EXHIBIT 31

Certification of Chief Executive OfficerSecurity Capital Assurance LtdPursuant to Section 302 of the Sarbanes-Oxley Act of 2002(Chapter 98, Title 15 U.S.C. 7241)

I, Paul S. Giordano, certify that:

|1. | I have reviewed this Annual Report on Form 10-K of Security Capital Assurance Ltd;                                                                                                                                                                                                                                                   
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|2. | Based on my knowledge, this report does 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, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows
of the registrant as of, and for, the periods presented in this report;                                              
|  
|4. | The registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a- 15(e) and 15d-15(e)) and
internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
|  
|   | a)                                                                                                                                                                                                                                                                                                                                   
|  
|   | b)                                                                                                                                                                                                                                                                                                                                   
|  
|   | c)                                                                                                                                                                                                                                                                                                                                   
|  
|   | d)                                                                                                                                                                                                                                                                                                                                   
|  

---



5.
	The registrants other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants auditors and the audit
committee of the registrants board of directors (or persons performing the equivalent functions):a)
	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrants ability to
record, process, summarize and report financial information; andb)
	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal control over financial reporting. Dated: March 17, 2008 /s/
      Paul S. GiordanoPAUL S. GIORDANOPresident and Chief ExecutiveOfficerSecurity Capital Assurance Ltd


---



Certification of Chief Financial OfficerSecurity Capital Assurance LtdPursuant to Section 302 of the Sarbanes-Oxley Act of 2002(Chapter 98, Title 15 U.S.C. SS. 7241)

I, David P. Shea, certify that:

|1. | I have reviewed this Annual Report on Form 10-K of Security Capital Assurance Ltd;                                                                                                                                                                                                                                                   
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|2. | Based on my knowledge, this report does 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, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows
of the registrant as of, and for, the periods presented in this report;                                              
|  
|4. | The registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a- 15(e) and 15d-15(e)) and
internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
|  
|   | a)                                                                                                                                                                                                                                                                                                                                   
|  
|   | b)                                                                                                                                                                                                                                                                                                                                   
|  
|   | c)                                                                                                                                                                                                                                                                                                                                   
|  
|   | d)                                                                                                                                                                                                                                                                                                                                   
|  

---



|   | reporting; and                                                                                                                                                                                                                                                                                 
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|5. | The registrants other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants auditors and the audit
committee of the registrants board of directors (or persons performing the equivalent functions):
|  
|   | a)                                                                                                                                                                                                                                                                                             
|  
|   | b)                                                                                                                                                                                                                                                                                             
|  

Dated: March 17, 2008

/s/
      David P. SheaDAVID P. SHEAExecutive Vice President andChief Financial OfficerSecurity Capital Assurance Ltd


---