EXHIBIT 12.2

I, Erez Rosen, certify
that:

|1. | I
have reviewed this annual report on Form 20-F of Aladdin Knowledge Systems Ltd.;
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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 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 company as of, and for, the          periods
presented in this report;
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|4. | The
company's other certifying officer(s) 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)) for the company and have:
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| |  | 
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| | (a) | Designed
such disclosure controls and procedures or caused such disclosure controls and procedures
designed under our                   supervision, to ensure that material information
relating to the company, 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) | Evaluated
the effectiveness of the company'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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| | (c) | Disclosed
in this report any change in the company's internal control over financial reporting that
occurred during the                   period covered by the annual report that has
materially affected, or is reasonably likely to materially affect, the
                  company's internal control over financial reporting; and
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|5. | The
company's other certifying officer(s) and I have disclosed, based on our most recent
evaluation of internal control over          financial reporting, to the company's
auditors and the audit committee of the company'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
control over financial                   reporting which are reasonably likely to
adversely affect the company'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                   company's internal control over financial
reporting.
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Dated: May 31, 2005

| | By: /s/
      Erez Rosen
              Erez Rosen
              Chief Financial Officer
              (Principal Financial Officer)
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