www.zkse.de

Issued by R3

About this certificate

This digital certificate with serial number 03:64:b2:be:0b:a1:dd:43:2b:fd:a0:0c:29:17:f0:57:e7:22 was issued on by Let's Encrypt.

With 4 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:
  • 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=www.zkse.de

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:64:b2:be:0b:a1:dd:43:2b:fd:a0:0c:29:17:f0:57:e7:22
Serial Number (int): 295602683842958140126741139810102325798690
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: ea:5f:30:53:ca:25:b4:49:43:6d:60:eb:3b:a8:b4:2e:67:f1:02:81
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 9c:2a:83:c1:6d:91:94:b4:48:b3:7f:06:8e:ec:7d:8f:ba:61:dc:b7
Fingerprint (sha256): 3a:a6:06:5f:d0:15:9e:d4:bd:cf:7a:3f:ba:f3:96:fa:2a:d3:55:bb:85:ad:6d:ad:b3:88:5d:ca:20:a3:7c:cb

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

Revocation information

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

Check the revocation status for certificate www.zkse.de

4

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.zkse.de

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

www.zkse.de
www.zkse.uni-due.de
www.zkse.uni-duisburg-essen.de
zkse.de

Other certificates including the domain name zkse.de

(limited to 100 certificates)
www.zkse.de
www.zkse.de
www.zkse.de
www.zkse.de
www.zkse.de

Certificate

The complete raw certificate details for www.zkse.de in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyuqRZRBfA3tMICnWsJyw
RU+8A7mDKLqc8kj6jmy/DJUOSBlYLOrcD/l5WDdieRAgGhEjg3+O28mH+AUyuR1B
JBxjGaa1FotJutxbG0awQLr88CGWJjlPSS2BWrEz46DXT+BzkL+/TvjnJDJGsjSR
BnBW049jtRErQrJugwGPr9sKrtV9Kf6PyHGD6iikm8464F4fhHB7z34M3WblC38V
8E0issMW/gtcFwHLVx+DY1lh3dW3YvR3Ks05Qhb0gXBNI+8HVDJrtt5QYICXWANP
A3lAcfzIvrq9UIicgtF++lhkyasWBbkTzz+itqH65Q+5ktDk7nb+qmhmf4DcLUef
MwIDAQAB
-----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 295602683842958140126741139810102325798690
 . . . . . . . . [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 2023-12-04 20:03:55 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-03 20:03:54 +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 'www.zkse.de'
 . . . . . . . . [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 25615807369553111845020332224749317721629450034018152799930228809449412125645307659863957108523135964562778858263229358192158702202621279327216086303970634176929746566749181833279920487687859294771844324494823976197673070419572234026445466741578592685513729259393639077895482191301938095108884985874128348135766566086246793692076571050684827572020945524949546790895670873434432381180762222767898089749863916926501370928354505724454503344256430705551989760576517779558396094393887416723714674638789992646594288476921414133062784276335975834325580735986215504923520195471928579153126269548005978707371493655114972372787
 . . . . . . . . . . . . . . . . . . . . [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)
							ea5f3053ca25b449436d60eb3ba8b42e67f10281
 . . . . . . . . . . . . . . . . [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 (77 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.zkse.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.zkse.uni-due.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.zkse.uni-duisburg-essen.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'zkse.de'
 . . . . . . . . . . . . . . . . [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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007600a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018c36a50c230000040300473045022057e46613726287345422296d34eee38dbb3a2b4df1fbd33396279e7db8ff3a950221009a161edf83d91bd35565e824bab8e239669302cc1060baadf4b1f6aa06b95432007500eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018c36a50c1b000004030046304402200c403020a2044e1ee0761a57d54a3b72ed8ae8d5cc0668c6507dac64156bc4de02205b324801672f25580eb372807ec5c14e55fc2295f2ca0520315cb0f9bfd0757c
 . . . . [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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