Network Security by Scott C.-H. C.-H. Huang David MacCallum & Ding-Zhu Du

Author:Scott C.-H. C.-H. Huang, David MacCallum & Ding-Zhu Du
Language: eng
Format: epub
Publisher: Springer US, Boston, MA

5.6 Security Protocols for Sensor Network

Security Protocols for Sensor Network (SPINS) [24] is a suite of two security building blocks which are optimized for ad hoc wireless networks. It provides important network services such as data confidentiality, two party data authentication, and data freshness through Secure Network Encryption Protocol (SNEP) and secure broadcast through Micro Timed Efficient Stream Loss-tolerant Authentication (μTESLA).

Most of the current protocols are not practical for secure broadcast as they use asymmetric digital signatures. These signatures have high cost of creation and verification. SPINS introduces μTESLA (see Sect. 5.11), an enhanced version of TESLA which uses symmetric cryptographic techniques for authentications and asymmetry cryptography only for the delayed disclosure of keys. Tight lower bound on the key disclosure delay and robustness against DoS attacks makes μTESLA a very efficient and secure protocol for data broadcast.

SNEP provides point to point communication in the wireless network. It relies on a shared counter between a sender and a receiver in order to ensure semantic security. Thus, it protects message contents of encrypted messages from eavesdroppers. Since both nodes share the counter and increment it after each block, the counter does not need to be sent with the message. In this way, the same message is encrypted differently each time. A receiver node is assured that the message originated from the legitimate node if the MAC verifies successfully. The counter value in the MAC eliminates replaying of old messages in the network.

SPINS is the first secure and lightweight broadcast authentication protocol. The computation costs of symmetric cryptography are low, and the communication overhead of 8 bytes per message is almost negligible when compared to the size of a message. SNEP ensures semantic security, data authentication, replay protection, and message freshness whereas μTESLA provides authentication for secure data broadcast.

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