Which hacking method involves forging the from address so that replies go to an unintended audience?

Spyware is a type of malicious software designed to gather information about a person or organization without their knowledge. It often operates in the background, collecting data such as browsing habits or personal information, but it does not specifically involve falsifying sender addresses to mislead recipients.

Hoaxes refer to deceptive messages that are intended to trick individuals into believing false information or participating in a scam. While they can mislead and manipulate, hoaxes do not inherently involve the technical act of altering the sender's address as seen in spoofing.

Packet tampering involves intercepting and altering data packets being transmitted over a network. This method focuses on modifying the contents of data being sent rather than changing the sender's address to mislead the recipient, which is the key characteristic of spoofing.