**EXHIBIT 31.1**

 

### **Rule13a-14(a)/15d-14(a)**CERTIFICATION

 

I, Patrick F. O’Neal, certify that:

 

1.             I have reviewed this quarterlyreport on Form 10-QSBfor the quarterly period ending December 31, 2003 of Sento Corporation;

 

2.             Based on myknowledge, this report does not contain any untrue statement of a material factor omit to state a material fact necessary to make the statements made, inlight of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

 

3.             Based on my knowledge, the financial statements, andother financial information included in this report, fairly present in allmaterial respects the financial condition, results of operations and cash flowsof the small business issuer as of, and for, the periods presented in thisreport;

 

4.             The small business issuer’s other certifying officer(s)and I are responsible for establishing and maintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for thesmall business issuer and have:

 

(a)           designed such disclosure controls andprocedures, or caused such disclosure controls and procedures to be designedunder our supervision, to ensure that material information relating to thesmall business issuer, including its consolidated subsidiaries, is made knownto us by others within those entities, particularly during the period in whichthis report is being prepared;

 

(b)           evaluated the effectiveness of thesmall business issuer’s disclosure controls and procedures and presented inthis report our conclusions about the effectiveness of the disclosure controlsand procedures, as of the end of the period covered by this report based onsuch evaluation; and

 

(c)           disclosed in this report any changein the small business issuer’s internal control over financial reporting thatoccurred during the small business issuer’s most recent fiscal quarter (thesmall business issuer’s fourth fiscal quarter in the case of an annual report)that has materially affected, or is reasonably likely to materially affect, thesmall business issuer’s internal control over financial reporting; and

 

5.             The small business issuer’s other certifying officer(s)and I have disclosed, based on our most recent evaluation of internal controlover financial reporting, to the small business issuer’s auditors and the auditcommittee of the small business issuer’s board of directors (or personsperforming the equivalent functions):

 

(a)           all significant deficiencies andmaterial weaknesses in the design or operation of internal control overfinancial reporting which are reasonably likely to adversely affect the smallbusiness issuer’s ability to record, process, summarize and report financialinformation; and

 

(b)           any fraud, whether or not material,that involves management or other employees who have a significant role in thesmall business issuer’s internal control over financial reporting.

 

 

Date: February 9, 2004

 

 
|   |   |   |   |   /s/ PATRICK F. O’ NEAL |   |
|--------|--------|--------|--------|-----------------------------------------|--------|
|   |   |   |   |                                    |   |
|   |   |   |   | Patrick F. O’Neal                  |
|   |   |   |   |                                    |
|   |   |   |   | President and Chief Executive Officer   |

 

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