The total number of possible values of keys in a cryptographic algorithm or other security measure such as a password. For example, a 20-bit key would have a key space of 1,048,576. See binary values, key length and key fingerprint.
"key space." YourDictionary, n.d. Web. 10 June 2018. <http://www.yourdictionary.com/key-space>.
key space. (n.d.). Retrieved June 10th, 2018, from http://www.yourdictionary.com/key-space