Hardware or software in which some knowledge of its internal workings are known by the user or tester. See gray box testing and black box.
"gray box." YourDictionary, n.d. Web. 17 August 2018. <http://www.yourdictionary.com/gray-box>.
gray box. (n.d.). Retrieved August 17th, 2018, from http://www.yourdictionary.com/gray-box