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 Annual Report of the Telcordia Technologies 401(k) Savings Plan (the “Plan”) on Form 11-K for the year ended December 31, 2002 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned individuals does hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his or her knowledge:

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

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

Date:	June 27, 2003
By:	/s/ Elaine Kalin
	Elaine Kalin, Vice President
	and Director of Retirement Programs
	Science Applications International Corporation
By:	/s/ Byron Litsey
	Byron Litsey, Accounting Manager,
	Retirement Programs
	Science Applications International Corporation

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate disclosure document. This certification shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (“Exchange Act”) or otherwise subject to liability under that section. This certification shall not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Exchange Act except to the extent this Exhibit 99.1 is expressly and specifically incorporated by reference in any such filing.