Abstract: Unattended wireless sensor networks operating in hostile environments face the risk of compromise．Given the unattended nature,sensors must safeguard their sensed data of high value temporarily．However,saving data inside a network creates security problems due to the lack of tamper-resistance of sensors and the unattended nature of the network．In some occasions,a network controller may periodically dispatch mobile sinks to collect data．If a mobile sink is given too many privileges,it will become very attractive for attack．Thus,the privilege of mobile sinks should be restricted．Additionally,secret keys should be used to achieve data confidentiality,integrity,and authentication between communicating parties．To address these security issues,we present mAKPS,an asymmetric key predistribution scheme with mobile sinks,to facilitate the key distribution and privilege restriction of mobile sinks.

Key words: Key predistribution,Mobile sink,Security,Wireless sensor network