A framework for secure and efficient data acquisition
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This document presents a framework called REACT for secure and efficient data acquisition in vehicular ad hoc networks (VANETs). REACT uses roadside units (RSUs) that vehicles can connect to in order to register, authenticate, and securely transmit sensitive data. The document describes the architecture of REACT, which includes how vehicles register with RSUs, how passwords are derived hierarchically for authentication, and the packet format used for communication. It analyzes the encryption delays associated with REACT and discusses the tradeoff between improving network performance through increased RSU deployment and the associated increased costs. The document concludes that an RSU scheduling mechanism is being designed to distribute load among time slots to improve efficiency.
![ANALYSIS:
 TAES−Enc =(46NbNr − 30Nb)Ta
 + [31NbNr + 12(Nr − 1) − 20Nb] To
 + [64NbNr + 96(Nr − 1) − 61Nb] Ts (1)
 where TAES−Enc is the number of processing cycles
required to encrypt one block of data, Nb is the block
size, and Nr is the number of iterations (which is equal
to 10 when the key size is 128 b). Assuming that each
basic operation requires one processing cycle, i.e., Ta =
To = Ts = 1, [41] derives the
ï‚— number of processing cycles to encrypt one block of
data as TAES−Enc = 6168 processing cycles.](https://image.slidesharecdn.com/aframeworkforsecureandefficientdataacquisition-130318112957-phpapp01/85/A-framework-for-secure-and-efficient-data-acquisition-10-320.jpg)
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A framework for secure and efficient data acquisition
- 1. A Framework for Secure and Efficient Data Acquisition in Vehicular Ad Hoc Networks BY LAVANYA BANDLA B.T.I
- 2. What are Vanets? ï‚— A Vehicular Ad-Hoc Network, or VANET is a technology that uses moving cars as nodes in a network to create a mobile network. ï‚— VANET turns every participating car approximately 100 to 300 meters to connect and in turn create a network with a wide range. ï‚— vehicles communicate with each other using the roadside units (RSUs).
- 3. APPLICATIONS: ï‚— GPS and navigation systems can benefit, as they can be integrated with traffic reports to provide the fastest route to work. ï‚— It would also allow for free services such as Google Talk or Skype between employees, lowering telecommunications costs. ï‚— Future applications could involve cruise control making automatic adjustments to maintain safe distances between vehicles or alerting the driver of emergency vehicles in the area.
- 4. ARCHITECTURE OF A REACT
- 5. REGISTRATION USING REACT ï‚— When users register using the RSU website, they specify their personal details (i.e., name, address, and phone) plus a username and password to use for authentication when they connect to the RSU network from their vehicle. ï‚— Users also choose a default RSU, which will save their account in its database
- 7. Packet format for READY ï‚— sensitive data can be encrypted using a 128- or 256-b symmetric key, whereas less sensitive data could be encrypted using an 80- or a 128-b key.
- 8. Interface between user and RSU
- 9. ANALYSIS: ï‚— Mathematical expressions were derived for the encryption and the decryption delays of AES. These are expressed as a function of the key size, the block size, and the number of processing cycles required for performing basic operations that are used in AES such as bytewise AND (Ta), bytewise OR (To), and bytewise shift (Ts). The resulting expression is:
- 10. ANALYSIS:  TAES−Enc =(46NbNr − 30Nb)Ta  + [31NbNr + 12(Nr − 1) − 20Nb] To  + [64NbNr + 96(Nr − 1) − 61Nb] Ts (1)  where TAES−Enc is the number of processing cycles required to encrypt one block of data, Nb is the block size, and Nr is the number of iterations (which is equal to 10 when the key size is 128 b). Assuming that each basic operation requires one processing cycle, i.e., Ta = To = Ts = 1, [41] derives the  number of processing cycles to encrypt one block of data as TAES−Enc = 6168 processing cycles.
- 11. RSU Deployment Cost  Increasing the number of RSUs (NRSU) leads to more RSU coverage and, consequently, less packet delays and higher delivery success ratio.  For ex. Lets consider NRSU between 1 and 20 in a 9 ×9 km2 area, which corresponds to varying the RSU density between 0.012 and 0.25 RSUs per Km2. The results showed that increasing NRSU from 5 to 20 increased the packet delivery ratio from 85% to 93% and decreased the packet delay from 8 s to 5 s. This, how it comes at the expense of increasing the cost of the RSU network deployment.  Moreover, a vehicle in REACT will make a higher RSU density will lead to more handover occurrences and consequently increase the load on the network.  Hence, there is a tradeoff between improving the performance and reducing the deployment cost and network load.
- 12. CONCLUSION:  The evaluation of our proposed scheme confirmed its effectiveness compared to a recent security mechanism for VANETs. We are designing an RSU scheduling mechanism in which an RSU builds a schedule that is divided into time slots (TSs). In each  Hence, an RSU prepares users’ data and caches them during a free TS before the users connect. Using this scheme, the RSU distributes its load among the available TSs.
- 13. THANK YOU