lc.cyut.edu.tw
Issued by R3
About this certificate
This digital certificate with serial number 03:8b:28:6b:06:ac:32:c9:fc:62:b0:13:b4:f9:8a:b3:ed:d0 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=lc.cyut.edu.tw
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:8b:28:6b:06:ac:32:c9:fc:62:b0:13:b4:f9:8a:b3:ed:d0Serial Number (int): 308689831628223866233554294675738859924944
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 88:18:75:e7:9e:d5:50:1f:25:04:b9:5b:72:ca:b6:dd:7d:5e:86:c6
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): 26:4d:67:6d:18:46:ef:4e:9d:b6:28:03:7e:88:59:e5:76:df:f7:76
Fingerprint (sha256): 2c:19:a0:52:b3:99:fb:33:2f:d3:ec:af:44:d2:ed:40:6d:6e:51:fa:84:f5:1b:e6:47:27:96:95:be:1d:87:fe
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.orgCheck the revocation status for certificate lc.cyut.edu.tw
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for lc.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
9 extensions
No
unhandled critical extensions
CA Certificate
This is not a CA certificate
Subject Alternative Names
lc.cyut.edu.tw
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Certificate
The complete raw certificate details for lc.cyut.edu.tw in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFIzCCBAugAwIBAgISA4soawasMsn8YrATtPmKs+3QMA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzA0MTcxODMwNTNaFw0yMzA3MTYxODMwNTJaMBkxFzAVBgNVBAMT DmxjLmN5dXQuZWR1LnR3MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA lpt3g87eoHPI1ttRltP+qAHGjFDXmK8FwyZzL80SdPoUo22QEbye5YG8CazhSECe caQ5Ys6t56aNEyg8v4LFEc0vOIdPcpBzZkfXYmMEJkm418PD1h62d044SdUmbkmt yh6CROsQKxW7KO1BZMj9ker1J623/VVy+F7e9eqbuPY8OSnflkuFI4EaFHCjreJ3 ws3aGAjfLIidCH8OCct9ORJkcrgyGWXr4rZywf5Z3z5WiaC62DUo3ij3KdLCMFXY DO43i4EjCrPGr6ArapNA6VCHlul8z4IeEcJLPPB3WlQhpWsfPDvlIEqmCU4/jvx3 ZjW4rWZCbjiU/+54SB71zQIDAQABo4ICSjCCAkYwDgYDVR0PAQH/BAQDAgWgMB0G A1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1Ud DgQWBBSIGHXnntVQHyUEuVtyyrbdfV6GxjAfBgNVHSMEGDAWgBQULrMXt1hWy65Q CUDmH6+dixTCxjBVBggrBgEFBQcBAQRJMEcwIQYIKwYBBQUHMAGGFWh0dHA6Ly9y My5vLmxlbmNyLm9yZzAiBggrBgEFBQcwAoYWaHR0cDovL3IzLmkubGVuY3Iub3Jn LzAZBgNVHREEEjAQgg5sYy5jeXV0LmVkdS50dzBMBgNVHSAERTBDMAgGBmeBDAEC ATA3BgsrBgEEAYLfEwEBATAoMCYGCCsGAQUFBwIBFhpodHRwOi8vY3BzLmxldHNl bmNyeXB0Lm9yZzCCAQUGCisGAQQB1nkCBAIEgfYEgfMA8QB2ALc++yTfnE26dfI5 xbpY9Gxd/ELPep81xJ4dCYEl7bSZAAABh5Cy2wcAAAQDAEcwRQIhALc/6SO3WMfy 0f2AzdNy2+ZPWUeXkj6BcUYtOIsCNluPAiBtCqxDYPC1qPDBUXxE5okVABaHGbfa 8Jal/J/A8U3RfgB3AK33vvp8/xDIi509nB4+GGq0Zyldz7EMJMqFhjTr3IKKAAAB h5Cy2y0AAAQDAEgwRgIhAKtgz28F4X4kt56xFgd6uvixUwFNdp0cIDuwTqJJF7Hj AiEAhmViJT4WPTepiYq5S59rLrfWh+5o47dQrLpHlDa5kSowDQYJKoZIhvcNAQEL BQADggEBAJzuiW/EBZ0HKTdsXc+Up9hXRgcJinQzhIc+4CG/nGs+6KlUa9QVcvLh JAfjs7VT371djhb9djN5Ihv6saPl8RwL19hlRhrhXh0uSQd5YXZpTFFXLM1WTdHb K7ZIgAY4djwhUy/JWBNeP5SSh8U7IiRPHWF2PVTxmaZzkmVcap9eOSsic7XuMkJ5 pknwYI6REtUSH1T0gAUCbvQs4wP0U3WuPSZt/LkNBB11IO6Oj+dq4sRo6ri/rQ8p bkdoROsKNslX5G8O0uBuuzjGRGYMD0q7VgvAEW5bsATu4vetStgOyb7mJ/nKKafl j8yk9KqhKesGBrVoPj1O6E4jDmq9Or4= -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAlpt3g87eoHPI1ttRltP+ qAHGjFDXmK8FwyZzL80SdPoUo22QEbye5YG8CazhSECecaQ5Ys6t56aNEyg8v4LF Ec0vOIdPcpBzZkfXYmMEJkm418PD1h62d044SdUmbkmtyh6CROsQKxW7KO1BZMj9 ker1J623/VVy+F7e9eqbuPY8OSnflkuFI4EaFHCjreJ3ws3aGAjfLIidCH8OCct9 ORJkcrgyGWXr4rZywf5Z3z5WiaC62DUo3ij3KdLCMFXYDO43i4EjCrPGr6ArapNA 6VCHlul8z4IeEcJLPPB3WlQhpWsfPDvlIEqmCU4/jvx3ZjW4rWZCbjiU/+54SB71 zQIDAQAB -----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 308689831628223866233554294675738859924944 . . . . . . . . [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 2023-04-17 18:30:53 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-07-16 18:30:52 +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 'lc.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 19012409308390438731259342928245273946327781609971307488781949282645761148822279138836226451040271790078364088047275368644607684430183175406567742851146278667570375779846152385936502497761671012290359279140851010111525533261561856183065528629581656915872156821072520854016672944811472195749421167809381353198768105298330378708734001998716882127624777388654602982123356186277140372496084528240777047178366296048878471506687413903346368607092682531897829906822445743662542998951459318341501322709330818983009332529626778125826949913087294596418506003517954679382993613258524138906254859286012311921740946892402414515661 . . . . . . . . . . . . . . . . . . . . [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) 881875e79ed5501f2504b95b72cab6dd7d5e86c6 . . . . . . . . . . . . . . . . [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 (18 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'lc.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 (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 (246 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes) 00f1007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb4990000018790b2db070000040300473045022100b73fe923b758c7f2d1fd80cdd372dbe64f594797923e8171462d388b02365b8f02206d0aac4360f0b5a8f0c1517c44e6891500168719b7daf096a5fc9fc0f14dd17e007700adf7befa7cff10c88b9d3d9c1e3e186ab467295dcfb10c24ca858634ebdc828a0000018790b2db2d0000040300483046022100ab60cf6f05e17e24b79eb116077abaf8b153014d769d1c203bb04ea24917b1e3022100866562253e163d37a9898ab94b9f6b2eb7d687ee68e3b750acba479436b9912a . . . . [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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