A group key is a shared secret used by a group of users to encrypt or decrypt messages. In scenarios where multiple parties need to communicate securely, a group key allows them to do so without exposing their individual keys.This key can be generated using various methods, often involving cryptographic algorithms. It ensures that only members of the group can access the information exchanged among them. When data is encrypted with a group key, even if someone intercepts the information, they cannot read it without the key.Group keys can change periodically, ensuring continued security. This is especially important as new members join or leave the group, or if there is a suspicion that the key may have been compromised.Using group keys enhances privacy and security in communications, paving the way for decentralized applications and collaborative projects. Overall, they play a crucial role in maintaining confidentiality in multi-user environments.