• Er. KANCHAN THOOL
• Dr. UMESH KUMAR SINGH

This paper describes the link layer architecture and block cipher. The Tinysec library implementation was provided with 2 ciphers (skipjack and RC5) and block cipher mode( CBC) . The Tinysec library provides opportunity to replace the cipher and block cipher mode with one of our choice. In our analysis we used Misty1 as block cipher and OCB as block cipher mode. Misty1 is a block cipher based on nested Feistel network with variable number of rounds (typically 8). It uses a 128 bits sized crypto variable and block size of 64 bits. In this paper, we emphasis on energy requirement, RAM requirement and throughput by misty1 block cipher and OCB block cipher mode in Tinysec link layer architecture. A Wireless Sensor Network (WSN) consists of sensors to monitor physical or environmental conditions and pass their data through the network through switch station to main station and basically deployed in non accessible area. The WSN is built of several no. of nodes connected to one or several sensors. Node consists of radio transceiver with antenna, energy source and microcontroller. Wireless sensor network is only option to study the remote area where human access is not possible and gives opportunity to explore more area. Contributions of this work are as follows: Implementation of Misty1 cipher and Ocb block cipher mode in tinysec library to decrease the energy consumption, increases throughput and provide more security. We simulated the ciphers and modes implemented in NesC, Tinysec library. We used TOSSIM and AVRORA as the WSN simulator. The NesC compiler gives us output, the RAM requirement.. AVRORA allows us to analysis more details of execution of program and diagnoses of performance and problems before deployed on the target hardware. From AVRORA, we get result of energy consumption and throughput of for cipher and block cipher used.

Wireless Sensor Networks, Link Layer Security, Block Cipher, Encryption, Authentication, Misty1 cipher, OCB block cipher mode, energy requirement, throughput, tinysec library, wireless sensor network security, link layer architechture.

"PERFORMANCE ANALYSIS OF MISTY1 CIPHER AND OCB BLOCK CIPHER MODE IN TINYSEC LIBRARY FOR WIRELESS SENSOR NETWORK SECURITY", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 2, page no.d702-d708, February-2022, Available :http://www.jetir.org/papers/JETIR2202389.pdf

"PERFORMANCE ANALYSIS OF MISTY1 CIPHER AND OCB BLOCK CIPHER MODE IN TINYSEC LIBRARY FOR WIRELESS SENSOR NETWORK SECURITY", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 2, page no. ppd702-d708, February-2022, Available at : http://www.jetir.org/papers/JETIR2202389.pdf