khaothi.edu.vn

Issued by R3

About this certificate

This digital certificate with serial number 04:50:e3:1f:f8:88:ae:60:b9:a3:e7:ca:af:56:a7:e3:5a:8f 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=khaothi.edu.vn

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:50:e3:1f:f8:88:ae:60:b9:a3:e7:ca:af:56:a7:e3:5a:8f
Serial Number (int): 375973633837828433279174348320594926459535
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 87:2d:8c:39:70:82:08:78:de:8e:42:8d:69:65:5e:37:80:2e:cb:70
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): c3:9f:2f:d0:82:8e:e0:7d:31:cd:8f:a6:2d:e6:fa:88:40:96:63:a7
Fingerprint (sha256): cc:6e:26:33:4b:4a:67:f2:07:3e:ca:84:da:fb:e0:51:0e:7e:89:e1:57:70:84:6f:69:52:b1:67:f1:fd:54:db

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

Revocation information

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

Check the revocation status for certificate khaothi.edu.vn

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for khaothi.edu.vn

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

khaothi.edu.vn
www.khaothi.edu.vn

Other certificates including the domain name khaothi.edu.vn

(limited to 100 certificates)
hubt.khaothi.edu.vn
khaothi.edu.vn
isos.khaothi.edu.vn
utm.khaothi.edu.vn
chuanchauau.khaothi.edu.vn
isos.khaothi.edu.vn
luyenthidaihoc.khaothi.edu.vn
toeic.utm.edu.vn
isos.khaothi.edu.vn
isos.khaothi.edu.vn
toeic.khaothi.edu.vn
toeic.khaothi.edu.vn
khaothi.edu.vn
khaothi.com.vn
khaothi.edu.vn
ielts.khaothi.edu.vn
khaothi.edu.vn
ielts.khaothi.edu.vn
chuanchauau.khaothi.edu.vn
isos.khaothi.edu.vn
humg.khaothi.edu.vn
chuanchauau.khaothi.edu.vn
ielts.khaothi.edu.vn
khaothi.edu.vn
khaothi.edu.vn
khaothi.edu.vn
khaothi.edu.vn
toeic.khaothi.edu.vn
isos.khaothi.edu.vn
isos.khaothi.edu.vn
ielts.khaothi.edu.vn
khaothi.edu.vn
toefl.khaothi.edu.vn
khaothi.edu.vn

Certificate

The complete raw certificate details for khaothi.edu.vn in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtIp/W7hfuEuQPPBS+9al
sVVrIYZcIsvp2YR1rA+9E+uw59QTvj1DJ3oWJtGQnjASEN49kciID0/LwYAB2d+x
j67/iX99ZlmiYHa8mAD78DAa0bZDKnOao6rraqiLzwVQU+9ffAl/XjBTnFI5FlHf
pqvSOezThMNCpFmuRjDq76Qv3V2SbjnvnASgxGprRCzyiMBO2xWZLGTPdMzzoMn1
TNEFA1byu20AnpRASOeTOnuSuWTaDgqY5th9O4HXnoyG9HBDEpvDJH/WwBpdA1YH
S/sZTvw/pzV/1qVB88dGgSbGLy4c5IeRurX+WLPZcxi9QoStJ0L53/s+ojs9E7zg
oQIDAQAB
-----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 375973633837828433279174348320594926459535
 . . . . . . . . [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 2023-11-01 10:05:35 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-01-30 10:05:34 +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 'khaothi.edu.vn'
 . . . . . . . . [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 22791190553245610989883735200990119012697334769795469655354077826964725606734233992839284629594561026724935458499378148571528304387267064575758422941780892821434508892607477596941750183790923647136539208059006480853549438042900383517906485162033852524270091754032704588156865223154457470468047551655857571064147102884577599732775956698741894924078904906376858743007838344526118055538919461671582320364789240484534724135557083629385167305304809069807419982360070150053354307623672993064228053168054161008317621861312550666929170121084726856682154129159354831934440162220746910458003647574780037632957676390459616583841
 . . . . . . . . . . . . . . . . . . . . [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)
							872d8c3970820878de8e428d69655e37802ecb70
 . . . . . . . . . . . . . . . . [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 (38 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'khaothi.edu.vn'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.khaothi.edu.vn'
 . . . . . . . . . . . . . . . . [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)
							00f0007600dab6bf6b3fb5b6229f9bc2bb5c6be87091716cbb51848534bda43d3048d7fbab0000018b8a8f670000000403004730450220660b42cf85fa95a3f023b657c24af5770e803c0c891aa2f7101ab5a6f35ada03022100a59be1b4c0ff96947108e0c1c3858eac326dedd37ef4f9a472db2825f70a14ba00760076ff883f0ab6fb9551c261ccf587ba34b4a4cdbb29dc68420a9fe6674c5a3a740000018b8a8f67280000040300473045022100f5c5a3bf7bc12c5b354a8c89831e3cf391c7aefba8cfb2d89676906c36de25b502203074d9e8561e12d2acc5e8b539f844d25e933a29f7fb2040de3c53f6535a617e
 . . . . [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)
		002cfcf01cbfb5346a4df31907c05a10cdef8e74f1fd90acb4e8117c98d35de2d00fac2a71f6deacc5601505247ef75fc601c9feda9eb6beb216583fe191e1928d6a1612388f461337c215e06390f5eb36207f3622cc8722e3140d74fe1dacd9cf603d70ec03d125633fa03c8c109d4718b9efd78e4c4e77f51122a1be43b064d24e754d6246470437df048bce866848d1427f9ffdf1d637cf1b8025190c03aff3da2c0af47ed350c376da36a7bc6bdd59ad2304f781cab0e3cdee8e499b04549fc3e0f25e7e48f58722b7a967b9c4fc90aba14dbee986b21dc5af6188c7a2091b650449cb455d7cc67f085b5fc89cb99475e6719f64c9a238f61567581775c409