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MORGAN & MORGAN

COMPLEX LITIGATION GROUP

John A. Yanchunis (Admitted Pro Hac Vice) 

201 N. Franklin Street, 7th Floor 

Tampa, FL 33602 

Telephone: 813/223-5505 

813/223-5402 (fax) 

jyanchunis@ForThePeople.com 

ROBBINS GELLER RUDMAN 

& DOWD LLP

Stuart A. Davidson (Admitted Pro Hac Vice) 

120 East Palmetto Park Road, Suite 500 

Boca Raton, FL 33432 

Telephone: 561/750-3000 

561/750-3364 (fax) 

sdavidson@rgrdlaw.com 

CASEY GERRY SCHENK FRANCAVILLA 

 BLATT & PENFIELD LLP

Gayle M. Blatt (122048) 

110 Laurel Street

San Diego, CA 92101 

Telephone: 619/238-1811 

619/544-9232 (fax) 

gmb@cglaw.com 

MILBERG TADLER PHILLIPS 

GROSSMAN LLP

Ariana J. Tadler (Admitted Pro Hac Vice) 

One Pennsylvania Plaza, 19th Floor 

New York, NY 10119 

Telephone: 212/594-5300 

212/868-1229 (fax) 

atadler@milberg.com

LOCKRIDGE GRINDAL NAUEN P.L.L.P.

Karen Hanson Riebel (Admitted Pro Hac Vice) 

100 Washington Ave. South, Suite 2200 

Minneapolis, MN 55401 

Telephone: 612/339-6900 

612/339-0981 (fax) 

khriebel@locklaw.com

Attorneys for Plaintiffs and the Class

UNITED STATES DISTRICT COURT

NORTHERN DISTRICT OF CALIFORNIA

SAN JOSE DIVISION

In re YAHOO! INC. CUSTOMER DATA 

BREACH SECURITY LITIGATION

)

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No. 16-md-02752-LHK

DECLARATION OF JOHN A. YANCHUNIS 

IN SUPPORT OF PLAINTIFFS’ MOTION 

FOR CLASS CERTIFICATION

Case 5:16-md-02752-LHK Document 258 Filed 07/16/18 Page 1 of 8
DECLARATION OF JOHN A. YANCHUNIS IN SUPPORT OF PLAINTIFFS’ MOTION FOR CLASS 

CERTIFICATION - 16-md-02752-LHK - 1 -

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I, John A. Yanchunis, declare as follows:

1. I am an attorney duly licensed to practice before all of the courts of the State of 

Florida and am admitted pro hac vice in this Court. I am a member of the law firm Morgan & 

Morgan, and serve as Chair of the Plaintiffs’ Executive Committee as appointed by this Court. I 

have personal knowledge of the matter stated herein and, if called upon, I could and would 

competently testify thereto I make this declaration pursuant to 28 USC §1746. 

2. The foregoing exhibits are being submitted in connection with Plaintiffs’ Motion 

for Class Certification:

EXHIBIT 1 Chart of Plaintiffs’ Claims and Classes

EXHIBIT 2 Verizon Stipulation at ¶¶1-3, 5-6 

EXHIBIT 3 “Response to Civil Investigative Demand,” Dec. 15, 2017 

(YMDL008625933 at -933-35, -938-41, -957-65) 

EXHIBIT 4 “Terms of Service” (YMDL009031006-257) 

EXHIBIT 5 Erin Griffith, Can Verizon Build a Strong Brand from the Bones of Yahoo 

and AOL? Wired, June 15, 2018 

EXHIBIT 6 “Privacy Policy” (YMDL009030605-872) 

EXHIBIT 7 “Security at Yahoo” webpage (YMDL009031938-975) 

EXHIBIT 8 Aabaco TOS 

EXHIBIT 9 Aabaco Privacy Policies 

EXHIBIT 10 Yahoo press release re: “An Important Message to Yahoo Users on 

Security,” Sept. 22, 2016 (YMDL008625838-839, Somaini Ex. 5) 

EXHIBIT 11 “Response to Civil Investigative Demand,” Nov. 17, 2017 

(YMDL008625903 at -903-05, -909, -917-19, -923-24) 

EXHIBIT 12 Defendants’ Responses and Objections to Plaintiffs’ Amended First Set of 

Interrogatories at 5-7, 9, 10 

EXHIBIT 13 Yahoo press release re: “Yahoo Provides Notice to Additional Users 

Affected by Previously Disclosed 2013 Data Theft,” Oct. 3, 2017 

(YMDL008625857) 

EXHIBIT 14 Yahoo press release re: “Important Security Information for Yahoo 

Users,” Dec. 14, 2016 (YMDL000041818-819, Somaini Ex. 6) 

Case 5:16-md-02752-LHK Document 258 Filed 07/16/18 Page 2 of 8
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EXHIBIT 15 Justin Somaini Deposition Transcript Excerpts, taken on May 29, 2018 (pp 

22:06-09, 24:05-18, 29:10-23, 29:24-30:09, 38:20-41:03, 50:05-14, 60:12-

64:11, 110:06-14, 121:07-123:05, 125:11-126:04, 148:15-25, 166:21-

174:07, 184:14-193:11, 198:06-204:19, 236:12-237:19, 275:04-276:16, 

280:10-281:16, 288:10-290:19) 

EXHIBIT 16 “Executive Security Briefing–Q2 2012” (YMDL000903331, Somaini Ex. 

12) 

EXHIBIT 17 “Q3 IRM All Hands,” Aug. 23, 2011; Robert Lord email re: “2011 

Maturity Assessment,” Feb. 20, 2016, with attached presentation dated 

Aug. 23, 2011 (YMDL001088370, Somaini Ex. 9) 

EXHIBIT 18 “Executive Security Briefing – Q3 2012,” Dec. 11, 2012 

(YMDL000932713, Somaini Ex. 13) 

EXHIBIT 19 “Paranoids Central Tech QOR,” May 1, 2013 (YMDL000795793) 

EXHIBIT 20 “Yahoo Overall Security Posture–Q2 2013” (YMDL008669990-0019 at -

991) 

EXHIBIT 21 Ramses Martinez Deposition Transcript Excerpts, taken on May 14-15, 

2018 (pp. 36:10-37:09, 104:25-105:15, 104:25-106:07, 108:03-109:04, 

109:09-110:09, 113:15-115:08, 127:21-128:15, 134:13-136:21, 135:16-

136:21, 138:20-139:06, 147:01-150:04, 150:05-15, 150:19-151:25, 

153:21-154:11, 167:21-168:11, 171:10-173:06, 206:22-207:25, 209:10-25, 

229:05-24, 229:25-231:05, 256:14-257:21, 610:16-612:11, 611:20-612:01) 

EXHIBIT 22 “Multi-Year Strategic Plan – Yahoo! Paranoids August 2013” 

(YMDL000385419-449 at -428, -449) 

EXHIBIT 23 “P&P Operating Review,” June 12, 2014 (YMDL001413252 at -289) 

EXHIBIT 24 Alexander Stamos Deposition Transcript Excerpts, taken on May 25, 2017

in Spain v. Mayer, Case No. 17-CV-307054 (Cal. Super. Ct., Santa Clara 

Cty.) (pp. 25:01-32:13, 36:03-37:12, 44:11-45:01, 50:04-52:25, 61:15-

62:17,74:12-75:05, 77:17-81:11, 82:17-83:12 , 89:07-91:05, 92:22-95:21, 

104:12-105:10, 105:18-108:15, 139:06-155:25, 142:14-145:04, 150:12-

152:14) 

EXHIBIT 25 Robert Lord daily notes, Feb. 5, 2016 (JCCP01184601 at -758 at -635, -

645, -659, Lord Ex. 9)

EXHIBIT 26 Email from Alexander Stamos re: “Impact List for Paranoids,” Feb. 21, 

2015 (YMDL000724526) 

EXHIBIT 27 Alexander C. Stamos Deposition Transcript Excerpts, taken on June 28, 

2018 (pp. 53:12-54:22, 64:04-20, 83:09-22, 84:18-85:11, 111:16-113:09, 

116:20-117:23, 128:19-129:20, 171:07-179:11, 254:12-262:05, 266:23-

Case 5:16-md-02752-LHK Document 258 Filed 07/16/18 Page 3 of 8
DECLARATION OF JOHN A. YANCHUNIS IN SUPPORT OF PLAINTIFFS’ MOTION FOR CLASS 

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267:16, 272:17-275:08, 278:10-282:02, 446:10-452:11), and Exs. 11 and 

12 

EXHIBIT 28 Text messages, July 14, 2016 (YMDL001184601-792 at -758, Rohlf Ex. 

58) 

EXHIBIT 29 “Response to Civil Investigative Demand,” Jan. 19, 2018 

(YMDL008625968 at -968-73, -980, -001) 

EXHIBIT 30 Marty Garvin email re: “CIO Org Risk Assessment Discussion,” Aug. 27, 

2013 (YMDL002506707-708) 

EXHIBIT 31 Email from P.P.S. Narayan re: “Alignment with Top Priorities,” Dec. 16, 

2014, with attached “Security and Privacy – Research Vision” 

presentation, Nov. 3, 2014 (YMDL007830798-047 at -802, -806) 

EXHIBIT 32 Dell SecureWorks “UDB Environment Breach Report – Project Dickens,” 

Oct. 31, 2013 (YMDL000000332-375 at -341, -343, Martinez Ex. 40) 

EXHIBIT 33 “Dubai Investigation Update,” Aug. 27, 2013 (YMDL000281950) 

EXHIBIT 34 “Response to Civil Investigative Demand,” June 22, 2018 

(YMDL009032263 at -263-65, -271) 

EXHIBIT 35 Carnegie Mellon University Software Engineering Institute, 

“Vulnerability Note VU#836068 – MD5 vulnerable to collision attacks,” 

Jan. 21, 2009 (Somaini Ex. 11) 

EXHIBIT 36 Emails between Jay Rossiter and Victoria Coleman re: “Proposal to Rotate 

User Passwords,” Apr. 9, 2014 (YMDL000247262-264) 

EXHIBIT 37 Elizabeth Zwicky email re: “Big, Hairy Problems,” Oct. 25, 2011 

(YMDL002465629, Martinez Ex. 10) 

EXHIBIT 38 Sean Zadig Deposition Transcript Excerpts, taken on November 20, 1017 

(pp. 482:03-20, 533:14-534:06, 588:15-593:09) 

EXHIBIT 39 Ramses Martinez email re: “Microsoft Report and Y! domain audit,” Feb. 

14, 2013, with attached “Microsoft Project Gordon - Technical Summary 

Notes,” “Incident Response Report,” and Jan. 13, 2012 “Security Breach 

Briefing” (YMDL001246024-114 at -036, Martinez Ex. 19) 

EXHIBIT 40 Email from John Rote re: “Post Mortem Report,” Mar. 14, 2013, with 

attached draft “Post Mortem Report” (YMDL002453059-065 at -060, 

Martinez Ex. 21) 

EXHIBIT 41 Mandiant “Threat Assessment Program (TAP) Report,” Apr. 20, 2012 

(YMDL000000523-562, Martinez Ex. 20) 

Case 5:16-md-02752-LHK Document 258 Filed 07/16/18 Page 4 of 8
DECLARATION OF JOHN A. YANCHUNIS IN SUPPORT OF PLAINTIFFS’ MOTION FOR CLASS 

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EXHIBIT 42 Email from John Rote to Ramses Martinez re: “Updated: Post Mortem,” 

May 9, 2012, with attached “Post Mortem Report” (YMDL002242331-

343 at -332, Martinez Ex. 23) 

EXHIBIT 43 “Alex - Marissa Presentation” (YMDL001407094-461 at -166) 

EXHIBIT 44 Draft “Security Update for the Yahoo! Board,” June 18, 2013 

(YMDL001317654) 

EXHIBIT 45 Ramses Martinez Deposition Transcript Excerpts, taken on May 25, 2017 

in Spain v. Mayer, Case No. 17-CV-307054 (Cal. Super. Ct., Santa Clara 

Cty.) (pp. 57:05-59:05, 57:18-59:05, 87:10-89:12, 117:14-121:09, 165:05-

24, 167:02-169:18, 171:14-19, 171:23-176:07) 

EXHIBIT 46 “Incident Update and Plan,” Feb. 9, 2015 (YMDL000788970 at p. 7-11) 

EXHIBIT 47 “Paranoid Strategy and Roadmap,” June 23, 2015 (YMDL001407361-367 

at -365) 

EXHIBIT 48 Email from Bob Lord to Paranoids leadership team re: “Justification 

Musings,” Mar. 25, 2015 (YMDL001484687, Lord Ex. 13) 

EXHIBIT 49 “2017 Strategy–Operating Plan–Science & Technology,” Nov. 11, 2016 

(YMDL000014673-712 at -677) 

EXHIBIT 50 Alexander Stamos email re: “Yahoo Server Seemingly Hacked,” Oct. 6, 

2014 (YMDL000722900-903) 

EXHIBIT 51 “IIR Team 2015 Tools and Capabilities,” Feb. 28, 2015 

(YMDL000342582-589 at -587) 

EXHIBIT 52 Christopher P. Rohlf Deposition Transcript Excerpts, taken on June 26, 

2018 (pp. 100:05-101:22, 176:16-180:09, 283:10-285:06, 367:15-25) 

EXHIBIT 53 Emails between Suzane Philion, Chris Rohlf, Ricky Connell, re: 

“Updating DROWN media statement,” Mar. 2, 2016 (YMDL001536577-

580) 

EXHIBIT 54 Robert Lord Deposition Transcript Excerpts, Vol. II taken on June 08, 

2018 (pp. 16:03-23, 29:03-30:12) 

EXHIBIT 55 Chris Rohlf email re: “Project CIE – Heads Up,” Jan. 7, 2016. 

(YMDL000195213) 

EXHIBIT 56 Text messages between Robert Lord and Chris Rohlf, Jan. 26, 2016 

(YMDL000926792, Lord. Ex. 18) 

EXHIBIT 57 Text messages, Apr. 14, 2016 (C C.ROHLF-00047-079 at -052, Rohlf Ex. 

36) 

Case 5:16-md-02752-LHK Document 258 Filed 07/16/18 Page 5 of 8
DECLARATION OF JOHN A. YANCHUNIS IN SUPPORT OF PLAINTIFFS’ MOTION FOR CLASS 

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EXHIBIT 58 “AFC Security Update,” Feb. 22, 2016 (YMDL001412367-413 at -404) 

EXHIBIT 59 “Crystal Castle,” June 2016 (YMDL001412338-343 at -341) 

EXHIBIT 60 “Project Siberia – Executive and Legal Briefing,” Nov. 21, 2014 

(YMDL001412256-268 at -258, -262, Martinez Ex. 13) 

EXHIBIT 61 “Response to Civil Investigative Demand,” Jan. 26, 2018 

(YMDL008626005-021 at -005, -008-11) 

EXHIBIT 62 “Security Update for the Board,” Oct. 5, 2016 (YMDL000955399-412 at 

-407); 

EXHIBIT 63 “Project Siberia Update: Data Exfiltration Findings,” Dec. 10, 2014 

(YMDL001407130-136 at -131, Martinez Ex. 14) 

EXHIBIT 64 Text messages, Oct. 13, 2014 (YMDL001016610) 

EXHIBIT 65 Alexander Stamos email re: “Weekly Security Update,” Nov. 4, 2014 

(YMDL000033818) 

EXHIBIT 66 Email chain between Alexander Stamos, Trish Crawley, Lisa Casson re: 

“Scheduling a Security Briefing,” Nov. 5-24, 2014 (YMDL001408182-

183) 

EXHIBIT 67 Stroz Friedberg “Yahoo! Inc. Forensic Report,” Nov. 16, 2016 

(YMDL000000418-430 at -425, -426, Zadig Ex. 23) 

EXHIBIT 68 “Yahoo! SCRC: Introduction to Presentation on Investigation,” Feb. 14, 

2017 (YMDL009030551-561 at -553, -560) 

EXHIBIT 69 Alexander Stamos email re: “Presentation – Invitation to comment,” Dec. 

10, 2012 (YMDL008935029) 

EXHIBIT 70 Alexander Stamos email re: “Marissa Discussion,” Dec. 11, 2014 

(YMDL001408723) 

EXHIBIT 71 Email chain between Sarah Meron and Anne Espiritu re: “Security issue,” 

Dec. 12, 2014 (YMDL000501364) 

EXHIBIT 72 “Siberia” (YMDL001412352) 

EXHIBIT 73 Email from Yahoo Security Team to Yahoo user re: “Important 

Information Regarding your Yahoo Mail account,” Dec. 18, 2014 

(YMDL000000241) 

EXHIBIT 74 “Minutes of a Regular Meeting of the Audit and Finance Committee of the 

Board of Directors,” Apr. 15, 2015 (YMDL001408412-421) 

Case 5:16-md-02752-LHK Document 258 Filed 07/16/18 Page 6 of 8
DECLARATION OF JOHN A. YANCHUNIS IN SUPPORT OF PLAINTIFFS’ MOTION FOR CLASS 

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EXHIBIT 75 “Security Review and 2015 Priorities” presentation, Apr. 15, 2015 

(YMDL000010430-447) 

EXHIBIT 76 “Siberia – Visual Map” charts (YMDL001126972, YMDL000010565, and 

YMDL000010566). 

EXHIBIT 77 “Minutes of a Special Meeting of the Board of Directors,” Sept. 27, 2016 

(YMDL000008093-097) 

EXHIBIT 78 Yahoo! Inc., Annual Report (Form 10-K) (Mar. 1, 2017) (relevant portions 

marked as Ex. 6) 

EXHIBIT 79 “Response to Civil Investigative Demand,” Mar. 16, 2018 

(YMDL009030574 at -574, -588-93) 

EXHIBIT 80 Paul Dugas Deposition Transcript Excerpts, taken on June 20, 2018 (pp. 

11:24-25; 21:2-9; 36:17-37:25; 61:6–23; 119:14-23; 184:25-185:6; 186:4-

9; 191:19-192:2; 313:16-314:24; 318:8-17) 

EXHIBIT 81 Hashmatullah J. Essar Deposition Transcript Excerpts, taken on July 7, 

2018 (23:19-24:11; 25:15-17; 27:1-17; 27:18-28:3; 138:7-20; 142:1–

9;142:24-145:2; 224:25-225:10) 

EXHIBIT 82 Mali Granot Deposition Transcript Excerpts, taken on June 7, 2018 (23:1-

17; 24:16-25:20; 57:10-60:6; 219:6-220:10; 257:23-258:13; 259:5-260:11) 

EXHIBIT 83 Kimberly Heines Deposition Transcript Excerpts, taken on June 29, 2018 

(pp. 21:5-12; 23:21-24:5; 27:3-28:5; 80:18-81:6; 119:21-23; 160:22-

162:1; 169:7-171:9.; 246:9-247:25; 267:11-16) 

EXHIBIT 84 Andrew J. Mortensen Deposition Transcript, taken on May 11, 2018 (pp. 

22:12-23:12; 227:20-228:7; 250:14-252:5; 252:1-255:12) 

EXHIBIT 85 Brian Neff Deposition Transcript, taken on June 12, 2018 (pp. 13:18-14:5; 

18:18-22:24; 283:8-284:2) 

EXHIBIT 86 Deana Ridolfo Deposition Transcript, taken on June 21, 2018 (pp. 18:2-

23; 94:8-95:7; 96:15-97:4; 106:11-25) 

EXHIBIT 87 Matthew Ridolfo Deposition Transcript, taken on June 20, 2018 (pp. 

23:11–24:17; 23:24-24:17; 143:21-145:25; 153:5-155:3; 158:8-19; 

208:10-209:11; 216:13-217:22) 

EXHIBIT 88 Gayle M. Blatt Biography and Casey Gerry Resume

EXHIBIT 89 Karen H Riebel Biography and Lockridge Grindal Resume 

EXHIBIT 90 Ariana J. Tadler Biography and Milberg Tadler Resume 

EXHIBIT 91 John Yanchunis Biography and Morgan and Morgan Resume 

Case 5:16-md-02752-LHK Document 258 Filed 07/16/18 Page 7 of 8
DECLARATION OF JOHN A. YANCHUNIS IN SUPPORT OF PLAINTIFFS’ MOTION FOR CLASS 

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EXHIBIT 92 Stuart A. Davidson Biography and Robbins Geller Rudman & Dowd LLP 

Resume

EXHIBIT 93 Expert Report of Mary Frantz, Enterprise Knowledge Partners, LLC 

EXHIBIT 94 Declaration of Jim Van Dyke, MBA, BS, AA 

EXHIBIT 95 Declaration of Gary M. Parilis, Ph.D. 

EXHIBIT 96 Declaration of Ian Ratner, CA, CBV, CPA/ABV, ASA, CFE 

I declare under penalty of perjury under the laws of the United States that the foregoing is 

true and correct. 

Executed this 13th day of July, 2018, at Tampa, Florida. 

 s/ John A. Yanchunis 

JOHN A. YANCHUNIS

Case 5:16-md-02752-LHK Document 258 Filed 07/16/18 Page 8 of 8