There is a major concern in the field of Wireless Sensor Networks regarding information security in very large infrastructures, where classical security models cannot be applied due to the very strict resource constraints of network nodes. For this, identity based cryptographic schemes, distributed key generators and hierarchical security infrastructures have been intensively discussed but, from our knowledge, no proposals have been made that would also cover two very important issues regarding this type of security systems - secure key issuing and key escrow. We are proposing such a security scheme that would benefit from both hierarchical and distributed approaches, with special attention to key escrow and key issuing. Also, we are envisioning some applications that would benefit from such a security scheme.
