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Data aggregation is a technique used to conserve battery power in wireless sensor networks (WSN). When securing such a network, it is important that we minimize the number of computationally expensive security operations without compromising on the security. This talk deals with the test-bed implementation of our end to end secure data aggregation algorithm. Unlike previous algorithms which required separate phases for secure aggregation and integrity verification, ours does not require an additional phase for verification. This saves energy by avoiding additional transmissions and computation overhead on the sensor nodes. We have implemented our secure data aggregation algorithms on mica2 motes. To sum up our objectives as follows: 1. An encryption algorithm for data confidentiality which will allow us to aggregate encrypted data in a wireless sensor network. 2. An aggregate digital signature algorithm to preserve data integrity which allows us to aggregate digital signatures. 3. An implementation of these algorithms which is efficient in computational and communicational aspects in energy constrained environments.