is a block cipher
developed by the Korea Information Security Agency (KISA). It is used broadly throughout South Korean
industry, but seldom found elsewhere. It gained popularity in Korea because 40-bit encryption
was not considered strong enough, so the Korea Information Security Agency developed its own standard. However, this decision has historically limited the competition of web browsers
in Korea, as no major SSL libraries or web browsers supported the SEED algorithm, requiring users to use an ActiveX
control in Internet Explorer
for secure web sites.