Various cryptography algorithms have developed to provide different levels of data security for application domains, such as storage security, personal identification, and secure web browsing. They consume massive amount of resource on the server-side while processing encrypting and decrypting requests from clients. In this paper, we try to utilize GPU (Graphics Processing Unit) to speed up the data encryption and decryption to reduce the computing resource spent on security and to improve the web server throughput. We chose the widely-used 3-DES and implemented it on GPU. In our implementation, we observed the GPU cipher performs 5 times faster than the OpenSSL implementation on CPU. As a result, we show a promising direction for offloading the data encryption and decryption onto GPU.