www.thai-tasty.de

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:07:70:55:ce:87:91:35:20:8c:67:44:5d:91:76:ca:e1:1c 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=www.thai-tasty.de

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:07:70:55:ce:87:91:35:20:8c:67:44:5d:91:76:ca:e1:1c
Serial Number (int): 263868153433405315067097012558644948689180
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 88:7f:aa:9c:f8:5c:92:a9:bc:94:d6:a6:52:c7:0c:35:b3:48:dc:b1
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 7b:ac:10:18:08:af:e6:f9:9b:fd:53:05:72:42:6f:02:45:18:e7:dc
Fingerprint (sha256): 16:f1:98:d7:92:fe:d8:c7:57:49:31:6b:5a:07:d0:00:9f:02:d1:47:cc:54:17:09:e5:d7:c0:a3:74:ce:2c:51

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org

Check the revocation status for certificate www.thai-tasty.de

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.thai-tasty.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.thai-tasty.de

Other certificates including the domain name thai-tasty.de

(limited to 100 certificates)
www.thai-tasty.de
www.thai-tasty.de
thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de
thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de
thai-tasty.de
www.thai-tasty.de
thai-tasty.de
thai-tasty.de
thai-tasty.de
www.thai-tasty.de
thai-tasty.de
thai-tasty.de
thai-tasty.de
www.thai-tasty.de
thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de
thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de
thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de
www.thai-tasty.de

Certificate

The complete raw certificate details for www.thai-tasty.de in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoN26Wm3uZUoOVZSAWCAp
f4Zj7Pb7NY/FEKrHHgk6gOEtg4tgzBwilgrPbW75fMSIbOlraTp/tnWWdnva7KDz
tmcB2al1Vvq6Jn6ESCjeF81/coJTWGHmndgPrXVIkDh8hULYQs2a6LZe8dPFbgRY
Vrj2Al6O5J3hRXVR6vJWitEbzIJzuTO42Uj7lZBJWn61qVw8aoEZgCyI+LX+twKN
RH+YE8vaizYGVV121yhRdBSpkWgNKHWiuKK6eJGKTNQq3oGPm34JjtT0ip9ODlPJ
Qa2vpIvaF4dJ3gs0GjNtDWMH9S8YJ7xgyl9hIl8QiD/VM7En71c5iEepB5o5QT1E
6QIDAQAB
-----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 263868153433405315067097012558644948689180
 . . . . . . . . [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 'Let's Encrypt Authority X3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-04-17 10:20:46 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-07-16 10:20:46 +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.thai-tasty.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 20307466918026591639179309098678602843906956151294653856904364515373755970844154665779752742572842136200927661040567205228872392025976469330582747276082857482506329522784448262948144356005817894562924930280576388856477909662375944949103686302967133300607626908643963639800965519314265041208473891169444735955113710472205364746387640149936025263401811235587089150057153489269687936940185845128577213552788350858997981474665755871939572701049864444026295711523526582578462688915151533742691613652160500950526747120556014990718982915219434567695838976123920553148465325304767005201626305816938310173849546824046234911977
 . . . . . . . . . . . . . . . . . . . . [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)
							887faa9cf85c92a9bc94d6a652c70c35b348dcb1
 . . . . . . . . . . . . . . . . [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 a84a6a63047dddbae6d139b7a64565eff3a8eca1
 . . . . . . . . . . . . . . . . [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 (99 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://ocsp.int-x3.letsencrypt.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://cert.int-x3.letsencrypt.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 (21 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.thai-tasty.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 (246 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 1.3.6.1.4.1.44947.1.1.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.2 (unotice)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/'
 . . . . . . . . . . . . . . . . [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)
							00f1007600db74afeecb29ecb1feca3e716d2ce5b9aabb36f7847183c75d9d4f37b61fbf6400000162d355ebe90000040300473045022100bef2d6da2b8f7e95314659077e1a624ac585e63eff619138ee0df98febf8bc2b0220254eec40f6ce14deb919c00797b920aa4db69a75bbc17a2b1b8266b3c38f66f9007700293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000162d355ec0c00000403004830460221008c4b344f073ecd0a145e3bd19a331713bf7411f9c0186a0cd840d3952e730f3702210099104bace309656dd26dab531926d214ad8209e1186daad79734d68dc331a909
 . . . . [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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