loveyou.at

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:75:ea:a5:fd:15:ef:d5:c9:48:28:c0:99:7c:98:5d:a6:8c was issued on by Let's Encrypt.

With 2 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=loveyou.at

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:75:ea:a5:fd:15:ef:d5:c9:48:28:c0:99:7c:98:5d:a6:8c
Serial Number (int): 301461795938213515231650538842496454993548
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 16:17:fb:b7:dc:87:81:ce:46:b2:e2:8d:90:e1:35:a0:1f:46:82:a2
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): da:f1:27:f8:13:53:d6:dd:50:2f:04:2e:49:10:13:02:03:5b:0e:00
Fingerprint (sha256): f2:1f:f8:c0:02:49:95:dc:a4:9a:49:d9:2a:f1:f5:d9:36:a4:19:c6:2c:e2:60:48:4e:77:b4:25:72:74:a1:f7

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 loveyou.at

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for loveyou.at

Public Key Algorithm

RSA

Key Size

4096

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

loveyou.at
www.loveyou.at

Other certificates including the domain name loveyou.at

(limited to 100 certificates)

Certificate

The complete raw certificate details for loveyou.at in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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 301461795938213515231650538842496454993548
 . . . . . . . . [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 2019-07-11 12:53:41 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-10-09 12:53:41 +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 'loveyou.at'
 . . . . . . . . [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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 625652851412297460140278018677874184416289054787155536284615432811148491712834714674621759435832182697895847299307454248980734586039677343200281180961566256565912708458703061281465726100759828325597530678053695191630349639225129113884558615853959574030625342724479222704610918112693278224020236779172846514732567925777448465359749119624480845120727310998952707826449329541545413445040075981069513277875581838248309810252207021687229199190960335814518224086667074825083275273578952774952872047440292017015643642137538505673607199543760469709135689505087489728392295797786741920358234276555041205859624497618753148414750347855051195442591835185267948525275256969564972691908752865918752284505415915564727946304447059495823967441752167228431840532427518577806691204225285016113015414237167391096568768440715169648322664361184185068976247145331375336039395252961794252280286947475594159401782888219122841713117306692860037022170610657319209869714968255987453880806782259515151078479550191021041314259918777467864312597779741610304219438096047606880496360381923061504777099326768786353557934804154814089009414004839514802313850079710897411329328271940510120661767526115781084766648266255755855917675179574244633558797936246808119411559131
 . . . . . . . . . . . . . . . . . . . . [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)
							1617fbb7dc8781ce46b2e28d90e135a01f4682a2
 . . . . . . . . . . . . . . . . [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 (30 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'loveyou.at'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.loveyou.at'
 . . . . . . . . . . . . . . . . [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 (69 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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef0075006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016be14fa5690000040300463044022028a9398ec17d1b6d4b80b2bbf9ab4f10d6c8666136d75b7cbcf607a70e323dd402206e6bb60236e7247a1545c6e17efaa343fc15a321d3d07488c4ed1d594775d11f00760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016be14fa4bd000004030047304502200d22665117ec5ca1ea78533afcaef546e568ec415e3d14f9fd1ad193ea31cd39022100f76b5f54ae2edce8b49dabd6c162196df20acc952304d48476289e4eb6ac8491
 . . . . [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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