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 2006 Count	May 2006 %	April 2006 Count	April 2006 %	Growth %
Verisign	74,979	28.51	74,372	28.83	-1.10
Equifax (Geotrust)	52,562	19.99	51,068	19.79	0.97
Thawte	39,228	14.92	38,682	14.99	-0.52
Comodo Limited	18,983	7.22	18,771	7.28	-0.80
Starfield Technologies, Inc.	8,121	3.09	7,603	2.95	4.78
Unknown	5,137	1.95	4,896	1.90	2.93
AddTrust AB	4,875	1.85	4,717	1.83	1.38
Entrust.net	4,285	1.63	4,201	1.63	0.06
SomeOrganization	3,144	1.20	3,078	1.19	0.20
SWsoft, Inc.	2,296	0.87	2,225	0.86	1.23
ChainedSSL	2,282	0.87	2,210	0.86	1.29
Snake Oil, Ltd	2,012	0.77	2,013	0.78	-1.95
The USERTRUST Network	1,982	0.75	1,766	0.68	10.09
XRamp Security Services Inc	1,548	0.59	1,515	0.59	0.23
U.S. Government	1,482	0.56	1,463	0.57	-0.63
Network Solutions L.L.C.	1,435	0.55	1,326	0.51	6.16
DigiCert Inc.	1,381	0.53	1,753	0.68	-22.72
TC TrustCenter for Security in Data Networks GmbH	830	0.32	815	0.32	-0.10
IPS Certification Authority s.l.	805	0.31	796	0.31	-0.79
Root CA	702	0.27	658	0.26	4.66
GlobalSign nv-sa	699	0.27	673	0.26	1.89
Betrusted Japan Co.,Ltd.	459	0.17	436	0.17	3.27
Positive Software Corporation	374	0.14	334	0.13	9.84
ispgateway	280	0.11	274	0.11	0.24
FreeSSL	275	0.10	272	0.11	-0.82
Deutsche Telekom AG	238	0.09	242	0.09	-3.52
GTE Corporation	231	0.09	226	0.09	0.27
Plesk, Inc.	220	0.08	219	0.08	-1.46
Comodo Japan Inc.	213	0.08	199	0.08	5.00
Akamai	185	0.07	182	0.07	-0.29
Kubota Systems Inc.	177	0.07	169	0.07	2.74
TDC	173	0.07	173	0.07	-1.90
Ipswitch,Inc.	159	0.06	161	0.06	-3.12
Apache HTTP Server	152	0.06	151	0.06	-1.25
Positive Software	131	0.05	142	0.06	-9.50
OCC	129	0.05	123	0.05	2.88
Firstserver, Inc.	126	0.05	120	0.05	3.00
Plesk Inc.	117	0.04	120	0.05	-4.36
NetLock Halozatbiztonsagi Kft.	114	0.04	112	0.04	-0.15
Internet Widgits Pty Ltd	106	0.04	105	0.04	-0.97
Unizeto Sp. z o.o.	105	0.04	103	0.04	0.00
Trusted Secure Certificate Authority	93	0.04	87	0.03	4.86
Thawte Certification	93	0.04	84	0.03	8.61
ICS_TREE	93	0.04	95	0.04	-3.97
Digital Signature Trust Co.	92	0.03	88	0.03	2.56
CRU	92	0.03	89	0.03	1.40
RM	91	0.03	89	0.03	0.30
GlobalSign Inc	91	0.03	89	0.03	0.30
IceWarp Software	88	0.03	86	0.03	0.38
StartCom Ltd.	84	0.03	81	0.03	1.73
NTT Communications Corporation	81	0.03	77	0.03	3.19
CNRS	81	0.03	80	0.03	-0.68
CAcert Inc.	80	0.03	69	0.03	13.74
ICP-Brasil	70	0.03	70	0.03	-1.90
T-Systems Enterprise Services GmbH	69	0.03	62	0.02	9.17
Digi-Sign Limited	68	0.03	58	0.02	15.01
XYZ Corporation	65	0.02	65	0.03	-1.90
Your Name Webhosting	63	0.02	56	0.02	10.36
BlueHost.Com	62	0.02	59	0.02	3.08
MULTICERT-CA	61	0.02	59	0.02	1.42
United Network Communications Co., Ltd.	59	0.02	59	0.02	-1.90
Japan Certification Services, Inc.	59	0.02	59	0.02	-1.90
TAIWAN-CA.COM	56	0.02	51	0.02	7.71
Equifax Secure Inc	56	0.02	58	0.02	-5.29
WebMoney Transfer	54	0.02	52	0.02	1.87
Stunnel Developers Ltd	54	0.02	55	0.02	-3.69
FNMT	53	0.02	53	0.02	-1.90
Sun Microsystems Inc	49	0.02	47	0.02	2.27
Default Web Site	49	0.02	43	0.02	11.78
Secure Business Services, Inc.	47	0.02	33	0.01	39.71
Temp Certificate!	45	0.02	46	0.02	-4.04
Hostgator	44	0.02	44	0.02	-1.90
My Company Ltd	42	0.02	42	0.02	-1.90
UniCERT Brasil Certificadora	41	0.02	40	0.02	0.55
S1 Corporation	41	0.02	41	0.02	-1.90
Carnegie Mellon University	41	0.02	39	0.02	3.13
University of Maryland	40	0.02	41	0.02	-4.30
SCNC	40	0.02	40	0.02	-1.90
DFN-CERT Services GmbH	40	0.02	39	0.02	0.61
SuSE Linux Web Server	38	0.01	36	0.01	3.55
Stalker Software, Inc.	36	0.01	39	0.02	-9.45
A-Trust Ges. f. Sicherheitssysteme im elektr. Datenverkehr GmbH	36	0.01	35	0.01	0.90
Sonera	35	0.01	36	0.01	-4.63
Beocity	35	0.01	33	0.01	4.04
University of Washington	34	0.01	34	0.01	-1.90
IceWarp Ltd.	34	0.01	33	0.01	1.07
IT Bureau of Hainan Province	33	0.01	32	0.01	1.16
Etisalat	33	0.01	32	0.01	1.16
CsideNet	33	0.01	0	0.00	N/A
CFC	33	0.01	33	0.01	-1.90
Audkenni hf.	33	0.01	31	0.01	4.43
University of Helsinki	32	0.01	32	0.01	-1.90
E-Telbank Sp. z o.o.	32	0.01	29	0.01	8.24
WEBMASTERS.COM	31	0.01	30	0.01	1.37
Prvni certifikacni autorita a.s.	31	0.01	29	0.01	4.86
HostGator	31	0.01	0	0.00	N/A
Cisco Systems, Inc.	31	0.01	30	0.01	1.37
cv. Candi Internet	30	0.01	30	0.01	-1.90
Advanced Extranet Server	30	0.01	29	0.01	1.48
"PositiveSoftwareCorporation"	30	0.01	0	0.00	N/A

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.