Exhibit 99.1 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 Krupp Insured Plus Limited Partnership (the "Partnership") on Form 10-Q for the period ending March 31, 2003 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Douglas Krupp, Co-Chairman (Principal Executive Officer), President and Director of The Krupp Corporation, a General Partner of the Partnership, certify, pursuant to U.S.C. ss. 1350, as adopted pursuant to ss. 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 Partnership as of March 31, 2003 (the last date of the period covered by the Report). /s/ Douglas Krupp - -------------------------------- Douglas Krupp, Principal Executive Officer