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Network Function Virtualization (NFV) and Software Defined Network (SDN) are attracting attention with the goal being enhanced networks efficiency. To enhance flexibility and to meet user requests and conditions, software implementation of communications equipment is pursued as our approach. It becomes possible to implement various optical line terminal (OLT) functions on the common hardware by realizing the functions as software. The proposed approach prevents kinds of systems from increasing and simplifies maintenance. Throughput on lower-performance software comparing with dedicated circuits is a problem. This paper focuses on a cipher algorithm for the access network as typical of the more demanding OLT functions and proposes parallel implementation on CPU/GPU resources that offers real-time processing. This paper targets the CTR and GCM which are utilized on PON systems. For …