webmail.psc-gpc.ca

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:b4:21:e4:46:26:8f:41:7b:9f:bd:c4:01:5f:4f:4c:86:14 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=webmail.psc-gpc.ca

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:b4:21:e4:46:26:8f:41:7b:9f:bd:c4:01:5f:4f:4c:86:14
Serial Number (int): 322632733631417989479323743988618485335572
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 6c:f7:ad:94:a5:fb:56:2b:86:bc:35:e0:c5:18:6b:0d:fd:7a:13:0e
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 26:a7:ac:8b:46:ba:c0:74:49:07:85:ee:e4:b5:28:de:36:21:03:78
Fingerprint (sha256): c9:49:4b:ec:3e:53:5f:ae:62:4a:39:2c:f2:a4:f0:18:db:f2:21:2f:3c:5e:e0:2c:3e:93:08:63:a4:b3:5f:56

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 webmail.psc-gpc.ca

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for webmail.psc-gpc.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

webmail.psc-gpc.ca

Other certificates including the domain name psc-gpc.ca

(limited to 100 certificates)

Certificate

The complete raw certificate details for webmail.psc-gpc.ca 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 322632733631417989479323743988618485335572
 . . . . . . . . [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 2019-11-10 04:00:24 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-02-08 04:00:24 +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 'webmail.psc-gpc.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 1017367804914752084229648357958673645589058743097399437021292500259803442521180585265914521900156157324660033245670808111147167346346301181912995216710920888186332311200220642680560939254414413825399478935291342027467592270798619028782370143021809478646608254896547826589582531258375192450823047350491568671925760441779597028387033196685135047854677856660833997465011249452964425535174656972395518067824743246352208301198030550296296295165257914508623420747140226718581008531904464186520120405266294074036327709172602934957978335653552169454852658735619221513969271501790734318923580683669477031683919029635622968670009557100814074473933761461110414076649265285807842309310410933424640912479684415157112858410050724295061845648267752305291228754849186213025468453356756710180581077751165488059349711435525137590330310478123270044726004597480183619604700004435672061381120994645015879640729632872302576364887444562374881765393096933866852668507006125236951081394721208373398184688919738998965114894526001171477713642278104192795355198100517837832697389768511823788475238923151443335010034992177682226652004591738747338967330425667735461894840970173912483032849564396389724972763971492671086046967822661499251428943609598523222737934347
 . . . . . . . . . . . . . . . . . . . . [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)
							6cf7ad94a5fb562b86bc35e0c5186b0dfd7a130e
 . . . . . . . . . . . . . . . . [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 (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.psc-gpc.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)
							00ef007500f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000016e53af3fb100000403004630440220620b20da2ee1a71371cfe298f46fbb76f957354924e62653a4ec2d3c18a9303d02200bb1b08c5e4c6a7e832b29ca9d48c09021fb024f19d4aa014dda1b3c6628b04b007600b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016e53af3fcb00000403004730450220280c0ceb9d0ca0ebd3b2b6335c5be224036cdec0acd3b3305a0314ae0446a450022100d3163f0992642e5886c63abe08bbf014b49379ad17cecdd4e384e74c6a35a5d0
 . . . . [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)
		000a7d620639c3f96cab71011f46b6497a7566b2c7b82b4c269a9c3b63e2bc3c80103b21ed7526c772daae8faec84109a61ed639e259211ce04cdc4a78085bedae3bb485a0a858801368b4839a2ac50da7d11a40910350aa7a93b537f5a9ee8838d33276a4411ec89889a21f71983cfc12f9a9d0ee2721de01d81d292183ede0d054f5f714660c3806822ecbcedc1b2519bd3b328f87f8643221ff4c984ac8955401178ca0b2ad4464fef9b09f1d2221b4fb74058020a82f87a42e9a415bafd8c597be21fb9144d26270c87aaf97aca30f9f4c62891780fa76a01ef13394cb5c9b2489e133c5118aaac66e6ef696c8856ec8e44820f2f1ab0b505ced85a478c0ba