EXHIBIT 31.2

CERTIFICATION PURSUANT
TOSECTION 302THE SARBANES-OXLEY ACT OF
2002

I, William R. Walker, certify that:

|1. | I
have reviewed this annual report on Form 10-K of hi/fn, inc.;
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|2. | Based
on my knowledge, this report does not contain any untrue statement of a
               material fact or omit to state a material fact necessary in order to make
the                statements made, in light of the circumstances under which such
statements were                made, not misleading with respect to the period covered by
this report;
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|3. | Based
on my knowledge, the financial statements, and other financial information
               included in this report, fairly present in all material respects the
financial                condition, results of operations and cash flows of the
registrant as of, and                for, the periods presented in this report;
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|4. | The
registrants other certifying officer and I are responsible for
               establishing and maintaining disclosure controls and procedures (as
defined in                Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal
control over financial                reporting for the registrant and have:
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| | a) | Designed such disclosure controls and procedures, or caused such disclosure
               controls and procedures to be designed under our supervision, to ensure that
               material information relating to the registrant, including its consolidated
               subsidiaries, is made known to us by others within those entities, particularly
               during the period in which this report is being prepared;
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| | b) | Designed such internal control over financial reporting, or caused such internal
               control over financial reporting to be designed under our supervision, to
               provide reasonable assurance regarding the reliability of financial reporting
               and the preparation of financial statements for external reporting purposes in
               accordance with generally accepted accounting principles;
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| | c) | Evaluated the effectiveness of the registrants disclosure controls and
               procedures and presented in this report our conclusions about the effectiveness
               of the disclosure controls and procedures as of the end of the period covered by
               this report based on such evaluation; and
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| | d) | Disclosed in this report any change in the registrants internal control
               over financial reporting that occurred during the registrants most recent
               fiscal quarter (the registrants fourth fiscal quarter in the case of an
               annual report) that has materially affected, or is reasonably likely to
               materially affect, the registrants internal control over financial
               reporting; and
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|5. | The registrants other certifying officer and I have disclosed, based on
          our most recent evaluation of internal controls over financial reporting, to the
          registrants auditors and the audit committee of the registrants
          board of directors (or persons performing the equivalent functions):
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| | a) | All significant deficiencies and material weaknesses in the design or operation
               of internal controls over financial reporting which are reasonable likely to
               adversely affect the registrants ability to record, process, summarize and
               report financial information; and
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| | b) | Any fraud, whether or not material, that involves management or other employees
               who have a significant role in the registrants internal controls over
               financial reporting.
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|December 14, 2005 |  | /s/ WILLIAM R. WALKER
William R. WalkerChief Financial Officer
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