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Designed first by Bruce Shneier, blowfish encryption is a block cipher which uses key depended S-boxes. S-box is a substitution box which replaces the original data into an encrypted data as per a key dependent schedule. Encryption is very secure and there has been no publicly known cryptanalysis of it to date, making it one of the strongest and most secure techniques of encryption. Preprocessing of plain text of a size as large as some four kilobytes is required for every new key to be used in encryption and it explains the amount of security attained as a result. It has been popular mainly due to its free use as it was not patented by its designer. It occupies a very small size of just four kilobytes of RAM and hence can be used on the oldest desktops and other devices.
Blowfish encryption has since been used in applications very successfully. It is safe, reliable and hacking resistant. Its utility can be gauged from the fact that its successors were also designed from the same technique as used in blowfish but just changed the block sizes.