Lesson 8 Vocabulary

An encryption technique in which two keys (a private key and a public key) are used: one to encrypt and decrypt a message. Also know as publ

The process of identifying the identity of a user who logs on to a system, or the integrity of transmitted data. 

The process of converting encrypted data back to its original form. 

A password-protected, encrypted data file containing message encryption, user identification and message text. Used to authentication a prog

An electronic stamp added to a message that uniquely identifies its source and verifies its contents at the time of the signature. 

A security technique designed to prevent access to information by converting it into a scrambled (unreadable) form of text. 

A security barrier that controls the flow of information between the Internet and a private network. It prevents outsiders from accessing an

A number generated by an algorithm from a text string. Also, known as a message digest. 

An encryption method in which hashes are used to verify the integrity of transmitted messages. Also known as one-way encryption 

An application that installs hidden services on systems. Illicit servers consist of "client" code and "server" code that enable the attacker

A subset of Internet Protocol that is most often used to determine whether a computer can communicate with the rest of the network. 

A variable value, such as a numeric code,that uses an algorithm to encrypt and decrypt data. Some applications encrypt and decrypt with the

Abbreviation for malicious software. It is software designed to harm computer systems. 

The security principle of providing proof that a transaction occurred between identified parties. Repudiation occurs when one party in a tra

Programming code that provides a temporary solution to a known problem, or bug. 

A graphic or moving image that appears on your screen when your computer is idle. 

A protocol that provides authentication and encryption, used by most servers for secure exchanges over the Internet. Superseded by Transport

A software application secretly placed on a user's system to gather information and relay it to outside parties, usually for advertising pur

An encryption method in which the same key is used to encrypt and decrypt a message. Also known as private-key encryption. 

An argument that asks "Do people have the right to remove damaging information about themselves on the Internet so the information can be fo

A protocol based on SSL 3.0 that provides authentication and encryption, used by most servers for secure exchanges over the Internet. 

A program disguised as a harmless application that actually produces harmful results. 

The unethical practice of registering domain names very similar to those of high-volume sites in hopes of receiving traffic from users seeki

A file or collection of tools that resolves system liabilities and improves software performance. 

A malicious program that replicates itself on computer systems, usually through executable software, and causes irreparable system damage. 