A ciphertext, a cryptogram, an encrypted value. Usually used with the preposition "of" followed by the value that is hidden in it.
The process of obscuring information to make it unreadable without special knowledge, key files, or passwords.
A string of characters used to log in to a computer or network, to access a level in a video game, and so on; archetypally a word but nowadays often an alphanumeric string or a phrase.
A word relayed to a person to gain admittance to a place or to gain access to information.
To protect with a password.