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The first thing to think about in network security is the protection of information(data). Information leak and falsification are serious problems for bothcompanies and individuals. Here are three countermeasures.（１）EncryptionEncryption is the conversion of data according to certain rules so that it cannotbe decrypted by a third party. It can prevent information leak of important data and can be a countermeasure against "lost" or "eavesdropping".（２）Authentication / CertificationThis countermeasure is the verification of the sender to prevent identity theft.There are two types in it.①AuthenticationFor example, if a user logs in to a server, it is "Authentication".②CertificationFor example, i