Information about the Yellow Book in Information security, explanation,what year it was published, classes and for what purpose

The Yellow Book is a guidance on Information Assurance (IA) for the UK government. It was first published in 1998 by the Communications Electronics Security Group (CESG) of the UK government. The book contains a series of classes - A, B, C, D and E - that deems the security level of different types of information. This helps organizations to assess the risks of unauthorized access to classified information. A security class is assigned to all information based on its sensitivity, importance, and consequences of compromise. All information within an organization should be assigned a class based on how it needs to be protected. This allows for more accurate security measures to be put in place for protection. The Yellow Book is regularly updated to remain up to date with cyber-security advancements and changes in requirements.