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A major advantage of service-based computing technology is the ability to enable rapid formation of distributed computing systems by composing massively available services over various types of networks. Their confidentiality and privacy should be well protected under various situations. This paper proposed a control-based approach to balance the trade-off between security and performance of Adaptive Service-Based Systems (ASBS). The relationship between encryption/decryption delay and the content size for cryptographic algorithms providing different security levels are measured and modeled. An example application based on the ASBS prototype is implemented to demonstrate the effectiveness of the proposed approach.