To the management of Entrust Datacard Limited (formerly known as Entrust Limited, hereinafter Entrust ) and Trend Micro, Inc.

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1 Audit Tax Advisory Grant Thornton LLP 2001 Market Street, Suite 700 Philadelphia, PA T F Report of Independent Practitioner To the management of Entrust Datacard Limited (formerly known as Entrust Limited, hereinafter Entrust ) and Trend Micro, Inc. ( Trend Micro ): We have examined Entrust and Trend Micro management s assertions that for their Certification Authority (CA) operations at Santa Clara, California and Norcross, Georgia, USA, throughout the following periods: As to the Root CAs listed on Attachment A for the period April 1, 2016 to June 7, 2016, and As to the Issuing CAs listed on Attachment B and CA operations for the period April 1, 2016 to January 29, 2017, Entrust and Trend Micro have: disclosed its extended validation SSL ( EV SSL ) certificate lifecycle management business practices in their Certificate Practices Statements as enumerated in Attachment C, including their commitment to provide EV SSL certificates in conformity with the CA/Browser Forum Guidelines on the AffirmTrust website, and provided such services in accordance with their disclosed practices maintained effective controls to provide reasonable assurance that: o the integrity of keys and EV SSL certificates it manages is established and protected throughout their lifecycles; and o EV SSL subscriber information is properly authenticated (for the registration activities performed by Entrust and Trend Micro) based on the WebTrust Principles and Criteria for Certification Authorities Extended Validation SSL v Entrust s and Trend Micro s management is responsible for its assertions. Our responsibility is to express an opinion on management s assertions based on our examination. We conducted our examination in accordance with standards for attestation engagements established by the American Institute of Certified Public Accountants and, accordingly, included:

2 (1) obtaining an understanding of Entrust s and Trend Micro s EV SSL certificate lifecycle management business practices, including its relevant controls over the issuance, renewal, and revocation of EV SSL certificates; (2) selectively testing transactions executed in accordance with disclosed EV SSL certificate lifecycle management practices; (3) testing and evaluating the operating effectiveness of the controls; and (4) performing such other procedures as we considered necessary in the circumstances. We believe that our examination provides a reasonable basis for our opinion. The relative effectiveness and significance of specific controls at Entrust and Trend Micro and their effect on assessments of control risk for subscribers and relying parties are dependent on their interaction with the controls, and other factors present at individual subscriber and relying party locations. We have performed no procedures to evaluate the effectiveness of controls at individual subscriber and relying party locations. Because of the nature and inherent limitations of controls, Entrust s and Trend Micro s ability to meet the aforementioned criteria may be affected. For example, controls may not prevent, or detect and correct, error, fraud, unauthorized access to systems and information, or failure to comply with internal and external policies or requirements. Also, the projection of any conclusions based on our findings to future periods is subject to the risk that changes may alter the validity of such conclusions. In our opinion, throughout the period April 1, 2016 to January 29, 2017, Entrust and Trend Micro management s assertions, as referred to above, are fairly stated, in all material respects, based on the WebTrust Principles and Criteria for Certification Authorities Extended Validation SSL v This report does not include any representation as to the quality of Entrust s and Trend Micro s services beyond those covered by the WebTrust Principles and Criteria for Certification Authorities Extended Validation SSL v1.4.5, nor the suitability of any of Entrust s or Trend Micro s services for any customer's intended purpose. Grant Thornton LLP Philadelphia, Pennsylvania June 30, 2017

3 ATTACHMENT A LIST OF IN SCOPE ROOT CAs Root CAs AffirmTrust Commercial Serial no: 77:77:06:27:26:A9:B1:7C SHA-1 Thumbprint: F9:B5:B6:32:45:5F:9C:BE:EC:57:5F:80:DC:E9:6E:2C:C7:B2:78:B7 AffirmTrust Networking Serial no: 7C:4F:04:39:1C:D4:99:2D SHA-1 Thumbprint: 29:36:21:02:8B:20:ED:02:F5:66:C5:32:D1:D6:ED:90:9F:45:00:2F AffirmTrust Premium Serial no: 6D:8C:14:46:B1:A6:0A:EE SHA-1 Thumbprint: D8:A6:33:2C:E0:03:6F:B1:85:F6:63:4F:7D:6A:06:65:26:32:28:27 AffirmTrust Premium ECC Serial no: 74:97:25:8A:C7:3F:7A:54 SHA-1 Thumbprint: B8:23:6B:00:2F:1D:16:86:53:01:55:6C:11:A4:37:CA:EB:FF:C3:BB ATTACHMENT B LIST OF IN SCOPE ISSUING CAs Issuing CAs [Certificate Type] Trend Micro CA [OV and EV] Serial no: 3D:84:7C:1B:4A:BB:32:02 SHA-1 Thumbprint: 2C:DD:A6:CE:33:E1:FE:7C:1B:05:41:1F:17:A6:66:A7:83:D7:F5:6A Trend Micro S2 CA [OV and EV] Serial no: 5B:46:99:90:EC:75:9D:34 SHA-1 Thumbprint: E2:7C:71:03:AD:E2:D6:F3:40:7E:05:AD:05:28:EE:89:C3:63:6E:85 AffirmTrust Commercial Extended Validation CA [EV] Serial no: 63:1B:F9:0C:8A:B0:2C:81 SHA-1 Thumbprint: 81:2F:ED:60:49:9B:92:C5:A8:06:AD:F7:6B:6C:34:C2:3B:2D:08:57 AffirmTrust Networking Extended Validation CA [EV] Serial no: 23:90:15:C7:F6:78:80:46 SHA-1 Thumbprint: 29:81:D1:9F:DB:BE:47:39:91:3C:CE:EF:5A:B0:52:E2:D7:77:14:E9

4 AffirmTrust Premium Extended Validation CA [EV] Serial no: 0B:CF:CF:37:59:C2:F5:86 SHA-1 Thumbprint: 5B:A0:2E:26:95:0A:40:B3:59:3D:C9:E3:DE:A8:C7:C5:A3:AF:42:C6 AffirmTrust Premium ECC Extended Validation CA [EV] Serial no: 10:7C:AA:12:EC:D6:8C:54 SHA-1 Thumbprint: 7F:B9:17:9F:3F:78:03:B3:C9:96:45:FE:C8:2F:28:79:26:B9:90:55 Trend Micro Gold CA [OV and EV] Valid until: November 2, 2019 Serial no: 00:84:3C:74:B1:AA:34:86:B1:C4:C7:A0:DF:55:B5:E9 SHA-1 Thumbprint: D3:0A:E0:1F:70:BB:BF:F3:6B:2C:EA:DE:0A:A0:F8:C7:AA:82:21:1C Trend Micro Silver CA [OV and EV] Valid until: November 2, 2019 Serial no: 00:83:55:1B:D2:38:4F:68:E0:42:05:B8:37:D4:8D:87 SHA-1 Thumbprint: 8B:78:C4:59:FB:11:83:BE:10:27:6B:9C:6B:62:30:81:C8:49:36:57 ATTACHMENT C LIST OF AFFIRMTRUST CERTIFICATION PRACTICE STATEMENTS CPS Name Version Date Trend Micro SSL Certification Practice Statement November 2015 Entrust Trend Micro SSL Certification Practice Statement April 2016 AffirmTrust Certification Practice Statement December 2016

5 Entrust Datacard Corporate Headquarters 1187 Park Place Shakopee, MN USA ENTRUST MANAGEMENT S ASSERTION Entrust Datacard Limited (formerly known as Entrust Limited, hereinafter Entrust ) operates the Certification Authority (CA) services known as AffirmTrust from roots and Subordinate CAs as enumerated in Attachment A, and provides Extended Validation SSL ( EV SSL ) CA services. The management of Entrust is responsible for establishing and maintaining effective controls over its EV SSL CA operations, including its EV SSL CA business practices disclosure on its website, EV SSL key lifecycle management controls, and EV SSL certificate lifecycle management controls. These controls contain monitoring mechanisms, and actions are taken to correct deficiencies identified. There are inherent limitations in any controls, including the possibility of human error, and the circumvention or overriding of controls. Accordingly, even effective controls can only provide reasonable assurance with respect to Entrust s Certification Authority operations. Furthermore, because of changes in conditions, the effectiveness of controls may vary over time. Entrust management has assessed its disclosures of its certificate practices and controls over its EV SSL CA services. Based on that assessment, in Entrust management s opinion, in providing its EV SSL Certification Authority (CA) services at Santa Clara, California and Norcross, Georgia US, throughout the period April 29, 2016 to January 29, 2017, Entrust has: disclosed its extended validation SSL ( EV SSL ) certificate lifecycle management business practices in its Certification Practice Statements as enumerated in Attachment B, including its commitment to provide EV SSL certificates in conformity with the CA/Browser Forum Guidelines on the Entrust website, and provided such services in accordance with its disclosed practices maintained effective controls to provide reasonable assurance that: o the integrity of keys and EV SSL certificates it manages is established and protected throughout their lifecycles; and o EV SSL subscriber information is properly authenticated (for the registration activities performed by Entrust)

6 based on the WebTrust Principles and Criteria for Certification Authorities Extended Validation SSL v Very truly yours, Kirk R. Hall Director Policy and Compliance SSL June 30, 2017

7 ATTACHMENT A LIST OF IN SCOPE ROOT CAs Root CAs AffirmTrust Commercial Serial no: 77:77:06:27:26:A9:B1:7C SHA-1 Thumbprint: F9:B5:B6:32:45:5F:9C:BE:EC:57:5F:80:DC:E9:6E:2C:C7:B2:78:B7 AffirmTrust Networking Serial no: 7C:4F:04:39:1C:D4:99:2D SHA-1 Thumbprint: 29:36:21:02:8B:20:ED:02:F5:66:C5:32:D1:D6:ED:90:9F:45:00:2F AffirmTrust Premium Serial no: 6D:8C:14:46:B1:A6:0A:EE SHA-1 Thumbprint: D8:A6:33:2C:E0:03:6F:B1:85:F6:63:4F:7D:6A:06:65:26:32:28:27 AffirmTrust Premium ECC Serial no: 74:97:25:8A:C7:3F:7A:54 SHA-1 Thumbprint: B8:23:6B:00:2F:1D:16:86:53:01:55:6C:11:A4:37:CA:EB:FF:C3:BB ATTACHMENT B LIST OF AFFIRMTRUST CERTIFICATION PRACTICE STATEMENTS CPS Name Version Date Entrust Trend Micro SSL Certification Practice Statement April 2016 AffirmTrust Certification Practice Statement December 2016

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