data.greymatterlearning.co.uk

Issued by R3

About this certificate

This digital certificate with serial number 04:af:60:3d:9f:5c:5d:ee:4f:8f:a8:ef:0a:3f:86:4f:68:3a 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=data.greymatterlearning.co.uk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:af:60:3d:9f:5c:5d:ee:4f:8f:a8:ef:0a:3f:86:4f:68:3a
Serial Number (int): 408126483788130128378773639496935259727930
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 77:a0:d5:50:f3:a4:2f:c2:57:8f:ae:aa:fa:23:4d:ad:27:6c:d0:66
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 16:c1:50:94:9f:7c:fd:0e:ad:a9:bc:f4:52:45:7b:a0:a9:fb:6d:12
Fingerprint (sha256): fb:8d:28:69:dc:fd:7f:c5:e4:38:7d:ef:15:28:3d:31:76:48:3e:5e:3e:20:ce:8d:c5:a9:d8:25:a7:ae:23:8a

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

Revocation information

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

Check the revocation status for certificate data.greymatterlearning.co.uk

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for data.greymatterlearning.co.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

data.greymatterlearning.co.uk

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Certificate

The complete raw certificate details for data.greymatterlearning.co.uk in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAp20ddseqk+07k8BfwT4J
eYgztxr7auS6VLTUo0UcdqpIpj0yrPfhkz8JUWt/EUm/HcyIihVrglY9Tk70uZ/M
e6QBYmTTBD5wEeSJHIgO401D0OT9U83oPucNPLU++Ypl0p4GsGnLPezsMf3tyO09
+EVehV8/z9n0iZJNzJTT0Y5qMAX6dUZ4fT1L7x7OY0qbCW026gmedm0Q01m+vhYI
OcgeEkxLK3bMKFUZ+eVTXB8FTdernfuk54CWb+COQDWEXzXnUeWOrw/tQ4Qkd2Ob
uLkOS92LxeBqrtXIt2BycyUFpv5Q+/eykNZaxmEqNoN8+2BxraJHNoHGSbUo9s9J
VQIDAQAB
-----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 408126483788130128378773639496935259727930
 . . . . . . . . [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 2024-01-11 05:37:46 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-04-10 05:37:45 +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 'data.greymatterlearning.co.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 21135603587431026897071802136019229097490385172139532771349637170570633101898969817960194536829946531761956669630211574967871056180869715939651807966734436686137369521398422128737489161952389109452716929857605564292151375983523833781737855068427713027778167670250670605217670204986313420584568608629722629804550944150576206683034322823574731313491832151391872244551806583337701239181845537864404911708837776925974711442002295122303309866287721841363995478390139084624605236956885331292894940206136311002035342112297342437093251490340718328112287718108311497524330600712797355896666625275534937408675464648807060293973
 . . . . . . . . . . . . . . . . . . . . [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)
							77a0d550f3a42fc2578faeaafa234dad276cd066
 . . . . . . . . . . . . . . . . [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 (33 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'data.greymatterlearning.co.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)
							00f100770048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018cf73db9900000040300483046022100d92d18c741ef0682fe33f3e4a38553ebde5dc5c59db38ca9193717c8c577b68b022100c7acc90b284b5eaca27b39b547a31eb343de0bbacc5b66ccb117173e314993a9007600a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018cf73db99c000004030047304502203e10afa557bcc955bf27b81d5a0df84e76505839114cb9875ffe906653da325d0221008a2e2ef78b3b3962e45b0c1977ed0f453a97f5df81f12bdfcaedc65ba20c1710
 . . . . [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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