rk.edu.pl

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:f7:b2:f8:d2:fb:d7:2b:6f:d3:fd:fc:b1:49:e4:f3:2f:2c 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)

rk.edu.pl

Let's Encrypt

Organization: Let's Encrypt
Country: US

Time since certificate expired

This certificate has expire since

Certificate Details

Serial Number (hex): 03:f7:b2:f8:d2:fb:d7:2b:6f:d3:fd:fc:b1:49:e4:f3:2f:2c
Serial Number (int): 345624496976882049424900194442796917272364
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 15:6b:0b:39:f1:52:bb:49:13:c9:78:8b:4c:0a:9e:d5:45:f8:87:9c
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 2a:9e:9b:b4:19:38:76:b6:68:7f:9d:13:f7:2f:37:9b:41:ac:96:31
Fingerprint (sha256): 00:19:09:b3:29:e5:1b:fe:7c:6e:66:57:fb:2b:b8:32:c3:9b:7f:9c:d9:0e:72:a7:b6:09:38:10:c0:02:36:3b

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 rk.edu.pl

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for rk.edu.pl


Public Key Algorithm

RSA

Key Size

4096

Signature Algorithm

SHA256 with RSA

Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Server Authentication
Client Authentication

Extensions

8 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

rk.edu.pl
www.rk.edu.pl

Certificate

The complete raw certificate details for rk.edu.pl in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIGBTCCBO2gAwIBAgISA/ey+NL71ytv0/38sUnk8y8sMA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xNjA2MDcyMDQwMDBaFw0x
NjA5MDUyMDQwMDBaMBQxEjAQBgNVBAMTCXJrLmVkdS5wbDCCAiIwDQYJKoZIhvcN
AQEBBQADggIPADCCAgoCggIBALslOFw+fhH3G5G7P0TQG3t+44G8gKAvj7IU8WsF
JvRaBipCQvIXqVEaETeIVlTDS31a01W4O5qtJBt2yrG6VsFrgEkgEth+/GKiQGYK
BRX35FdoGX/CinFo7o8k/iWTmA9egGfryanfBjp4ylxe3xtWP+CVtKabkes+/ca/
rgNiQUVtMmg4q2CJ1oaE3AbV9K/5b7UqBVU0/ZpofhHzgnQLTyVS6WKL5eGp0Vdf
1pDhpUdlmc+NagNa3/YPhR4IQ/mERkLbfEcMvrvJ4P6qXU0n1oYlNtk/JO4sbPL9
iLB2ZL9OHciNp7oOpvf1LZGg/liKYGIVxXgUwNOfBddloz1LJyEAJz2cuj7nCaYc
zxJjCTwZ5KtrK5qo22ZUDcNBFcYA1qv5Ab9ztQ4INz42YawNSYvXzcbmBRkuYPTW
p9stAk3E+spVeGx2f9/fnNbIbrjKKarZmSxSdnlz4OT3w6VzhZgR3CL8zTrUHHbf
pP3ucktnKBSvvD0heDuJpCJRuz1ZV7d6eHgJ4QBLM7VQyrfTs4DFP7G51FEn+0Zd
bLBOJ9kdz7DtqxBAnOECGd4AEBjbmzZUOYvaPIhk7PMOJGT+Yd+8Hq3f69nqo17n
HIwhdAT2r+Sv5zaOAM5A+xe3Jct/nCjRpvP5gvhZubkA/pnpyHuMaoHUexKVPUMa
GONBAgMBAAGjggIZMIICFTAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYB
BQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFBVrCznxUrtJ
E8l4i0wKntVF+IecMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMHAG
CCsGAQUFBwEBBGQwYjAvBggrBgEFBQcwAYYjaHR0cDovL29jc3AuaW50LXgzLmxl
dHNlbmNyeXB0Lm9yZy8wLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14My5s
ZXRzZW5jcnlwdC5vcmcvMCMGA1UdEQQcMBqCCXJrLmVkdS5wbIINd3d3LnJrLmVk
dS5wbDCB/gYDVR0gBIH2MIHzMAgGBmeBDAECATCB5gYLKwYBBAGC3xMBAQEwgdYw
JgYIKwYBBQUHAgEWGmh0dHA6Ly9jcHMubGV0c2VuY3J5cHQub3JnMIGrBggrBgEF
BQcCAjCBngyBm1RoaXMgQ2VydGlmaWNhdGUgbWF5IG9ubHkgYmUgcmVsaWVkIHVw
b24gYnkgUmVseWluZyBQYXJ0aWVzIGFuZCBvbmx5IGluIGFjY29yZGFuY2Ugd2l0
aCB0aGUgQ2VydGlmaWNhdGUgUG9saWN5IGZvdW5kIGF0IGh0dHBzOi8vbGV0c2Vu
Y3J5cHQub3JnL3JlcG9zaXRvcnkvMA0GCSqGSIb3DQEBCwUAA4IBAQArlaro4zLQ
vn/6DafhCPLEdShDEDGKZU7FmPQEZD+J34me/xE9ZlNCHQbz7dBgHzWdj3zgb8ni
gQcjBUlaEhHBDXd8La7ufD2pIJDNJ5NHJO6CWi7kZF7VW1LZO9BOljvbVqT8wQ55
Dc6EpvXu9tBWPsi2tmhPo6uxl6ZCa76IC3IHpG84Akvf5VlGNEPnO1P0GGTO6Snx
7iY1lBhXTx2OZXWXXp8G4TLvW/ZoNGtO0Sv/lVuevI9xkzhMm7TJ2QIpyUUqkz3E
aPnAmbQYenU+5xKiT+46iTSQyLR0/6/udktdHZuh9DXH0gweV4+4S/eRq5JwTHhp
J+enYDszUqau
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAuyU4XD5+Efcbkbs/RNAb
e37jgbyAoC+PshTxawUm9FoGKkJC8hepURoRN4hWVMNLfVrTVbg7mq0kG3bKsbpW
wWuASSAS2H78YqJAZgoFFffkV2gZf8KKcWjujyT+JZOYD16AZ+vJqd8GOnjKXF7f
G1Y/4JW0ppuR6z79xr+uA2JBRW0yaDirYInWhoTcBtX0r/lvtSoFVTT9mmh+EfOC
dAtPJVLpYovl4anRV1/WkOGlR2WZz41qA1rf9g+FHghD+YRGQtt8Rwy+u8ng/qpd
TSfWhiU22T8k7ixs8v2IsHZkv04dyI2nug6m9/UtkaD+WIpgYhXFeBTA058F12Wj
PUsnIQAnPZy6PucJphzPEmMJPBnkq2srmqjbZlQNw0EVxgDWq/kBv3O1Dgg3PjZh
rA1Ji9fNxuYFGS5g9Nan2y0CTcT6ylV4bHZ/39+c1shuuMopqtmZLFJ2eXPg5PfD
pXOFmBHcIvzNOtQcdt+k/e5yS2coFK+8PSF4O4mkIlG7PVlXt3p4eAnhAEsztVDK
t9OzgMU/sbnUUSf7Rl1ssE4n2R3PsO2rEECc4QIZ3gAQGNubNlQ5i9o8iGTs8w4k
ZP5h37werd/r2eqjXuccjCF0BPav5K/nNo4AzkD7F7cly3+cKNGm8/mC+Fm5uQD+
menIe4xqgdR7EpU9QxoY40ECAwEAAQ==
-----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 345624496976882049424900194442796917272364
 . . . . . . . . [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 2016-06-07 20:40:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2016-09-05 20:40:00 +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 'rk.edu.pl'
 . . . . . . . . [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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 763486585231060821774516589325396336310019067685396132394711219795606045305867609428938013108075493757442557608828634081976429573246440316621158976165573587869878867976287004760502681000421122610879482753609253547828059547684795925964028885785392047371178824856569498869214465386751850003624714019321855212186111170872091882497171529310264354735534116626900559249849025564996440931469383180189428656184370039920679481606903201670163590598592738552464589521769645830963109991015814301036972840393373227232067462765420552691613889302898909557814997614286403216720722058650641455983114293919364909078294701401601570999518986209254664796150135987332542537785033799798607675865381634951057744970088570317464872513377250437900504707514406353341963003417485537642465359579581353794617122139926779389270798784959186773933944924818432351402820962913706638383863542249969960252359972380427374888415728554915726245917116972050846414854021329231055545612190737681979540459097337774353260294699200279278150642664517523172887288712483535809625559641749971415136368089568998875148500935883709019958807873039907186496946447368124849656794170059724082882307226332384373637772307259123652635724520194489725965885401427471233475599707274372738352472897
 . . . . . . . . . . . . . . . . . . . . [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)
							156b0b39f152bb4913c9788b4c0a9ed545f8879c
 . . . . . . . . . . . . . . . . [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 (100 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 (28 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'rk.edu.pl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.rk.edu.pl'
 . . . . . . . . . . . . . . . . [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 (246 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 1.3.6.1.5.5.7.2.2 (unotice)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/'
 . . . . [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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