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Block Information

  Name SEED
  Designers KISA
  Publish Date 1998
  Key Size 128 bits
  Block Size 128 bits
  Structure Nested Feistel Network
  Rounds 16


SEED is a Block Cipher developed by the Korean Information Security Agency . It is used broadly throughout South Korea n industry, but seldom found elsewhere. It gained popularity in Korea because 40 bit SSL was not considered strong enough (see Transport Layer Security#Early Short Keys ), so the Korean Information Security Agency developed its own standard. However, this decision has limited the competition of Web Browser s in Korea, as no major SSL libraries or web browsers currently support the SEED algorithm, and users are limited to using ActiveX components with Internet Explorer for secure web sites.1

SEED is a 16-round s such that each output bit depends on 3 of the 4 input bytes.

SEED has a fairly complex Key Schedule , generating its thirty-two 32-bit subkeys through application of its G-function on a series of rotations of the raw key, combined with round constants derived (as in TEA ) from the Golden Ratio .


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