app.greymatterlearning.co.uk

Issued by R3

About this certificate

This digital certificate with serial number 03:a9:10:da:ac:9f:f1:8b:c7:bd:37:da:d2:3a:ad:01:58:b7 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=app.greymatterlearning.co.uk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:a9:10:da:ac:9f:f1:8b:c7:bd:37:da:d2:3a:ad:01:58:b7
Serial Number (int): 318866980874813544050724090397406699542711
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: a1:17:af:bc:42:b9:ba:5e:55:9c:68:0e:6a:7b:c6:72:81:b1:a1:01
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): a0:fd:62:b0:ab:29:ed:2f:b3:75:bb:7d:4b:a4:c2:2a:57:22:b5:ce
Fingerprint (sha256): ae:90:19:25:ce:c6:36:45:71:ce:9d:bf:e0:5e:d1:e9:7b:d4:28:1b:bf:1c:be:98:de:42:54:2d:fc:b4:3d:7d

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

Revocation information

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

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

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for app.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

app.greymatterlearning.co.uk

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Certificate

The complete raw certificate details for app.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-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAopMdVml9ZCb5qlJ4LJeo
q+nmFfKZkcJMgu9VMqCKNlFCJ17gheQ76e8xvJjE6O3kkIHLACqqNoce49VDbSV2
+BLdRT5tzsPaOunyTu75FJtHgIDv+ShD+kOchxVuZwsVf9ikRqsPT+3aaynRepgo
RbDcxdETWJvgfxENoq+LVcC29iB5JJ6zPa1zr/xMvtrTvlrT+ozkCGuXCMIOT+hF
jg6M63mPqZEdxfbtSRbBjW3w1eiaV8jXGS3VlCyePMyitcaKPdXv1jxUAAFkTUPy
T4lZY4aBEsLpv++6rol6KSZi2RcgxnVZDY+ILm0a8CBb4Jdb3ZpNHgc/UBxttcgs
lwIDAQAB
-----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 318866980874813544050724090397406699542711
 . . . . . . . . [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 2023-09-21 23:40:28 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-12-20 23:40:27 +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 'app.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 20523150317445625007365731122185144605808454448127741550246969012321350467285498105293443720752987409238745245038988905155341736041940365363876468367000678502347620285087793416562515502316823671684425216794641208544102741987587295671008445279218025306808233780290764251729977438151213119911572787163315268072064683782593096241736583444340157861691437007043567150292491965206627547516335647057532418645284638820681294455280920413899162084149247502505901920530424565684777387362624983940808884641195691757256941886733816549418235451595240818825617026749962297495744709485547377771555212126264047014353582462635856112791
 . . . . . . . . . . . . . . . . . . . . [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)
							a117afbc42b9ba5e559c680e6a7bc67281b1a101
 . . . . . . . . . . . . . . . . [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 (32 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'app.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 (247 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
							00f2007700b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb4990000018aba54b5180000040300483046022100cc37f184491b7140fd4b9138498e136be11f7b429ed4700d074bedd70b865d60022100e80ee2878b155434dc86c2aa21639a9ecd2d1f7b1cd16ce8ab42f61096ff1963007700adf7befa7cff10c88b9d3d9c1e3e186ab467295dcfb10c24ca858634ebdc828a0000018aba54b5480000040300483046022100db0dddb6b2e2fd55039b6e45c573a60e6f9ef2efd25f9ca5a1d9cb8dfd950e74022100bf57b902419d5787ac230855261f14b59d0924b2cd0f36ff0895d3a9b9ca8ce6
 . . . . [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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