jbs.cam.ac.uk
Issued by R3
About this certificate
This digital certificate with serial number 03:1b:3d:c1:df:92:77:58:8d:e3:d8:0b:b2:0a:bb:13:fe:10 was issued on by Let's Encrypt.
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:
- DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
- Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
- Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)
Certificate Subject
CN=jbs.cam.ac.uk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:1b:3d:c1:df:92:77:58:8d:e3:d8:0b:b2:0a:bb:13:fe:10Serial Number (int): 270606571257764244656464868225812582891024
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 29:d4:cb:e8:b7:36:7b:0a:7a:3c:20:22:7b:0a:50:89:b2:84:d4:79
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): 16:7c:6a:85:2e:0d:80:c0:93:c6:49:89:f9:31:4c:b2:db:d7:26:78
Fingerprint (sha256): 01:e0:5a:3d:26:e9:bd:ca:1c:17:aa:4c:b9:96:ea:b6:36:5b:77:20:31:ba:af:47:10:ed:0e:64:32:e6:5d:ba
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.orgCheck the revocation status for certificate jbs.cam.ac.uk
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for jbs.cam.ac.uk
Public Key Algorithm
RSA
Key Size
2048
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
jbs.cam.ac.uk
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Certificate
The complete raw certificate details for jbs.cam.ac.uk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIE6DCCA9CgAwIBAgISAxs9wd+Sd1iN49gLsgq7E/4QMA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzExMTUwMjA2MjNaFw0yNDAyMTMwMjA2MjJaMBgxFjAUBgNVBAMT DWpicy5jYW0uYWMudWswggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDI ES01BINNiSkqrZUUaxLoktNGlCTem9u3dxo4NsEqAZpttD3PDtqTBndJHXURpC+c cvcf4SPBJjx5NXI1InoPqw4STb3//V4pVp8qI4Ed8aLk7OCfbUe7iCnHsuOo3Dmw e76eJgdoVIGmoy/RUixPu5EClCELjYOaCvrSvfgwEptZaBv61wKjF7udB4R5g2/2 ec22Dmh7VSk3hB90J+PsF/9GHF0G+scJLuzicv8FS5h1QgT0vzM6j75di3+cX06d u0lR2oTHqXCQVeFC52a7G/Lm6yxFfyUxS2sXB+ohGDhZqo97qkj/tgGytO+Rph6F +sI6jxuvWlj13WlJcAHHAgMBAAGjggIQMIICDDAOBgNVHQ8BAf8EBAMCBaAwHQYD VR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0O BBYEFCnUy+i3NnsKejwgInsKUImyhNR5MB8GA1UdIwQYMBaAFBQusxe3WFbLrlAJ QOYfr52LFMLGMFUGCCsGAQUFBwEBBEkwRzAhBggrBgEFBQcwAYYVaHR0cDovL3Iz Lm8ubGVuY3Iub3JnMCIGCCsGAQUFBzAChhZodHRwOi8vcjMuaS5sZW5jci5vcmcv MBgGA1UdEQQRMA+CDWpicy5jYW0uYWMudWswEwYDVR0gBAwwCjAIBgZngQwBAgEw ggEFBgorBgEEAdZ5AgQCBIH2BIHzAPEAdwBIsONr2qZHNA/lagL6nTDrHFIBy1bd LIHZu7+rOdiEcwAAAYvQ8bSlAAAEAwBIMEYCIQCzTvCOi+j/qirMKnE9ZCjrV1B4 rzpM4BlvgBeFEYDbogIhAM+rGOm45ldQaBXkKmNJulN0XVn7Zzn06ZRJqKDAryLo AHYAO1N3dT4tuYBOizBbBv5AO2fYT8P0x70ADS1yb+H61BcAAAGL0PG0rAAABAMA RzBFAiBnkb0GdryLvvwkSBLap2e1NKux3IIdWecBGVIA+ZlwkQIhAMfUavvy6jGk gKcRLScLUTlrRUcmWnS9qxhnRurpGbMVMA0GCSqGSIb3DQEBCwUAA4IBAQB22Omk j16HTrTOW4FRxcszf2qoWg2nEsdk9F5uIpnW1rzM6/94IcbMoPRIaNNpEjGR9yjb X94dXNl2VPCsyP0WmQ/mXLfYoCoZL8uuvfOswZwDv7sN3u143mJxG7pF+20FPnJp lsYhBO34jZ+QMjmaQ1Ry86EgqWpv2GEJI52tIy4uOS4r4jNSi6ighXDmjIuCygkV 6hbkhqpJ8pFJGfyjUJ7g1N+/IfZv0Y4JjequLsh/Go8GgJFd6ZLtnb2zgAst/sX+ 1gxjY+V2QsU9seK6mHj96S9D8pRy4AhLrGql4OTmlrG5MKuAvL7zX9YLfODLCO+J gU5xqhGqJLoNkfXG -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyBEtNQSDTYkpKq2VFGsS 6JLTRpQk3pvbt3caODbBKgGabbQ9zw7akwZ3SR11EaQvnHL3H+EjwSY8eTVyNSJ6 D6sOEk29//1eKVafKiOBHfGi5Ozgn21Hu4gpx7LjqNw5sHu+niYHaFSBpqMv0VIs T7uRApQhC42Dmgr60r34MBKbWWgb+tcCoxe7nQeEeYNv9nnNtg5oe1UpN4QfdCfj 7Bf/RhxdBvrHCS7s4nL/BUuYdUIE9L8zOo++XYt/nF9OnbtJUdqEx6lwkFXhQudm uxvy5ussRX8lMUtrFwfqIRg4WaqPe6pI/7YBsrTvkaYehfrCOo8br1pY9d1pSXAB xwIDAQAB -----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 270606571257764244656464868225812582891024 . . . . . . . . [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 'R3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-11-15 02:06:23 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-02-13 02:06:22 +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 'jbs.cam.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 (2160 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 25256131085541173662963476755190452549221805953658707999244009750017248251509268807365111350483324437190615213399801427507900650143851698277587806024463183325861397287060465481867009677324627544095357894934901757577811046927948789949579328750040202543315611194218468108983344339234778356844560700953205785668757799552207592718531295274075604346202850813633075455158606491130074674134560104213554171984832350637756781638090216656110077400511469605124379407007733245944422020079998169618328146675559757429035375287109256747724506135946506302823027512809832926979891212851895446217497544640160933639326999086834157355463 . . . . . . . . . . . . . . . . . . . . [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) 29d4cbe8b7367b0a7a3c20227b0a5089b284d479 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (17 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'jbs.cam.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 (12 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 1.3.6.1.4.1.11129.2.4.2 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (246 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes) 00f100770048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018bd0f1b4a50000040300483046022100b34ef08e8be8ffaa2acc2a713d6428eb575078af3a4ce0196f8017851180dba2022100cfab18e9b8e657506815e42a6349ba53745d59fb6739f4e99449a8a0c0af22e80076003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018bd0f1b4ac000004030047304502206791bd0676bc8bbefc244812daa767b534abb1dc821d59e701195200f9997091022100c7d46afbf2ea31a480a7112d270b51396b4547265a74bdab186746eae919b315 . . . . [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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