libcal.kcl.ac.uk

Issued by R3

About this certificate

This digital certificate with serial number 04:d9:39:28:92:09:24:f5:e8:f0:81:71:6f:d6:15:4b:38:dd 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=libcal.kcl.ac.uk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:d9:39:28:92:09:24:f5:e8:f0:81:71:6f:d6:15:4b:38:dd
Serial Number (int): 422366393998475009098885750949092491213021
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: de:ee:82:80:47:86:cc:be:d9:df:67:0e:3f:ef:b0:78:12:6e:bf:f3
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): e2:ba:06:14:d7:c7:74:ea:8b:50:7f:3d:bb:a9:63:54:0a:bc:db:d8
Fingerprint (sha256): 0a:85:0a:2d:de:b9:47:67:0b:e3:91:c5:51:ba:f2:02:35:a0:24:4b:98:cd:13:bc:bc:ea:ea:f4:ed:d0:f6:95

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate libcal.kcl.ac.uk

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for libcal.kcl.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

libcal.kcl.ac.uk

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Certificate

The complete raw certificate details for libcal.kcl.ac.uk in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAhXg68qInM2kjUiT9jXZc
CNlhmV2AylHIOd9rCywEo0zXnQVPX6dGJ2exFM6OrlDhFoWhUutT5u0T7jvYPyOk
BkJQk1eVVOgVDGEBHxB5M6ePQfiHcoMZLwxw2OamRou5h9lMMWpPQsEqijg0AsBp
7UTOOINR8+PFm/1pZMSBnz1ipCSF922fGtcKWsv4qhEXq9rXCIqixbAgZ3qf5EAT
KVo15iyDpR/X53/Y7+9KQde+FVj646zUEdqoWUSb/5aqQHtdmAz5U6vYgFTPDspD
ilLttFcYAYp/etXwOZx5BPIjTxXWIbL0DYeCt1eL12I4aFP3Xuda6P7O5u8k7TAi
JQIDAQAB
-----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 422366393998475009098885750949092491213021
 . . . . . . . . [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 2024-02-03 12:08:53 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-05-03 12:08:52 +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 'libcal.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 16848982313739572576907747650544632034136299634076909062836254194953037038430117337234404445696959701591543661142852592328054158858578804490756323822787410782227538699945576069726347135386885986524307791576257701332371586888646891646690258189702779111442365102715151934375481042971686214359576368128372399337586980948317250706343881247227692749383870734146962321706961795398016746714161607785868696804280563970502612029287466431217585844991291478073985163099148220741956756156641330097909172141981377282843850044320218719498626850693684220440910146071280810316546048078469577943485952722303628270412845996839567106597
 . . . . . . . . . . . . . . . . . . . . [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)
							deee82804786ccbed9df670e3fefb078126ebff3
 . . . . . . . . . . . . . . . . [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 (20 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'libcal.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 (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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f000760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018d6f1611320000040300473045022006e0d272bb224692e2f170024d002a08f28eee6ede5fea5d37b1bd399ddbd46e022100fdbbdd95077c95c7d4dc7de19272369a95f2600f853c1781caabb20f4b7d2ea00076003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018d6f16114100000403004730450221008403fdd3ed523dc06c3c051d057bcf38898ab56b47bba796e5e97a140cb7d881022027d17f22685b7f46d0a1033e97a01ca23c64f32c12e400d26e36a5a4cb31a2d2
 . . . . [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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