U Shield was launched by Industrial and Commercial Bank of China in 2003. It is a "smart guardian" dedicated to protecting the safety of online banking customers. It is an advanced security tool for netizens to handle online banking business. Because it looks like a U disk, it plays the role of a protective shield for online banking accounts, so it is called a U shield. U Shield is a built-in micro smart card processor, which uses 1024-bit asymmetric key algorithm to encrypt, decrypt and digitally sign online data to ensure the confidentiality, authenticity, integrity and non-repudiation of online transactions.