research.wiki.iat.sfu.ca

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:11:c6:d7:2d:12:9d:b5:00:90:ba:c4:ac:35:df:cc:12:b1 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=research.wiki.iat.sfu.ca

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:11:c6:d7:2d:12:9d:b5:00:90:ba:c4:ac:35:df:cc:12:b1
Serial Number (int): 267385962434110039203891172484112901214897
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: e0:ec:6b:ee:63:9c:a3:3a:38:4f:6b:28:47:37:ad:44:d5:3a:ce:55
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): b1:fe:e3:2e:87:9d:1e:9a:b9:39:cb:13:14:3f:a6:dc:2c:77:de:1f
Fingerprint (sha256): 00:65:ab:23:19:5e:12:46:af:39:43:26:45:54:17:56:a5:c3:e2:a4:33:0e:ba:75:27:87:88:dc:92:d6:b5:be

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 research.wiki.iat.sfu.ca

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for research.wiki.iat.sfu.ca

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

research.wiki.iat.sfu.ca

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Certificate

The complete raw certificate details for research.wiki.iat.sfu.ca in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEArsn//Ufd2dgMTHVXQ5Ew
5SHC2cs9dggTZnr9LYeRMnwDIl4VP2eG8NR5WZVyl0L1MUPcvbq+dDKvHH/YiakD
1HmgUGp0BLoU3BB5S4NPxsxxvEI+fymKQLJSUxfqVWto71sCaLPShxRe9nYIO6qc
b7Pm00QjAYlLR2XWUUIzAnPb2dFnSRzWKFbwb4nbtfOs7P95GW9thOoU+MbAJw7p
fCsO5z5Hh06v5ThZ2UERo2L0K0p/WlUjTmyP0/z4c642r3LaueXcDYGxpaQuNXrz
omVaoX/TMs9IDqgGPWGS0QPT8B9+rcIEotyZY4oc0CPBVMZ9Oj5HBtOTm2gaONZR
a/s92vg2ck4B8RV5ue11uJq60Hle9yUGMecwLxEmZJBjL9P7nNtf8CV7EfUOTtS7
NFASep9egNzNan9EmqiK+Qn0fiU5E5L8hu3KiFUGf1ynzcp6Lu+mvLZxI6c2K9KT
ZQ6OWaW4q3frHeaHWostzLQpiwdBCwJPinJfn5ZaEhMRxJ4KfrCYUuWgH6C5o1Uj
D9mxYjBqCsWqUjkzxHn8fT/j1g1437Hrf0UlM9WD6Mvgu0WOVSdyK9Ue0kAdH/wx
HdO8F73qANjpGoHbzN86JAelt58AfrEvK+2xE1IYZiOUNDOSLv6cTNdhD8fs8YGB
iIdobbNdfamUY4wqWZlYqWsCAwEAAQ==
-----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 267385962434110039203891172484112901214897
 . . . . . . . . [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 2019-11-30 08:11:27 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-02-28 08:11:27 +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 'research.wiki.iat.sfu.ca'
 . . . . . . . . [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 713077161321690675363274162885238589980073496827634896496738297063870759268754134341053582760806156780808760450942614955371892187767477708398050508457863956027145286965384539844887738126602839995097658249932198417015651097161922956350866640825479847395915963158683418171493249707473708864624256529275949896508036235179894060736087726614404595107030378652963857155822309409758577081473530588669570285823284728403663941778397062367122210625574619429713222341555792329439042628114779227918267586046955004547711625662979821977497714054973968043767881655507016783765633247332810200203342673756853002371340875266691615430726439088357074327709605544650582229377617718435964899064595833691414991962986332971250920999913618489499151142628069561910869217582004564661213270120135898223982007726781488155130765713165366307063744488621502011769407252096086323343237982774283057238049567398496551329537235513847993162230296527985001604461490221130600843873079473482133047988653922556356652173107022644277378162580544490092182005610572984227333089113068094789072451462761757679663394864883124920293404141697481839555693393432967157277228625024872096641292143998816833952782512324048351593154370502501867670173595661522856245809166527397602256267627
 . . . . . . . . . . . . . . . . . . . . [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)
							e0ec6bee639ca33a384f6b284737ad44d53ace55
 . . . . . . . . . . . . . . . . [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 (28 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'research.wiki.iat.sfu.ca'
 . . . . . . . . . . . . . . . . [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)
							00ef007500f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000016ebb944693000004030046304402206a7fdad47016dd75c52ae21f0ea00589fa450b53563fba61aeba78738c48ba470220620bab181a053fb32b3b07475827e7f781ddb0e14ec6bd4bc0a5f83ff7ce807c00760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016ebb9446e70000040300473045022063eee098dc2b12fc5cc5b7adcfc7c517331255ab1a3f098e7df2616f8515e5b202210082727cd210a84217445ff7e429b9305d956802eb2fc2930951b601b621a759ce
 . . . . [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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