diff --git a/libp2p/RLPXFrameWriter.cpp b/libp2p/RLPXFrameWriter.cpp
index c8c1e8ceb..a657afd70 100644
--- a/libp2p/RLPXFrameWriter.cpp
+++ b/libp2p/RLPXFrameWriter.cpp
@@ -25,6 +25,18 @@ using namespace std;
 using namespace dev;
 using namespace dev::p2p;
 
+RLPXFrameInfo::RLPXFrameInfo(bytesConstRef _header)
+{
+	length = (_header[0] * 256 + _header[1]) * 256 + _header[2];
+	padding = ((16 - (length % 16)) % 16);
+	RLP header(_header.cropped(3), RLP::ThrowOnFail | RLP::FailIfTooSmall);
+	auto itemCount = header.itemCount();
+	protocolId = header[0].toInt<uint16_t>();
+	hasSequence = itemCount > 1;
+	sequenceId = hasSequence ? header[1].toInt<uint16_t>() : 0;
+	totalLength = itemCount == 3 ? header[2].toInt<uint32_t>() : 0;
+}
+
 void RLPXFrameWriter::enque(unsigned _packetType, RLPStream& _payload, PacketPriority _priority)
 {
 	QueueState& qs = _priority ? m_q.first : m_q.second;
diff --git a/libp2p/RLPXFrameWriter.h b/libp2p/RLPXFrameWriter.h
index 957bb09a2..384bf0503 100644
--- a/libp2p/RLPXFrameWriter.h
+++ b/libp2p/RLPXFrameWriter.h
@@ -33,6 +33,22 @@ namespace dev
 namespace p2p
 {
 
+struct RLPXFrameDecrytFailed: virtual dev::Exception {};
+
+struct RLPXFrameInfo
+{
+	RLPXFrameInfo() = default;
+	/// Constructor. frame-size || protocol-type, [sequence-id[, total-packet-size]]
+	RLPXFrameInfo(bytesConstRef _frameHeader);
+	uint32_t length = 0;			///< Max: 2**24
+	uint8_t padding = 0;
+	
+	uint16_t protocolId = 0;
+	bool hasSequence = false;
+	uint16_t sequenceId = 0;
+	uint32_t totalLength = 0;
+};
+	
 /**
  * RLPFrameReader
  * Reads and assembles RLPX frame byte buffers into RLPX packets. Additionally
@@ -43,11 +59,15 @@ namespace p2p
  */
 class RLPXFrameReader
 {
+public:
 	RLPXFrameReader(uint16_t _protocolType): m_protocolType(_protocolType) {}
 	
 	/// Processes a single frame returning complete packets.
-	std::vector<RLPXPacket> demux(bytes& _frame, bool _sequence = false, uint16_t _seq = 0, uint32_t _totalSize = 0)
+	std::vector<RLPXPacket> demux(RLPXFrameCoder& _coder, bytes& _frame, bool _sequence = false, uint16_t _seq = 0, uint32_t _totalSize = 0)
 	{
+		if (!_coder.authAndDecryptFrame(&_frame))
+			BOOST_THROW_EXCEPTION(RLPXFrameDecrytFailed());
+		
 		std::vector<RLPXPacket> ret;
 		if (!_frame.size() || _frame.size() > _totalSize)
 			return ret;
@@ -100,6 +120,11 @@ protected:
 	std::map<uint16_t, std::pair<RLPXPacket, uint32_t>> m_incomplete;	///< Incomplete packets and bytes remaining.
 };
 
+/**
+ * RLPXFrameWriter
+ * Multiplex and encrypted packets into RLPX frames.
+ * @todo flag to disable multiple packets per frame
+ */
 class RLPXFrameWriter
 {
 	struct QueueState