PublisherPublicKeyDigest)) {
+			this.Publisher = new PublisherPublicKeyDigest();
+			this.Publisher.decode(decoder);
+		}
+
+		if (decoder.peekStartElement(CCNProtocolDTags.Timestamp)) {
+			this.Timestamp = decoder.readDateTime(CCNProtocolDTags.Timestamp);
+		}
+
+		if (decoder.peekStartElement(CCNProtocolDTags.Type)) {
+			binType = decoder.readBinaryElement(CCNProtocolDTags.Type);//byte [] 
+		
+		
+			//TODO Implement Type of Key Reading
+			
+			//this.Type = valueToType(binType);
+			
+			
+			//TODO Implement Type of Key Reading
+			
+			/*
+			if (null == this.Type) {
+				throw new Exception("Cannot parse signedInfo type: bytes.");
+			}
+			
+		} else {
+			this.Type = ContentType.DATA; // default*/
+		}
+		
+		if (decoder.peekStartElement(CCNProtocolDTags.FreshnessSeconds)) {
+			this.FreshnessSeconds = decoder.readIntegerElement(CCNProtocolDTags.FreshnessSeconds);
+		}
+		
+		if (decoder.peekStartElement(CCNProtocolDTags.FinalBlockID)) {
+			this.FinalBlockID = decoder.readBinaryElement(CCNProtocolDTags.FinalBlockID);
+		}
+		
+		if (decoder.peekStartElement(CCNProtocolDTags.KeyLocator)) {
+			this.Locator = new KeyLocator();
+			this.Locator.decode(decoder);
+		}
+				
+		decoder.readEndElement();
+};
+
+SignedInfo.prototype.encode = function( encoder)  {
+		if (!this.validate()) {
+			throw new Exception("Cannot encode : field values missing.");
+		}
+		encoder.writeStartElement(this.getElementLabel());
+		
+		if (null!=this.Publisher) {
+			this.Publisher.encode(encoder);
+		}
+
+		if (null!=this.Timestamp) {
+			encoder.writeDateTime(CCNProtocolDTags.Timestamp, this.Timestamp);
+		}
+		
+		if (null!=this.Type && this.Type !=0) {
+			
+			encoder.writeElement(CCNProtocolDTags.Type, this.Type);
+		}
+		
+		if (null!=this.FreshnessSeconds) {
+			encoder.writeElement(CCNProtocolDTags.FreshnessSeconds, this.FreshnessSeconds);
+		}
+
+		if (null!=this.FinalBlockID) {
+			encoder.writeElement(CCNProtocolDTags.FinalBlockID, this.FinalBlockID);
+		}
+
+		if (null!=this.Locator) {
+			this.Locator.encode(encoder);
+		}
+
+		encoder.writeEndElement();   		
+};
+	
+SignedInfo.prototype.getElementLabel = function() { 
+	return CCNProtocolDTags.SignedInfo;
+};
+
+SignedInfo.prototype.validate = function() {
+		// We don't do partial matches any more, even though encoder/decoder
+		// is still pretty generous.
+		if (null ==this.Publisher || null==this.Timestamp ||null== this.Locator)
+			return false;
+		return true;
+};
+