webmail.csie.cyut.edu.tw

Issued by Let's Encrypt Authority X1

About this certificate

This digital certificate with serial number 01:77:a8:39:a5:62:ff:30:8f:e9:eb:f5:d1:64:dd:bc:43:25 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.csie.cyut.edu.tw

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 01:77:a8:39:a5:62:ff:30:8f:e9:eb:f5:d1:64:dd:bc:43:25
Serial Number (int): 127829497214005648065068954287252862419749
Serial Number lenght: 137 bits, 18 octets

SubjectKeyId: 10:f9:86:4b:05:7b:cf:cf:c8:03:ae:8f:40:a0:cd:bc:db:e0:e8:1f
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): f2:bb:c6:d7:93:5e:6b:57:ce:94:98:c1:f0:d2:6b:28:c4:2e:58:59
Fingerprint (sha256): 53:45:f9:24:88:16:78:9c:69:e0:c7:ff:80:aa:2f:be:70:7f:a7:48:c3:78:5b:11:1c:87:94:73:1b:e2:a5:f9

Issuing Certificate URL: http://cert.int-x1.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x1.letsencrypt.org/

Check the revocation status for certificate webmail.csie.cyut.edu.tw

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for webmail.csie.cyut.edu.tw

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

8 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

webmail.csie.cyut.edu.tw

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2015concrete.ce.cyut.edu.tw
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ait.csie.cyut.edu.tw
moodle.cyut.edu.tw
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ait.csie.cyut.edu.tw
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admin.cyut.edu.tw
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lc.cyut.edu.tw
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dywftp.csie.cyut.edu.tw
www.csie.cyut.edu.tw
dywang.csie.cyut.edu.tw
dywang.csie.cyut.edu.tw
moodle.cyut.edu.tw
web.csie.cyut.edu.tw
webmail.csie.cyut.edu.tw
lc.cyut.edu.tw
dywang.csie.cyut.edu.tw
*.cyut.edu.tw
v.im.cyut.edu.tw
webmail.csie.cyut.edu.tw
dywang.csie.cyut.edu.tw
webmail.csie.cyut.edu.tw
webmail.cyut.edu.tw
general2.cyut.edu.tw
pheromone.cyut.edu.tw
webmail.csie.cyut.edu.tw
dywftp.csie.cyut.edu.tw
2015concrete.ce.cyut.edu.tw
2015concrete.ce.cyut.edu.tw
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2015concrete.ce.cyut.edu.tw
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moodle.cyut.edu.tw
moodle.cyut.edu.tw
ait.csie.cyut.edu.tw
webmail.csie.cyut.edu.tw
webmail.csie.cyut.edu.tw
www.easytest.cyut.edu.tw
dywang.csie.cyut.edu.tw
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ait.csie.cyut.edu.tw
webmail.csie.cyut.edu.tw
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webmail.csie.cyut.edu.tw
v.im.cyut.edu.tw
ait.csie.cyut.edu.tw
ait.csie.cyut.edu.tw
v.im.cyut.edu.tw
ad1.live.cyut.edu.tw
web.csie.cyut.edu.tw
web.csie.cyut.edu.tw
general2.cyut.edu.tw
www.ceapp.cyut.edu.tw
*.cyut.edu.tw
dywang.csie.cyut.edu.tw
dywang.csie.cyut.edu.tw
ait.csie.cyut.edu.tw
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Certificate

The complete raw certificate details for webmail.csie.cyut.edu.tw in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzuGr6ZENRYgi+z9Ff4YS
7DSD2fqdhecXFa+ovTkoasf0tJ6cVWUXmgc3AEHVeR65tKAYvfhaNcD5oPSWA7Ne
YyuX1M83vqlfAoAP/TESVhVj36LcK5OnOHt/QJOrNxcVYMdcHrANN/gLQUazyHYi
/P+4pH3+bHR3Cgi+7enIuzdNCJz0OlonEXYgspyGj+2/yPJgu+Jhum3ZltuhZQ+9
ystZvTmhVoz7bb0OKcOXoWKbO063B5IVrprvT/S4GDo3iJWaVFJ8pg7mA4x/iKDX
Ms0N7owo5LpTYjHBVQ4BN+HLSGmmhPMy1oyNrBdWEgH9pxCmH9SPWcznK1rdbaEh
zwIDAQAB
-----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 127829497214005648065068954287252862419749
 . . . . . . . . [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 X1'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2016-01-27 00:29:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2016-04-26 00:29:00 +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.csie.cyut.edu.tw'
 . . . . . . . . [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 26116373603345320135783064994088594542079439823433260057227944108392053914589070004410406293546314339779792048595364396859501080440937940865658138534311314772880846502078964581714287406181226096612752628058915003143481868224177835948087594903680116786878404361304079413098988571487635527231726931452761472831473193773768441249313156983923722008631441763249571606929516393888727139134864362959501236617427975688224308701240675623773678868816640512848969322941343221847178913309700509842209861819551734290696221391004103030783653982042831322154900070595706733841283567300742273087386199167621167386108869308804883358159
 . . . . . . . . . . . . . . . . . . . . [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)
							10f9864b057bcfcfc803ae8f40a0cdbcdbe0e81f
 . . . . . . . . . . . . . . . . [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 (100 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-x1.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-x1.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 'webmail.csie.cyut.edu.tw'
 . . . . . . . . . . . . . . . . [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 (246 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 1.3.6.1.5.5.7.2.2 (unotice)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/'
 . . . . [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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