Minimizing energy consumption of secure wireless session with QoS constraints

We investigate techniques to minimize the energy consumed by a secure wireless session without compromising the security of the session. While we have shown elsewhere (see Karri, R. and Mishra, P., submitted to ACM MOBIHOC 2002; http://emme.poly.edu/Goodies/TEMP/MOBIHOC2002.pdf) that the energy consumed by a secure session is reduced by compressing the session negotiation messages, the protocol header and the data, we now show that it is important to match the block size of compression to the data cache size of the device. We also investigate the choice of a bulk encryption algorithm (3DES vs. AES) and a key exchange protocol (Diffie-Hellman vs. RSA) based on the energy consumed by a secure wireless session. These techniques yield energy savings of 1.3× during data transmission and 1.2× during data reception beyond those obtained by techniques given in our cited paper. These techniques complement and supplement those proposed in that paper, and when combined, yield overall energy savings of 2.1× during data transmission and 4.35× during data reception.