csgs.kcl.ac.uk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:43:2e:03:45:ce:ba:03:ce:1b:d4:c7:0b:7a:ec:3b:c8:eb was issued on by Let's Encrypt.
With 2 subject alternative names this certificate can be used to secure multiple fqdn's. This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.
We have idenified some issues with this certificate:
- Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)
Certificate Subject
CN=csgs.kcl.ac.uk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:43:2e:03:45:ce:ba:03:ce:1b:d4:c7:0b:7a:ec:3b:c8:ebSerial Number (int): 284196937859545131668383089542305121290475
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: f8:8c:10:bb:1f:03:f3:93:09:d7:e2:36:90:8e:e7:83:5c:07:36:47
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): cd:ba:72:d4:9e:ef:2d:2c:ee:46:03:1f:11:7f:9b:2c:21:53:63:0b
Fingerprint (sha256): 0a:02:0e:0c:db:b3:6d:2d:2f:85:a1:19:bf:46:6b:96:5e:dd:b6:9d:08:bb:7f:e9:e6:4b:d5:36:62:1d:c8:09
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate csgs.kcl.ac.uk
2
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for csgs.kcl.ac.uk
Public Key Algorithm
RSA
Key Size
4096
Signature Algorithm
SHA256 with RSA
Key Usage
Digital Signature
Key Encipherment
Extended Key Usages
Server Authentication
Client Authentication
Extensions
9 extensions
No
unhandled critical extensions
CA Certificate
This is not a CA certificate
Subject Alternative Names
csgs.kcl.ac.uk
www.csgs.kcl.ac.uk
www.csgs.kcl.ac.uk
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Certificate
The complete raw certificate details for csgs.kcl.ac.uk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGaDCCBVCgAwIBAgISA0MuA0XOugPOG9THC3rsO8jrMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA4MTEwMzMwMTBaFw0x OTExMDkwMzMwMTBaMBkxFzAVBgNVBAMTDmNzZ3Mua2NsLmFjLnVrMIICIjANBgkq hkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA8VdAP0G9fa61Hv2sEA4BaeB7tQ8SZ6hj fYCqN86DOmgVmF2rwm+ZYUdeqg1rrn3m6qKDyeyi+ySAKyArxtpsd8jEZ2ckcS8p MhkO/LULehQwc2t8jUgl+8Yp/CiLXSkJy9xFtsMIMkN4UiFT5svEOTyAdvQohhsE /3FghaBwUbhU9qIn6zOKX1NP/e6EkcDX6TQWjJ2bqw8R+aMMBV8spYtEorzWFrZc LSQYo/C9vGUHjUr+WT7mahvlTFXqJuKhRbR7/KS2khqUBGpnr62DOdNw/YiraZnn rYb9YZpDNyLoqVM2TOzlzCrNdutnqqbztAl8otlikvhg+WKTVb1RqmX+r7yUhjtH Qg3LsL2KQxJR476ly9CSJu8O8M8TRC7IA0Bsr7HNRUknYeMGKeMGtqqvZ/5JrswK x0KuKrJLlfUjflzFjzTjIhWbo4RUR9Lz4mOGXnsblyBya+caexRRBLwOICDcpdiq 1Ubur1nB6zR5sc/35pyILg+Sjuh9vWkt3wmsKpd4ENrH0P6yMPEoJSfdGO+WUTZP d25PQrScgHCZUGbdyyKVkZqTKGS7ijiICJWsGQfDPy8fFRkoD0e1tDXfleLq0PFT VAlGg4nX4TESvRmF9yqSkGPJvETii/wTxMv6uy14ggpIBtMj9YipdoqiLIUNgjkP pb7aLDbC68MCAwEAAaOCAncwggJzMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAU BggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQU+IwQ ux8D85MJ1+I2kI7ng1wHNkcwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo 7KEwbwYIKwYBBQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQt eDMubGV0c2VuY3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQt eDMubGV0c2VuY3J5cHQub3JnLzAtBgNVHREEJjAkgg5jc2dzLmtjbC5hYy51a4IS d3d3LmNzZ3Mua2NsLmFjLnVrMEwGA1UdIARFMEMwCAYGZ4EMAQIBMDcGCysGAQQB gt8TAQEBMCgwJgYIKwYBBQUHAgEWGmh0dHA6Ly9jcHMubGV0c2VuY3J5cHQub3Jn MIIBBAYKKwYBBAHWeQIEAgSB9QSB8gDwAHYAdH7agzGtMxCRIZzOJU9CcMK//V5C IAjGNzV55hB7zFYAAAFsfvDevgAABAMARzBFAiEA+yYVkjOemHKsX6S8DNOG4xt6 OZ1EJ2FiLO5/taNmvdwCIC0+n0EaNtxkvy/CfjAJIh3SuN0nahaGM5GsZZYZPaNo AHYAKTxRllTIOWW6qlD8WAfUt2+/WHopctykwwz05UVH9HgAAAFsfvDgrQAABAMA RzBFAiEA2jVSq2iM2pyHdEtUnOdZsvldcwDjgh1K5vL7nHG4O6kCICVW0ecv7sXr oF1wAeyK3jlFP4Gi53T6C3BjqMkicLFZMA0GCSqGSIb3DQEBCwUAA4IBAQAISHd9 5eSjE+6tRDpxOL9g4LwBsqM+TA/kGy6ytNHhm5Ov1+KL+msPEjg6xbBFm33FZq6R 5vt2SyqofQjhm9HaBE3+y7ZWNmWvHV/w7H1XRgsUOv+/twykpjm6/yeBSrf1Va0+ kkfKjSLaXxXgcLPVb3Br06oOLI86MEKoUnVQYqBbXzFtr9PhX1eqp3Sr3A2Ll5Ho g0lhTmQaijnLiAIu6FdLc+NlTzJTJzn17VskTOCOuSTOyNaeqX70SFXGYXs2Nbi+ +zXg3E8eeKLkWBL9eJgZvul/YOk71wUNz+OSc/mMu77gNZWBqx7bJLN/qrX4OD/M KXnjYi30q76O2mow -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA8VdAP0G9fa61Hv2sEA4B aeB7tQ8SZ6hjfYCqN86DOmgVmF2rwm+ZYUdeqg1rrn3m6qKDyeyi+ySAKyArxtps d8jEZ2ckcS8pMhkO/LULehQwc2t8jUgl+8Yp/CiLXSkJy9xFtsMIMkN4UiFT5svE OTyAdvQohhsE/3FghaBwUbhU9qIn6zOKX1NP/e6EkcDX6TQWjJ2bqw8R+aMMBV8s pYtEorzWFrZcLSQYo/C9vGUHjUr+WT7mahvlTFXqJuKhRbR7/KS2khqUBGpnr62D OdNw/YiraZnnrYb9YZpDNyLoqVM2TOzlzCrNdutnqqbztAl8otlikvhg+WKTVb1R qmX+r7yUhjtHQg3LsL2KQxJR476ly9CSJu8O8M8TRC7IA0Bsr7HNRUknYeMGKeMG tqqvZ/5JrswKx0KuKrJLlfUjflzFjzTjIhWbo4RUR9Lz4mOGXnsblyBya+caexRR BLwOICDcpdiq1Ubur1nB6zR5sc/35pyILg+Sjuh9vWkt3wmsKpd4ENrH0P6yMPEo JSfdGO+WUTZPd25PQrScgHCZUGbdyyKVkZqTKGS7ijiICJWsGQfDPy8fFRkoD0e1 tDXfleLq0PFTVAlGg4nX4TESvRmF9yqSkGPJvETii/wTxMv6uy14ggpIBtMj9Yip doqiLIUNgjkPpb7aLDbC68MCAwEAAQ== -----END PUBLIC KEY-----
ASN.1 decoded
[c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2 . . . . . . . . [c:0|t:2|false] INTEGER 284196937859545131668383089542305121290475 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6 (countryName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10 (organizationName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt Authority X3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-08-11 03:30:10 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-11-09 03:30:10 +0000 UTC . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'csgs.kcl.ac.uk' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1 (rsaEncryption) . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (4208 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 984584661340887718465642836306168432862216616228011949815646528024202256191973154206882673450933062790947623747520140743464698473563656789319672420361040746651816126889711440084558002006399132844933661654154044820262781027388450553032929956151367903994002087884303933946498330513853818401978577173167126512985272631120647303930380390877228909553719855380914860089286524282561342772358811771998177101579431159905540554554349777742804912821556931826687612092958527077132188869564199299651377258896833090556567367125377372514044856038053646004734520767555047516451993634608863628072424216389095548303146990488097483758254585812696663096968856837306314510676109062515784195194497226130694839455306314411322312101473736525264678197129054147766084631570489804871894495259181964400209980290368624730212839046827129056607694287623501523333172210274482139517938495202405345976084894955444878719929614214975111219824422163178874421094002173221720101532119652985648472890972820490898510504182211555627768590828843750639054964028172427712192984698095607549926978480935653059351324482669307340506154831228502961865479688705618165628477835936376150616498465720485508956406628790145968310545853561704632068013676953639279196063522294182201161608131 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537 . . . . . . . . [c:2|t:3|true] ORAddress . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15 (keyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits) 05a0 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37 (extKeyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1 (serverAuth) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.14 (subjectKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes) f88c10bb1f03f39309d7e236908ee7835c073647 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName a84a6a63047dddbae6d139b7a64565eff3a8eca1 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (99 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://ocsp.int-x3.letsencrypt.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://cert.int-x3.letsencrypt.org/' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (38 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'csgs.kcl.ac.uk' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.csgs.kcl.ac.uk' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (69 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1 (Domain Validation Certificates Policy) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.44947.1.1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes) 00f0007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016c7ef0debe0000040300473045022100fb261592339e9872ac5fa4bc0cd386e31b7a399d442761622cee7fb5a366bddc02202d3e9f411a36dc64bf2fc27e3009221dd2b8dd276a16863391ac6596193da368007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016c7ef0e0ad0000040300473045022100da3552ab688cda9c87744b549ce759b2f95d7300e3821d4ae6f2fb9c71b83ba902202556d1e72feec5eba05d7001ec8ade39453f81a2e774fa0b7063a8c92270b159 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 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