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EFFICACY OF THE NRL NETWORK PUMP IN MITIGATING COVERT TIMING CHANNELS

Platform : DOT NET

IEEE Projects Years : 2012 - 13

EFFICACY OF THE NRL NETWORK PUMP IN MITIGATING

COVERT TIMING CHANNELS

ABSTRACT:

 The Naval Research Laboratory (NRL) Network Pump, or Pump, is a standard for mitigating covert channels that arise in a multilevel secure (MLS) system when a high user (HU) sends acknowledgements to a low user (LU). The issue here is that HU can encode information in the timings” of the acknowledgements. The Pump aims at mitigating the covert timing channel by introducing buffering between HU and LU, as well as adding noise to the acknowledgment timings.

EXISTING SYSTEM:

The detection of covert timing channels is of increasing interest in light of recent practice on the exploitation of covert timing channels over the Internet. However, due to the high variation in legitimate network traffic, detecting covert timing channels is a challenging task. The existing detection schemes are ineffective to detect most of the covert timing channels known to the security community.

PROPOSED SYSTEM:

We model the working of the Pump in certain situations, as a communication system with feedback and use then this perspective to derive an upper bound on the capacity of the covert channel between HU and LU in the Pump. This upper bound is presented in terms of a directed information flow over the dynamics of the system. We also present an achievable scheme that can transmit information over this channel. When the support of the noise added by Pump to acknowledgment timings is finite, the achievable rate is nonzero, i.e., infinite number of bits can be reliably communicated. If the support of the noise is infinite, the achievable rate is zero and hence a finite number of bits can be communicated.

 

 

 

 

 

 

HARDWARE REQUIREMENTS:

 

  • System                                    :           Pentium IV 2.4 GHz.
  • Hard Disk                   :           40 GB.
  • Monitor                       :           15 VGA Colour.
  • Mouse                         :           Logitech.
  • Ram                             :           256 Mb.

 

SOFTWARE REQUIREMENTS:

 

  • Operating system        : -         Windows XP Professional.
  • Front End                    : -         Visual Studio 2008.
  • Coding Language       : -         Visual C# .Net.

MODULES:

  1. COMMUNICATION CHANNELS
  2. PUMP (BUFFER) METHOD.
  3. COVERT TIMING CHANNEL
  4. ANALYZED THE CAPACITY

MODULE DESCRIPTION:

COMMUNICATION CHANNELS MODULES:

Shared between processes can lead to covert and side channels that can leak information from one process to another. Communication channels between two processes that collude are called covert channels; one process structures its use of the shared resource in a particular way in order to communicate secret information to another. Covert channels have been studied extensively in the context of MLS systems, where they can be used to create forbidden information flows. In a side channel, on the other hand, one 1process tries to learn something about the operation of another without the latter’s cooperation. Timing channels, channels where information is conveyed by the timings of messages, are one particular class of covert and side channels. They have been studied in the literature in variety of contexts.

 

 

PUMP (BUFFER) METHOD:

The buffer inside the pump is composed of two parts. There is a buffer of size, and a buffer of size one. Each time LU intends to send a packet to HU, it inserts a packet into the buffer in the Pump. If the buffer is not full, then the packet is transferred from buffer to buffer, and an acknowledgement (ACK-L) is sent to LU. When the buffer is full, the packet is retained in buffer, and no acknowledgement is sent to LU.

The packet is transferred from to when some space clears up. Whenever the buffer is nonempty, the Pump forwards a packet from the buffer to HU. If HU accepts the packet, i.e., if the packet is transmitted to HU without any error, an acknowledgement (ACK-H) is sent from HU to the Pump. After receiving ACK-H, the Pump deletes the packet from the buffer.

 

COVERT TIMING CHANNEL MODULE:

 

The actions of HU and the actions of LU are isolated by the Pump. However, there is one scenario in which the Pump fails to provide this isolation. This is the case when the buffer in the Pump is full. Note two things: First, the full buffer channel was studied, but that was done without feedback being taken into consideration so those results may be interpreted as being overly optimistic; hence the need for this paper. Second, the operation of the Pump in its usual mode of not having a full buffer still may leak information from HU to LU. This covert leakage has been estimated in prior   Pump work, and is not the subject of this paper. Here we are    only concerned with the covert channel that arises due to a full buffer.

 

ANALYZED THE CAPACITY MODULE:

 

Analyzed the capacity of the covert channel present When a Pump is used to isolate communication between two users (HU and LU) with different clearance levels, and the Pump buffer becomes full. Following a careful modeling of its working, we show that it is possible to communicate over this channel. The HU–LU communication is interpreted as communication over a channel with noisy feedback, and we provide theoretical bounds on the rate of communication.



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