Hifn (styled Hi/fn) was a semiconductor manufacturer founded in Carlsbad, California, in 1996 as a corporate spin-off from Stac Electronics.

[1] The company was later headquartered in Los Gatos, California, and had offices in North America, Europe and Asia.

In 2001, the company announced a security processor featuring the Advanced Encryption Standard (AES) algorithm.

In earlier 2004, Hifn acquired part of IBM Network Processor assets in addition to PowerNP's intellectual property license.

On April 3, 2009, semiconductor manufacturer Exar Corporation closed the acquisition of Hifn.