**Exhibit      12.1**

**CERTIFICATION      OF THE CHIEF EXECUTIVE OFFICER **

**PURSUANT      TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002**

| 1.   | I                have reviewed this annual report on Form 20-F of Aladdin Knowledge                Systems                Ltd. (the “Company”); |
|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 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; |
|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 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; |
|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 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)) and internal                control over financial reporting (as defined in Exchange Act Rules                13a-15(f) and 15d-15(f)) for the Company and have: |
|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 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): |
|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   |   |   |                                                                                                                    |
|--------|--------|--------|-------------------------------------------------------------------------------------------------------------------------|
|        |   |   | By/s/              Jacob (Yanki) Margalit                                                                               |
|        |   |   | Jacob                (Yanki) MargalitChief                Executive Officer(Principal                Executive Officer) |
|   |   |   |                                                                                                                    |

----