Exhibit 32.1

CERTIFICATIONS OF

CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Hilary Schneider, Chief Executive Officer and President of LifeLock, Inc. (“LifeLock”), certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that LifeLock’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2016, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in LifeLock’s Quarterly Report on Form 10-Q fairly presents in all material respects LifeLock’s financial condition and results of operations.

/s/ Hilary Schneider

Hilary Schneider

Chief Executive Officer and President

(Principal Executive Officer)

November 8, 2016

I, Douglas Jeffries, Chief Financial Officer and Chief Administrative Officer of LifeLock, Inc. (“LifeLock”), certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that LifeLock’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2016, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in LifeLock’s Quarterly Report on Form 10-Q fairly presents in all material respects LifeLock’s financial condition and results of operations

/s/ Douglas Jeffries

Douglas Jeffries

Chief Financial Officer and Chief Administrative Officer

(Principal Financial and Accounting Officer)

November 8, 2016

This certification accompanies the Quarterly Report on Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any LifeLock, Inc. filing under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Quarterly Report on Form 10-Q), irrespective of any general incorporation language contained in such filing.

A signed original of these written statements required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to LifeLock, Inc. and will be retained by LifeLock, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.