What type of attack includes adding an expression or phrase such as adding safe to mail headers?

Prepending is one of the stranger terms that appear on the CompTIA Security+ exam and is not a commonly used phrase in the industry. Thus, you need to know that when it is used for this exam it can mean one of three things: adding an expression or phrase to an email, subject line, or headers to either protect or fool users. They also note that it can be used when adding data as part of an attack and that social engineers may “prepend” information by inserting it into the conversation to get targets to think about things the attacker wants them to. Pretexting is a social engineering technique where attackers use a reason that is intended to be believable to the target for what they are doing. SQL injection attempts to add SQL code to a web query to gain additional access or data. Prepending is used to cover a wide variety of techniques in the Security+ exam outline that focus on adding information or data to existing content.