fyi.cs.it-chiba.ac.jp

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:f1:cd:c5:a3:b4:b1:34:c7:c6:9a:d8:32:b5:43:e1:e9:56 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=fyi.cs.it-chiba.ac.jp

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:f1:cd:c5:a3:b4:b1:34:c7:c6:9a:d8:32:b5:43:e1:e9:56
Serial Number (int): 343618426165192626051618480903394502502742
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 70:87:3c:b3:c1:56:42:c0:74:a6:ca:2b:bd:57:d8:11:6a:7e:76:28
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): d8:2f:aa:52:53:c4:4b:cc:12:2f:66:11:d4:6b:21:74:a5:ea:6b:f6
Fingerprint (sha256): 14:7a:6f:99:13:22:3d:30:de:de:5e:a7:7d:5b:1f:7c:56:e0:11:ec:0f:50:66:7a:02:40:fb:97:ff:97:06:49

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 fyi.cs.it-chiba.ac.jp

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for fyi.cs.it-chiba.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

fyi.cs.it-chiba.ac.jp

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kmsk.is.it-chiba.ac.jp
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idp.it-chiba.ac.jp
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ccc.is.it-chiba.ac.jp
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kmsk.is.it-chiba.ac.jp
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www.robotics.it-chiba.ac.jp
fyi.cs.it-chiba.ac.jp
www2.seki.cs.it-chiba.ac.jp
www.seki.cs.it-chiba.ac.jp
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www.lib.it-chiba.ac.jp

Certificate

The complete raw certificate details for fyi.cs.it-chiba.ac.jp in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAq48mNrDhPBpAE7ylQcru
5gtQ0VGBgf/2vWN6qPQK1rNpbSTHowcogNLvj6YSRwp+/JrnQZgY5o9geRHKnFQ3
5/59FlFq/3J+YSISDs4Rxsxka6sRa0mXGWa94CBtfxDujjtrM6qm8aNJEKHf8MsR
Cp3LnriqtYZRne5A7NudOXb78Xp4a0f6Z4eggiBc9PrxwwEA4QF4zF1qD35gMgf2
y2+kb1MxikgBlL31LWTgNSJ0RYskCn9g5f+p7IPpIIGp5bNgdA3NgnrPpGU7kzzk
xBIXDokJ0EvpSTAzNWh4RBvyOprRObyiSEnL1nYPPoHXAeABtlY+fErIqCuN1TE/
2wIDAQAB
-----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 343618426165192626051618480903394502502742
 . . . . . . . . [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 2020-03-08 14:30:15 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-06-06 14:30:15 +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 'fyi.cs.it-chiba.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 21657339686135909014790014897683131142780715258471859964915653029808089117013289619887420955740423386711751549480941131561969339173728980027232864469545491421488421616021381423820001497553470823152722094538397060772532171456982128627608094260750452427461264186352502498004333786455969467657553230251484681635500124224850885542216364726698250059222689389575232374906927603113532201442836428203293539092746610700981240783789692875225970232109899336210964889839263049246596953822689719599224916425733598811821584288389528938080210178129335526284088833071916385093879841907338321461075738026512184200921861657818429472731
 . . . . . . . . . . . . . . . . . . . . [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)
							70873cb3c15642c074a6ca2bbd57d8116a7e7628
 . . . . . . . . . . . . . . . . [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 (25 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'fyi.cs.it-chiba.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)
							00ee0075006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d91300000170bac4a87900000403004630440220578f8d24f42c54045f62ffa72707ca06295e648a4fe8e62e0488b579cace31dd02204120ba09484422fb1125b87f59616d455f0a75d0e24a14791a009abb7fa87a5e00750007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c00000170bac4a862000004030046304402202de0212839b9d7cee6eca370d4978f79c5f6a2045ae7ce7f4198b80d8d83a0fb022067a9d4e0f2da796ba289219e18e799ba4b4ad93d26ce71cc1869f83e2b987ca4
 . . . . [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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