www.davidfeldmanphd.com

Issued by R3

About this certificate

This digital certificate with serial number 03:d3:01:0e:ad:e3:9e:b4:9c:93:e3:35:25:7a:71:c3:28:5f 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:
  • 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.davidfeldmanphd.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:d3:01:0e:ad:e3:9e:b4:9c:93:e3:35:25:7a:71:c3:28:5f
Serial Number (int): 333137842662641331434196949780157037750367
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 3c:53:e6:10:07:00:b9:51:72:4e:a5:6e:30:71:48:fa:38:ec:5a:bb
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 2d:2e:42:70:98:af:8c:e2:ed:79:84:25:ce:38:d3:08:34:f6:b5:86
Fingerprint (sha256): 4c:0c:9e:8e:bd:df:15:b4:a8:8d:6f:5e:88:e5:f0:75:1e:c1:a2:78:5d:53:56:b4:49:d6:14:31:d1:b6:33:63

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

Revocation information

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

Check the revocation status for certificate www.davidfeldmanphd.com

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.davidfeldmanphd.com

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

davidfeldmanphd.com
www.davidfeldmanphd.com

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www.davidfeldmanphd.com

Certificate

The complete raw certificate details for www.davidfeldmanphd.com in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqFKsC1qBGncbDC/hxZnL
izSqqXvb2cRGMkzG8TB96qe0uokaIQWWlW2SWj2DVLnDVuMkB4FHAnF9W6YYXB5D
zLBIvoCGbVvTEJ17jrU1DAYcR6OOUygT68vVot0XwywemmvSOQZQ3+HN8GVJkl/L
c9Zi0QsPxSwTngHkaNqj6eyf4WJ3FVd3yjPSrCpdU8XELZ54CK8upIb7QZtNSl90
I9mAwb82U9+zT3lB6aPXXLAYJRJWkyGeeUjGI9WK+vjeQHNDhyHWiqqgd/yhIxBb
9oKj+TljBJnkP0F3kfKrFVi0bzDB7IOvI6MFcVeI4douE/ZtgrbuL3Mn149RaKrT
pQIDAQAB
-----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 333137842662641331434196949780157037750367
 . . . . . . . . [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 2024-02-08 14:31:21 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-05-08 14:31:20 +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.davidfeldmanphd.com'
 . . . . . . . . [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 21248802340696426198003024490063569274942878392907980533230496348889363209568125161859847375621576318498608608636518639699733633314213996358380115767399350515179991028544827861847239302308982094049095033796258615633851622462554090495278989242523503165791951467710268369198178444407740014371646921618462997468796740127151511797441762495281149411786873366500083580460999615601548628201062196284828757621409664559272717609250382976449004541164987993108189066006565027235642987235529029969410766586294483011068474808712242468600615707757081422868428931827212945782542532206148922956185673228293983415373975630910556132261
 . . . . . . . . . . . . . . . . . . . . [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)
							3c53e6100700b951724ea56e307148fa38ec5abb
 . . . . . . . . . . . . . . . . [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 (48 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'davidfeldmanphd.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.davidfeldmanphd.com'
 . . . . . . . . . . . . . . . . [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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f000760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018d89584b690000040300473045022100e9c9be8f437ba34df739a241030def8f2f572c3c17d88dbad436c7ea8e2ca86b02207a70639d30668de4bd48da2760524b94c5d36a65b0aab4dd3f6341e0959af1d300760076ff883f0ab6fb9551c261ccf587ba34b4a4cdbb29dc68420a9fe6674c5a3a740000018d89584bb4000004030047304502203b8b2c9dc6fcc609c3f8cc9fecc2f2916bbb243024ae62a24efe354a103a10bc022100f50a154d04e94314440c76d7416bb4708c956bb1c0b53681706a99e43ba84dfd
 . . . . [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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