Report Description

This report, much like our original certs and CAs report, focuses on issuers of SSL enabling certificates found on web servers. Unlike our original report, however, this report has a couple of key differences to it:

• Reports on top 100 CAs. The original report only paid attention to the major CAs at the time the report was produced. This report lists the top 100 CAs for the month. You will find here many self-signing organizations such as universities, telecommunications firms, etc.
• Uses issuer name as identifier. Our original report only counted a certificate towards an organization if we were able to prove, by virtue of verifying the key, that the organization in question actually signed the certificate. This had a notable problem with it - we don't always have the public key of the CA. In at least one case, a CA doesn't make their public key available unless you sign a license agreement.

  This report doesn't have that problem, since it only uses the issuer Organization Name to uniquely identify the issuing CA.

CA	May 2011 Count	May 2011 %	April 2011 Count	April 2011 %	Growth %
GoDaddy.com, Inc.	141,371	16.90	137,502	16.72	1.12
Equifax (Geotrust)	123,486	14.77	128,545	15.63	-5.52
Verisign	88,993	10.64	88,760	10.79	-1.39
Comodo Limited	48,154	5.76	49,374	6.00	-4.08
GeoTrust, Inc.	41,339	4.94	35,974	4.37	13.02
Thawte, Inc.	34,469	4.12	31,582	3.84	7.34
Thawte	32,883	3.93	35,591	4.33	-9.13
DigiCert	30,889	3.69	29,946	3.64	1.45
GeoTrust Inc.	24,468	2.93	21,935	2.67	9.71
COMODO CA Limited	22,529	2.69	20,660	2.51	7.25
Unknown	20,947	2.50	20,607	2.51	-0.03
Comodo CA Limited	19,846	2.37	19,224	2.34	1.53
Network Solutions L.L.C.	18,620	2.23	18,304	2.23	0.05
GlobalSign nv-sa	16,294	1.95	15,942	1.94	0.52
Starfield Technologies, Inc.	15,360	1.84	15,011	1.83	0.64
GlobalSign	15,314	1.83	15,036	1.83	0.17
Entrust, Inc.	10,768	1.29	10,598	1.29	-0.07
TERENA	6,953	0.83	6,692	0.81	2.19
SecureTrust Corporation	6,811	0.81	6,756	0.82	-0.85
Alpha	5,910	0.71	5,638	0.69	3.10
StartCom Ltd.	4,828	0.58	4,439	0.54	6.97
SomeOrganization	4,650	0.56	4,608	0.56	-0.75
Parallels	3,818	0.46	3,754	0.46	0.03
Akamai Technologies Inc	3,538	0.42	3,244	0.39	7.26
Cybertrust Japan Co., Ltd.	2,674	0.32	2,537	0.31	3.66
SECOM Trust Systems CO.,LTD.	2,599	0.31	2,587	0.31	-1.19
SWsoft, Inc.	2,328	0.28	2,341	0.28	-2.20
thawte, Inc.	1,905	0.23	1,852	0.23	1.17
Root CA	1,899	0.23	1,905	0.23	-1.96
GeoTrust Inc	1,846	0.22	1,686	0.20	7.68
Sun Microsystems Inc	1,844	0.22	1,843	0.22	-1.60
CAcert Inc.	1,800	0.22	1,763	0.21	0.42
Servision Inc.	1,693	0.20	1,681	0.20	-0.95
Unizeto Technologies S.A.	1,630	0.19	1,579	0.19	1.53
U.S. Government	1,325	0.16	1,344	0.16	-3.04
Cybertrust	1,276	0.15	1,360	0.17	-7.72
TC TrustCenter GmbH	1,249	0.15	1,266	0.15	-2.97
SECOM Trust.net	1,214	0.15	1,255	0.15	-4.86
Google Inc	1,173	0.14	1,125	0.14	2.55
Betrusted Japan Co., Ltd.	1,167	0.14	1,274	0.15	-9.91
Snake Oil, Ltd	1,063	0.13	1,088	0.13	-3.91
Internet2	1,011	0.12	710	0.09	40.05
Register.com	1,009	0.12	989	0.12	0.34
ips Certification Authority	999	0.12	993	0.12	-1.05
Cybertrust Inc	984	0.12	950	0.12	1.87
ispgateway	951	0.11	929	0.11	0.68
Secure Business Services, Inc.	906	0.11	956	0.12	-6.79
GTE Corporation	902	0.11	871	0.11	1.85
UIC	892	0.11	888	0.11	-1.21
QuoVadis Limited	886	0.11	868	0.11	0.39
Trusted Secure Certificate Authority	853	0.10	817	0.10	2.68
none	714	0.09	715	0.09	-1.79
GANDI SAS	693	0.08	661	0.08	3.11
AusCERT	545	0.07	508	0.06	5.51
T-Systems Enterprise Services GmbH	527	0.06	582	0.07	-10.94
NetLock Halozatbiztonsagi Kft.	513	0.06	517	0.06	-2.41
National Institute of Informatics	509	0.06	498	0.06	0.52
EUNETIC GmbH	481	0.06	470	0.06	0.65
Firstserver, Inc	437	0.05	439	0.05	-2.10
Parallels, Inc.	436	0.05	413	0.05	3.83
Government of Korea	429	0.05	403	0.05	4.70
OVH SAS	410	0.05	384	0.05	5.01
Autistici/Inventati	382	0.05	267	0.03	40.71
Entrust.net	363	0.04	405	0.05	-11.85
OCC	361	0.04	354	0.04	0.30
Globe Hosting, Inc.	346	0.04	321	0.04	6.01
WTF ALFA	344	0.04	340	0.04	-0.49
TBS INTERNET	341	0.04	336	0.04	-0.19
Apache HTTP Server	341	0.04	341	0.04	-1.65
Sonera	333	0.04	324	0.04	1.08
FNMT	328	0.04	321	0.04	0.50
Internet Widgits Pty Ltd	326	0.04	311	0.04	3.09
ICP-Brasil	314	0.04	302	0.04	2.26
T-Systems International GmbH	282	0.03	221	0.03	25.50
SYS-CON Media	273	0.03	256	0.03	4.88
TAIWAN-CA.COM Inc.	265	0.03	286	0.03	-8.87
RBC Hosting Center	262	0.03	246	0.03	4.75
Zimbra Collaboration Suite	253	0.03	246	0.03	1.15
TDC	241	0.03	242	0.03	-2.06
SonicWALL, Inc.	240	0.03	240	0.03	-1.65
WebSpace-Forum, Thomas Wendt	236	0.03	235	0.03	-1.23
XX	224	0.03	198	0.02	11.27
OptimumSSL CA	203	0.02	200	0.02	-0.17
Getronics PinkRoccade Nederland B.V.	198	0.02	193	0.02	0.90
Digi-Sign Limited	184	0.02	184	0.02	-1.65
IPS Certification Authority s.l.	181	0.02	176	0.02	1.15
SiteGround LLC.	173	0.02	179	0.02	-4.95
InterWorx	168	0.02	171	0.02	-3.37
WoSign, Inc.	166	0.02	159	0.02	2.68
My Company Ltd	160	0.02	151	0.02	4.21
America Online Inc.	154	0.02	157	0.02	-3.53
TAIWAN-CA INC.	152	0.02	130	0.02	15.00
Ministere education nationale (MENESR)	149	0.02	147	0.02	-0.31
Positive Software	143	0.02	148	0.02	-4.97
Universitaet Heidelberg	141	0.02	138	0.02	0.49
New Dream Network, LLC.	139	0.02	139	0.02	-1.65
CrossTrust	139	0.02	0	0.00	N/A
TNC	138	0.02	130	0.02	4.40
HTTPS Management Certificate for SonicWALL (self-signed)	138	0.02	137	0.02	-0.93
XRamp Security Services Inc	136	0.02	136	0.02	-1.65

Note: Readers are cautioned that the Growth percentages are based on a CA's market share penetration rather than the absolute number of certificates we detected. Thus, it is possible for the number of certificates to increase, while the growth is actually a negative value.