blog.ocw.u-tokyo.ac.jp

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:fb:1f:fd:77:63:26:b4:57:d9:c0:7a:4a:40:67:9a:22:6e 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=blog.ocw.u-tokyo.ac.jp

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:fb:1f:fd:77:63:26:b4:57:d9:c0:7a:4a:40:67:9a:22:6e
Serial Number (int): 346790254032873145347973149778055557423726
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: fc:c3:fb:47:55:67:14:7f:06:f8:04:5a:cf:f6:90:d6:ef:b9:e0:8e
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): bb:b4:38:80:a4:f7:07:e7:02:d4:df:84:2b:50:c1:19:ce:d6:10:4e
Fingerprint (sha256): 03:98:86:c1:a6:e6:48:ac:1c:e6:f9:d7:47:cc:1d:8c:f7:08:ea:08:a2:d7:4b:51:18:99:22:35:2e:ac:9c:f0

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 blog.ocw.u-tokyo.ac.jp

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for blog.ocw.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

blog.ocw.u-tokyo.ac.jp

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Certificate

The complete raw certificate details for blog.ocw.u-tokyo.ac.jp in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIFYzCCBEugAwIBAgISA/sf/XdjJrRX2cB6SkBnmiJuMA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xODEyMzEwNDE2MzBaFw0x
OTAzMzEwNDE2MzBaMCExHzAdBgNVBAMTFmJsb2cub2N3LnUtdG9reW8uYWMuanAw
ggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDBx1YHLcpm6oQ6vEWMDzl/
WSDAQhl29BKgWQsz/9yv/ZVtltVx6aP1GaLQe656wFjU9pKCQ3wWcQ8wUi06HEDr
KehYY8ZkmC7fjPGXeYSvbvQzZeF4Lq3gsLWbuhlDHyvXUABEs/pJqyXM5oRcD2+7
nfC+ymCxs+HNGXYpZzB+DAx+ykfQYWzaESZ4ZgdlKy/FimsT2cjFAcD69dvJF0fr
BeZuooOoBYX58C1JMc9n5IXYBe3FgAyhI4thPlt4BzJtj5T2s1BfNAkhG+UfstYs
zwaH1xk7C/oembGYaIYLLXnpf3bzMD73SSrB5N0orcj5rHhn+p1uQBNM9er222ix
AgMBAAGjggJqMIICZjAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUH
AwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFPzD+0dVZxR/BvgE
Ws/2kNbvueCOMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8GCCsG
AQUFBwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxldHNl
bmNyeXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxldHNl
bmNyeXB0Lm9yZy8wIQYDVR0RBBowGIIWYmxvZy5vY3cudS10b2t5by5hYy5qcDBM
BgNVHSAERTBDMAgGBmeBDAECATA3BgsrBgEEAYLfEwEBATAoMCYGCCsGAQUFBwIB
FhpodHRwOi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCCAQMGCisGAQQB1nkCBAIEgfQE
gfEA7wB2AOJpS64m6OlACeiGG7Y7g9Q+5/50iPukjyiTAZ3d8dv+AAABaAKxJp4A
AAQDAEcwRQIhAPOX6CNQMTA3Cvs/5vp+kRtVZ94Xm8GncFAX4qtJFnnjAiBt3Djl
TS9mtO0DYgWBdBQ9TuH2hVjvS8lUp60bkf6qAwB1AGPy283oO8wszwtyhCdXazOk
jWF3j711pjixx2hUS9iNAAABaAKxJp4AAAQDAEYwRAIgPyw4N8/Cf4ilaFWTfBbX
KAWDlSYp8ekHR/OGvTy5NRcCIE+Q4hQ+j/FXr9Nd0KfKmCKf3FQPOoHclwqZUkKC
VCVgMA0GCSqGSIb3DQEBCwUAA4IBAQAf1VzfYoyH0P7Mexef19qGvpVSMqsTiz5/
mjN7oQlMT1yoktYxxO9V4+j0O2MqFgcB/QD4v9P5T+/euZle6GIAwfIN9EN1nY6W
3EGAHIQEwg6lgBcsUbTVsO9yzUr4gtXOQScQXKD5nBONdggiKq8EnkGK/JF89v2o
z6jKUDUVtlas7G/quJfDVwekguzH/uGAAuTpkasizxSaZ6B2em/jNQzmX95CixOq
A8RgHazn9p3+0YVIAEVIi1sS4QEnaUwdM4tvU++Map5TXqV8S3AkcKJElyXDYIHT
S0BZtIrCSS1LsP4cRMePYI1cgqNWwEmeDyZ8ls+N0rR7dlrZsSF0
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwcdWBy3KZuqEOrxFjA85
f1kgwEIZdvQSoFkLM//cr/2VbZbVcemj9Rmi0HuuesBY1PaSgkN8FnEPMFItOhxA
6ynoWGPGZJgu34zxl3mEr270M2XheC6t4LC1m7oZQx8r11AARLP6SaslzOaEXA9v
u53wvspgsbPhzRl2KWcwfgwMfspH0GFs2hEmeGYHZSsvxYprE9nIxQHA+vXbyRdH
6wXmbqKDqAWF+fAtSTHPZ+SF2AXtxYAMoSOLYT5beAcybY+U9rNQXzQJIRvlH7LW
LM8Gh9cZOwv6HpmxmGiGCy156X928zA+90kqweTdKK3I+ax4Z/qdbkATTPXq9tto
sQIDAQAB
-----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 346790254032873145347973149778055557423726
 . . . . . . . . [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 2018-12-31 04:16:30 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-03-31 04:16:30 +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 'blog.ocw.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 24462289126797253238075929488288814278285050963642737199137693726640635194480702720852096979940133257680294065896696750192290440979216125314386863095329734638406963719688603524771883133178825384852207386018262103469777182859027625293833707526559134340762635474288567880515637160645680367935728028450474447747312855302143758810870108526907078523000761762742693265603295838170980985368899994820376105678008853525324689174205415015045424480106857406178517482581367306464149129263009236481566413322167776219361369238117684169076149983103566828839756452270465065181087872189217002265011001757369177150407406585498956425393
 . . . . . . . . . . . . . . . . . . . . [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)
							fcc3fb475567147f06f8045acff690d6efb9e08e
 . . . . . . . . . . . . . . . . [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 (26 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'blog.ocw.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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016802b1269e0000040300473045022100f397e823503130370afb3fe6fa7e911b5567de179bc1a7705017e2ab491679e302206ddc38e54d2f66b4ed0362058174143d4ee1f68558ef4bc954a7ad1b91feaa0300750063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016802b1269e000004030046304402203f2c3837cfc27f88a56855937c16d7280583952629f1e90747f386bd3cb9351702204f90e2143e8ff157afd35dd0a7ca98229fdc540f3a81dc970a99524282542560
 . . . . [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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