Advances in digital content transmission have been increased in the past few years. Security and privacy issues of the transmitted data have become an important concern in multimedia technology. In this paper, the authors propose a computationally efficient and secure video encryption algorithm. This makes secure video encryption feasible for real time applications without any extra dedicated hardware. In addition, special and reliable security in storage and transmission of digital images and videos is needed in many digital applications such as confidential video conferencing and medical imaging systems, etc.