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	April 2006 Count	April 2006 %	March 2006 Count	March 2006 %	Growth %
Verisign	74,372	28.83	73,881	29.25	-1.45
Equifax (Geotrust)	51,068	19.79	49,390	19.56	1.22
Thawte	38,682	14.99	38,410	15.21	-1.41
Comodo Limited	18,771	7.28	19,286	7.64	-4.72
Starfield Technologies, Inc.	7,603	2.95	6,968	2.76	6.82
Unknown	4,896	1.90	4,663	1.85	2.79
AddTrust AB	4,717	1.83	3,811	1.51	21.17
Entrust.net	4,201	1.63	4,075	1.61	0.93
SomeOrganization	3,078	1.19	3,091	1.22	-2.51
SWsoft, Inc.	2,225	0.86	2,159	0.85	0.89
ChainedSSL	2,210	0.86	2,177	0.86	-0.62
Snake Oil, Ltd	2,013	0.78	2,001	0.79	-1.51
The USERTRUST Network	1,766	0.68	1,747	0.69	-1.04
DigiCert Inc.	1,753	0.68	1,265	0.50	35.66
XRamp Security Services Inc	1,515	0.59	1,471	0.58	0.83
U.S. Government	1,463	0.57	1,462	0.58	-2.03
Network Solutions L.L.C.	1,326	0.51	1,108	0.44	17.16
TC TrustCenter for Security in Data Networks GmbH	815	0.32	805	0.32	-0.89
IPS Certification Authority s.l.	796	0.31	767	0.30	1.60
GlobalSign nv-sa	673	0.26	657	0.26	0.28
Root CA	658	0.26	640	0.25	0.65
Betrusted Japan Co.,Ltd.	436	0.17	416	0.16	2.60
Positive Software Corporation	334	0.13	278	0.11	17.62
ispgateway	274	0.11	256	0.10	4.78
FreeSSL	272	0.11	288	0.11	-7.54
Deutsche Telekom AG	242	0.09	273	0.11	-13.22
GTE Corporation	226	0.09	223	0.09	-0.78
Plesk, Inc.	219	0.08	227	0.09	-5.55
Comodo Japan Inc.	199	0.08	181	0.07	7.63
Akamai	182	0.07	177	0.07	0.66
TDC	173	0.07	176	0.07	-3.77
Kubota Systems Inc.	169	0.07	167	0.07	-0.93
Ipswitch,Inc.	161	0.06	159	0.06	-0.87
Apache HTTP Server	151	0.06	144	0.06	2.66
Positive Software	142	0.06	131	0.05	6.12
OCC	123	0.05	111	0.04	8.48
Plesk Inc.	120	0.05	120	0.05	-2.10
Firstserver, Inc.	120	0.05	106	0.04	10.83
NetLock Halozatbiztonsagi Kft.	112	0.04	110	0.04	-0.32
Internet Widgits Pty Ltd	105	0.04	111	0.04	-7.39
Unizeto Sp. z o.o.	103	0.04	105	0.04	-3.97
ICS_TREE	95	0.04	90	0.04	3.34
RM	89	0.03	84	0.03	3.73
GlobalSign Inc	89	0.03	91	0.04	-4.25
CRU	89	0.03	87	0.03	0.15
Digital Signature Trust Co.	88	0.03	89	0.04	-3.20
Trusted Secure Certificate Authority	87	0.03	84	0.03	1.39
IceWarp Software	86	0.03	84	0.03	0.23
Thawte Certification	84	0.03	87	0.03	-5.48
StartCom Ltd.	81	0.03	74	0.03	7.16
CNRS	80	0.03	78	0.03	0.41
NTT Communications Corporation	77	0.03	75	0.03	0.51
ICP-Brasil	70	0.03	69	0.03	-0.68
CAcert Inc.	69	0.03	61	0.02	10.74
XYZ Corporation	65	0.03	65	0.03	-2.10
T-Systems Enterprise Services GmbH	62	0.02	39	0.02	55.63
United Network Communications Co., Ltd.	59	0.02	59	0.02	-2.10
MULTICERT-CA	59	0.02	57	0.02	1.33
Japan Certification Services, Inc.	59	0.02	60	0.02	-3.73
BlueHost.Com	59	0.02	55	0.02	5.02
Equifax Secure Inc	58	0.02	57	0.02	-0.38
Digi-Sign Limited	58	0.02	45	0.02	26.18
Your Name Webhosting	56	0.02	51	0.02	7.50
Stunnel Developers Ltd	55	0.02	57	0.02	-5.54
FNMT	53	0.02	54	0.02	-3.91
WebMoney Transfer	52	0.02	51	0.02	-0.18
TAIWAN-CA.COM	51	0.02	44	0.02	13.47
Sun Microsystems Inc	47	0.02	43	0.02	7.01
Temp Certificate!	46	0.02	43	0.02	4.73
Hostgator	44	0.02	39	0.02	10.45
Default Web Site	43	0.02	37	0.01	13.77
My Company Ltd	42	0.02	44	0.02	-6.55
University of Maryland	41	0.02	41	0.02	-2.10
S1 Corporation	41	0.02	40	0.02	0.35
UniCERT Brasil Certificadora	40	0.02	43	0.02	-8.93
SCNC	40	0.02	40	0.02	-2.10
Stalker Software, Inc.	39	0.02	35	0.01	9.09
DFN-CERT Services GmbH	39	0.02	41	0.02	-6.88
Carnegie Mellon University	39	0.02	38	0.02	0.47
SuSE Linux Web Server	36	0.01	38	0.02	-7.25
Sonera	36	0.01	32	0.01	10.14
A-Trust Ges. f. Sicherheitssysteme im elektr. Datenverkehr GmbH	35	0.01	35	0.01	-2.10
University of Washington	34	0.01	33	0.01	0.86
Secure Business Services, Inc.	33	0.01	0	0.00	N/A
IceWarp Ltd.	33	0.01	32	0.01	0.96
CFC	33	0.01	32	0.01	0.96
Beocity	33	0.01	35	0.01	-7.70
University of Helsinki	32	0.01	31	0.01	1.06
IT Bureau of Hainan Province	32	0.01	29	0.01	8.03
Etisalat	32	0.01	35	0.01	-10.49
Audkenni hf.	31	0.01	29	0.01	4.65
cv. Candi Internet	30	0.01	31	0.01	-5.26
WEBMASTERS.COM	30	0.01	30	0.01	-2.10
Cisco Systems, Inc.	30	0.01	0	0.00	N/A
Prvni certifikacni autorita a.s.	29	0.01	28	0.01	1.39
Massachusetts Institute of Technology	29	0.01	29	0.01	-2.10
E-Telbank Sp. z o.o.	29	0.01	0	0.00	N/A
CETI	29	0.01	29	0.01	-2.10
Advanced Extranet Server	29	0.01	29	0.01	-2.10
Webmin Software	28	0.01	30	0.01	-8.63

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.