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As Wireless Sensor Networks (WSN) continue to grow, so does the need for effective security mechanisms. Enhancing the efficiency of these networks requires more security to provide integrity, authenticity and confidentiality of the data flowing through the network. Encryption is one of the most common tools used to provide security services for WSNs. There has been an enormous research potential in the field of encryption algorithms in WSNs. Algorithms, protocols, and implementations consist the main aspects the security specialist should consider to assess the efficiency of the protection approaches. In this survey, we review the most significant approaches that have been proposed to provide encryption-based security services for WSNs. We also emphasize on the weaknesses of these approaches.