Discover Card Master Trust I 10-K 2017 FY Annual report

Exhibit 31.1

Certification

I, Michael F. Rickert, certify that:

1. I have reviewed this report on Form10-K and all reports on Form10-D required to be filed in respect of the period covered by this report on Form10-K of Discover Card Master Trust I and Discover Card Execution Note Trust (the “Exchange Act periodic reports”);

2. Based on my knowledge, the Exchange Act periodic reports, taken as a whole, do 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, all of the distribution, servicing and other information required to be provided under Form10-D for the period covered by this report is included in the Exchange Act periodic reports;

4. Based on my knowledge and the servicer compliance statements required in this report under Item 1123 of Regulation AB, and except as disclosed in the Exchange Act periodic reports, the servicers have fulfilled their obligations under the servicing agreements in all material respects; and

5. All of the reports on assessment of compliance with servicing criteria for asset-backed securities and their related attestation reports on assessment of compliance with servicing criteria for asset-backed securities required to be included in this report in accordance with Item 1122 of Regulation AB and Exchange Act Rules13a-18 and15d-18 have been included as an exhibit to this report, except as otherwise disclosed in this report. Any material instances of noncompliance described in such reports have been disclosed in this report on Form10-K.

In giving the certifications above, I have reasonably relied on information provided to me by the following unaffiliated party: U.S. Bank National Association.

By:	/s/ Michael F. Rickert
	Michael F. Rickert,
	Vice President, Chief Financial Officer and Treasurer of Discover Funding LLC (senior officer of the depositor in charge of securitization)

By:	/s/ Michael F. Rickert
	Michael F. Rickert,
	Vice President, Chief Financial Officer and Assistant Treasurer of Discover Bank (senior officer in charge of servicing function)

Date: March 22, 2018