k1.k2.t.u-tokyo.ac.jp

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:11:6b:b0:b5:da:ee:cc:84:3d:c5:02:7a:74:dd:8c:aa:80 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=k1.k2.t.u-tokyo.ac.jp

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:11:6b:b0:b5:da:ee:cc:84:3d:c5:02:7a:74:dd:8c:aa:80
Serial Number (int): 267264802961194564313570872568202415352448
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 4a:ed:fd:af:d4:27:5a:6e:29:e3:43:7d:a9:b5:5e:b6:1e:80:96:96
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 83:a0:10:17:47:fc:6a:ba:96:3f:20:0f:82:aa:6c:49:d8:46:9c:89
Fingerprint (sha256): 05:bf:3a:33:93:f7:96:7a:84:70:9c:45:17:e1:da:53:64:b5:c3:aa:f4:42:86:8f:dd:e1:53:ca:29:77:f8:dc

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 k1.k2.t.u-tokyo.ac.jp

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for k1.k2.t.u-tokyo.ac.jp

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

k1.k2.t.u-tokyo.ac.jp
www.k2.t.u-tokyo.ac.jp

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Certificate

The complete raw certificate details for k1.k2.t.u-tokyo.ac.jp in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAviriRoBD14pAak/BSZZa
t1uFmcrXdy23fCnVRrPxbohZmthXVqG+ldrWbvHluFqP44jtfgknloFbffZb1L5n
BrASNQOEF5hLhuP4HbaS+z6xye8OQ4x3gQm6sqPiI2OmF2+k+riKlNM3ryBi+1lj
HqW6lUrf8zv/cemcddnRIbDOIKYzamYVeyH78aSc7gfcxFSCzS9Zw+5MDjBAx1VB
RCUkJ5R4q+U7anb3EonMTdy3GX4DvVipHZl4836i8TTTUkg6tbJIfe4eH7tRIFCC
pG0y/P4Eslg0YqKtY9NLwjcIGqAMns2m2cXoQfBgHM9HG+FTcqcFAkt3V/aQ1Kth
swIDAQAB
-----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 267264802961194564313570872568202415352448
 . . . . . . . . [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 2020-03-06 04:40:09 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-06-04 04:40:09 +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 'k1.k2.t.u-tokyo.ac.jp'
 . . . . . . . . [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 24006424777005629874797161391392438167775594412121901721735858484805152522270504490479951408934728763150503263804653223517142906009817091132304754976404334275328036784724662271938394800078964239907272589673495539872461970934959251226473902225056158522528167919400951769089158116525832833795933537065586239821288123745671136433197964884727517870582586051934129646302235503814378470450095992883309510825707804125446744917898292660801968841801887058112782957975175078631024815327562766479041105826406634090689174641232119643601267708970689344892699998103874991583169961125884651958723582418908646977926907834311474110899
 . . . . . . . . . . . . . . . . . . . . [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)
							4aedfdafd4275a6e29e3437da9b55eb61e809696
 . . . . . . . . . . . . . . . . [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 (49 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'k1.k2.t.u-tokyo.ac.jp'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.k2.t.u-tokyo.ac.jp'
 . . . . . . . . . . . . . . . . [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 (243 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (240 bytes)
							00ee0075005ea773f9df56c0e7b536487dd049e0327a919a0c84a11212841875968171455800000170ae5bb06900000403004630440220722f9cfa1fa552f57bcac17324d64822566cc0db89847831f8cfefe6bc1e6e170220544559755320468d59ad01edfe86d8693a8e2eb24177484b69b91529bb7eb65a007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e00000170ae5bb05b000004030046304402205b601d619c134fdb99abf845df4030ba614ffe6f41917ae6e52275fe8819eb7302205b5e460ebc6733e37d89d6217d189093c6337239e58af65a3a472b16d0c45eb0
 . . . . [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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