A forgery attack is an attempt by an unauthorized entity to create a false representation of a legitimate entity's signature or message in order to gain access, mislead, or commit fraud. In the realm of message authentication codes (MACs), forgery attacks challenge the integrity and authenticity of messages by manipulating or replicating valid MACs to deceive the recipient into believing that the forged message is legitimate.
congrats on reading the definition of forgery attack. now let's actually learn it.