thozhan.org

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:ea:fe:57:cb:1c:cc:e0:e5:89:7d:63:81:45:98:80:7c:90 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=thozhan.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:ea:fe:57:cb:1c:cc:e0:e5:89:7d:63:81:45:98:80:7c:90
Serial Number (int): 341301011415147346469056415100650137877648
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: ed:b6:58:df:fb:a6:f2:18:3b:fb:36:8b:06:2b:f1:32:65:89:7d:cb
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 51:6d:84:f5:a5:a2:2e:8a:48:8b:9c:18:24:a0:49:40:2b:9f:a8:d3
Fingerprint (sha256): 0f:f0:b5:c2:41:d0:e8:3c:90:94:ce:ad:0b:52:db:b5:e9:51:32:95:bf:24:44:27:ae:bc:c7:8c:c1:e4:3b:e6

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 thozhan.org

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for thozhan.org

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

thozhan.org
www.thozhan.org

Other certificates including the domain name thozhan.org

(limited to 100 certificates)

Certificate

The complete raw certificate details for thozhan.org 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 341301011415147346469056415100650137877648
 . . . . . . . . [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 2018-12-04 01:01:10 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-03-04 01:01:10 +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 'thozhan.org'
 . . . . . . . . [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 789350924978785170468945286210305112488359620118812615836092114062329711759843565439460956587040314913385755735600511582407044063628521122875243885516049581286622593215973503164339827293920659966970707322731465053624006092988165012137050660498778405782562825821494139371619875694931104715957010252967579337600265915318367298245123199288916042482518086069209704871668779346721141857681060984468952710563518325575497317786045208051804839142896274655108831379966288797080025024286786902276631722638090915351749304439336143746282997600498384585750365401418721355286311854064006880162087528098887318445878215659612790264216526522367899006208751674583934901135782072520381275667860068795497593118856259863451508812209638916721921527176491941651504033565052987688782522016358543411168456513806809148295631203151448044155253636074671096607715764269627415353657618283103711068564158834487056385626737013982435522104684957093517829340689260687148466981690844712055383384051780461468915750920436091313992391491334920491327197917742863441942481985141490944132986419174790213265383006170994412386365399798132576196626379281324609365156803792009746570409787001155759518242415173697675044843375426380129364363035175923050192510475228015645837366961
 . . . . . . . . . . . . . . . . . . . . [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)
							edb658dffba6f2183bfb368b062bf13265897dcb
 . . . . . . . . . . . . . . . . [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 (32 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'thozhan.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.thozhan.org'
 . . . . . . . . . . . . . . . . [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)
							00ef007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016776f29d5e0000040300473045022100ee32f70a565eed2f669015e0438e5df45a1b26403866ec25f30c75def5c3b56402206af3e2d29d903862de46259df3dd1f3936476c14e34db61ebf8e59a6a69b16ef007500293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016776f29f9f00000403004630440220279aeb1795974a1297470269be4abdc64a6b7a748877b5b993190c1d0d0bf8c70220447883b86c8233e838e76cfa22ae749c041e0c2e21ba8aefaaa8c865a72dd91e
 . . . . [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)
		0065ba4f8bb21af246b3083d179b9f01de9681c23a6bd366669420c7ffdcf8ad8114d40a7b814a4a41f05a4c1301972a748fe83c1fde75d11a60fe05818f7f1c2b8b81cbae8bcbcd748540c75058c4b2d4e100f3555d053354cca8c7afd476a0f4362f906517912c83904fc5a3788adb5e4e20a7891abc24afedcb88b32f00b32b52650dabb77a74b030b8797a5ef08ab33d8e05f06ed4efa47716546deafa6d838c72e548454605dac9695022df1469376bb5fc9ed81f55ebd64a0e3954e05025f72960d9eeb9be49be5dbd11e8586b7f58dd9beb1ec68e18bad56483f4454b200eef2532a4d75ea358b1ea9b68d3da0ec7257c93c7b5b2fd3acc3d91f6d64f5c