The primary objective of any computer security algorithm is that the untrusted third party should not be able to read or gain knowledge about the data being communicated or stored in different internet applications or storage platforms. One of the most prevalent fiestel network block cipher is Blowfish, which is capable to safeguard the protected data against attacks. Blowfish algorithm is a form of symmetric key cipher that can be defined as a drop in alternative for the existing standard block ciphers. It yields alterable length key from 32-448 bits. This paper presents a brief survey on Blowfish algorithm.