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Delay Tolerant Network Security. -a literary survey. Venkata Krishna Sangeetha. In a bird’s view. Existing standard networks Probing reasons for a new network DTN in a few words Architecture explained Services Is it perfect ? Threat Model Why and what need for security?

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delay tolerant network security
Delay Tolerant Network Security

-a literary survey

Venkata Krishna Sangeetha

In a bird’s view
  • Existing standard networks
  • Probing reasons for a new network
  • DTN in a few words
  • Architecture explained
  • Services
  • Is it perfect?
  • Threat Model
  • Why and what need for security?
  • Bundle: The Big Daddy
  • Schemes tabulated
  • Ending the discussion
Internet Today
  • Successful at interconnecting communication devices across the globe
  • Based on TCP/IP protocol suite and wired links
  • Connected in end-to-end, low-delay paths between sources and destinations
  • Low error rates and relatively symmetric bidirectional data rates
Why a Delay Tolerant Network?

Intermittent Connectivity: TCP/IP protocols fail when network partitioning occurs.

Long or Variable Delays: Long delays between nodes and variable queuing delays contribute to end to end delays defeating internet protocols and applications.

Asymmetric Data Rates: Large asymmetries in data rates are not supported by the Internet.

High error Rates: The error rate increases with the end-end retransmission of packets.

dtn overview
DTN Overview
  • Overlay network
  • Connecting disconnected or heterogeneous networks (network of internets)
  • Store-and-Forward network
  • Typical resource-challenged networks
Open Issues in Delay Tolerant Networks
  • Key Management: Lack of a key distribution service in a high delay/ disrupted environment.
  • Handling Replays: A generic DTN replay detection scheme is hard to determine.
  • Traffic Analysis: Protection against traffic is debatable.
  • Routing protocol security: Inherent uncertainty in the network makes routing a problem.
  • Multicast/ Anycast security: Current architecture does not support such endpoints.
  • Performance Issues: Tradeoff between security and performance due to the added overhead.
dtn security requirements characteristics
DTN Security Requirements & Characteristics
  • Lack of end- to – end Connectivity: Traditional round key agreements do not work.
  • Fragmentation: Splitting of a message into fragments or “bundles”.
  • Resource scarcity: Contact time introduces limitations.
  • Bundle Accumulation: Store and forward approach may lead to bundle accumulation.
  • Authentication: Essential for every node to authenticate the data.
  • Confidentiality: Ensuring that the sensitive information is not revealed to unauthorized parties.
  • Integrity: To ensure that transmitted messages cannot be altered.
  • Privacy/Anonymity: User location should not be revealed.
bundle protocol security
Bundle Protocol Security
  • Data is sent in the form of bundles
  • Different types of blocks implemented to provide security services at various levels like hop-by-hop authentication, payload confidentiality and integrity in each bundle
  • Not all nodes have security capabilities
bundle security protocol specification
Bundle Security Protocol Specification
  • Bundle Authentication Block – ensure authenticity and integrity of bundle along a single security hop.
    • Uses HMAC
  • Payload Integrity Block – authenticity and integrity of the payload along the PIB security-source to PIB security-destination.
    • Uses RSA-SHA256
  • Payload Confidentiality Block – indicates payload is encrypted to protect the content.
  • Extension Security Block – provides security for non-payload blocks in a bundle
    • RSA-AES128-EXT
drawing conclusions
Drawing Conclusions
  • DTN is an overlay network connecting various types of networks
  • Security considerations for this type of challenging networks is difficult.
  • Security considerations for the below layers usually apply for this.
  • Current researching groups:

* The Internet Research Task Force’s Delay-Tolerant Networking Research Group (DTNRG)

* The InterPlaNetary (IPN) Internet Project,

* NASA Jet Propulsion Laboratory

* Google Laboratory

* Intel Research Corporation, etc.