Key Technology (KTEC) 10-Q 2006 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Key Technology, Inc. (the "Company") on Form 10-Q for the period ending June 30, 2006 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Thomas C. Madsen, Chairman of the Board of Directors of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Thomas C. Madsen

Thomas C. Madsen

Chairman of the Board

August 11, 2006