Dated: 3/29/2007
In giving the certifications above, I have reasonably relied on information provided to me by the following unaffiliated
parties:
By: /s/
Bruce Kaiserman
Title:
Vice President
Credit Suisse First Boston Mortgage Securities Corp.
I, Bruce Kaiserman, certify that:
1. I have reviewed this report on Form 10-K and all reports on Form 10-D required to be filed in respect of the period
covered by this report on Form 10-K of Credit Suisse First Boston Mortgage Securities Corp. CSFB Home Equity Asset Trust
2006-4 (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 Form 10-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 Rules 13a-18 and 15d-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 Form 10-K.
Bruce Kaiserman
Exhibit 31 : Rule 13a-14(d)/15d-14(d) Certifications
J.P. Morgan Trust Company, N.A, as Custodian
JP Morgan Chase Bank, N.A., as Servicer
LaSalle Bank National Association, as Custodian
Select Portfolio Servicing, Inc., as Servicer and Special Servicer
The Bank of New York and The Bank of New York Trust Company, as Successor in interest to J.P. Morgan
Trust Company, as Custodian
U.S. Bank National Association, as Trustee
Wells Fargo Bank, N.A., as Custodian
Wells Fargo Bank, N.A., as Servicer
Chase Home Finance LLC, as Sub-servicer for JPMorgan Chase Bank, N.A., as Servicer