Blockcipher is not only a technology for confidentiality, but it is a fundamental general-purpose component used for many purposes including authentication, integrity, pseudo random number generations, components of a hash function and key stream generators. In the following, several application examples of blockciphers in real situations are listed.

These are only small examples. It is expected that cryptographic technologies including blockciphers will be used more and more according to the increasing demands for the information security in the future digital world.