Blowfish算法是一个64位分组及可变密钥长度的对称密钥分组密码算法，可用来加密64比特长度的字符串。32位处理器诞生后，Blowfish算法因其在加密速度上超越了DES而引起人们的关注。Blowfish算法具有加密速度快、紧凑、密钥长度可变、可免费使用等特点，已被广泛使用于众多加密软件。

-Blowfish is a keyed, symmetric cryptographic block cipher designed by Bruce Schneier in 1993 and placed in the public domain.　Blowfish is included in a large number of cipher suites and encryption products, including SplashID.　Blowfish’s security has been extensively tested and proven.　As a public domain cipher, Blowfish has been subject to a significant amount of cryptanalysis, and full Blowfish encryption has never been broken.　Blowfish is also one of the fastest block ciphers in public use, making it ideal for a product like SplashID that functions on a wide variety of processors found in mobile phones as well as in notebook and desktop computers.