mail.szu.cz

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:84:ac:2e:5f:73:c5:8e:8f:f8:81:1e:00:39:7b:97:6f:bc 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=mail.szu.cz

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:84:ac:2e:5f:73:c5:8e:8f:f8:81:1e:00:39:7b:97:6f:bc
Serial Number (int): 393595284157536653826204196217217747480508
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 23:d0:be:3b:06:16:80:5a:99:f5:80:50:75:2a:07:ef:6f:0c:27:24
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): bc:78:9c:a2:a7:86:a6:f6:73:af:a5:43:38:72:38:46:d6:02:d1:80
Fingerprint (sha256): ef:f9:56:de:18:c6:96:c5:bb:ef:df:08:5e:53:7f:64:e2:9f:1a:f4:ae:3d:2d:53:04:ef:07:f0:d5:6b:a1:dd

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 mail.szu.cz

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for mail.szu.cz

Public Key Algorithm

RSA

Key Size

3072

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

mail.szu.cz

Other certificates including the domain name szu.cz

(limited to 100 certificates)

Certificate

The complete raw certificate details for mail.szu.cz in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIFzTCCBLWgAwIBAgISBISsLl9zxY6P+IEeADl7l2+8MA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTEyMTIwMTMxMDhaFw0y
MDAzMTEwMTMxMDhaMBYxFDASBgNVBAMTC21haWwuc3p1LmN6MIIBojANBgkqhkiG
9w0BAQEFAAOCAY8AMIIBigKCAYEA8BrV/JnVGN3aEB6gx9dGhWx8fTctx9jmntoV
QsufQAYNp7W6Flj3g6+1vVwNFxYkoYxQt5I5VTYo3T6tcvTg6Wzj7CTKzu4cq99h
9D5ElI9ilUn///EcVeRBRbCAv+s3wVlAjlZEXHcdbJDXFCGHW6XWkDvZ13lurmTG
8Pzya5QHuwV+Aac0zZ2JOU5NWQHBudh0RXndKnJtLjg6xOu8KkOb0lS/hoSJOQZo
XoPzxdNHAeUrqXhId3bfmzxLojaeoHervIIup7VdFUJfuVP3cfxvZ+LlgiedD1/R
fWnRvAEh5dqcKBVA1/zzp+/L3wXgiW7QRevM5QCQp08o1euaRm8dDSUZfcIQtG1y
U2HjqQVcXvdHs4miwE+sSlRIMng9FOKC+CAWoJdTEPPudkiIIkiqS3dFaLd+LAjz
EEyBKu+IF0Et7mG+b0ZoSO/tfmuobqgD10EaDUeHs8dcPT6Wc0s32Fm8UQZd8Rpi
h6D/wcdcnts85fy4hvbXXp6toWABAgMBAAGjggJfMIICWzAOBgNVHQ8BAf8EBAMC
BaAwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAw
HQYDVR0OBBYEFCPQvjsGFoBamfWAUHUqB+9vDCckMB8GA1UdIwQYMBaAFKhKamME
fd265tE5t6ZFZe/zqOyhMG8GCCsGAQUFBwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0
cDovL29jc3AuaW50LXgzLmxldHNlbmNyeXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0
cDovL2NlcnQuaW50LXgzLmxldHNlbmNyeXB0Lm9yZy8wFgYDVR0RBA8wDYILbWFp
bC5zenUuY3owTAYDVR0gBEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAm
BggrBgEFBQcCARYaaHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEDBgorBgEE
AdZ5AgQCBIH0BIHxAO8AdgBep3P531bA57U2SH3QSeAyepGaDIShEhKEGHWWgXFF
WAAAAW738hhUAAAEAwBHMEUCIDeJz8RXoaNbqaHA9M6ppNVafqDXVKSx2pJOBjKp
v363AiEAnXXFifWugcmh3YdeYk8onWg9m7Xg4/5vqQnoOcjQZJcAdQAHt1wb5X1o
//Gwxh0jFce65ld8V5S3au68YToaadOiHAAAAW738hh4AAAEAwBGMEQCICHTFOPZ
yU+5A+QGYYp/nsWTuyZ9/bHfpcQQgFOHVTlZAiAlAtuTM56lYs26t5f2BD0lVPNV
aZGkTQYaHXTQqZGvJTANBgkqhkiG9w0BAQsFAAOCAQEAS9LC90cwaDU56P+xg1SF
p/rfizqFtt8qRI+7vDc83WX0RzxBJNXqcRhkKWwwUZE/puASZe4LiEvmg3uLSc6n
vG13cR3Qyq4AAadPa3zraWhl0eWAYLbWfZueNgsHnwN5fTrZHx6tRaTJHvOoPqel
oob1QDqDCWcvDRywzeoiLGgfjVp09Cvz14tIVOjG3jvkS7GG3aC8+1/G1Fdt84Yr
YnYRL24+ICeiMH/+/8WF7T4WVnMZKDKVAlJubMutqU1PaVnfVgjEsTQ3wOQoD7yJ
ZbCtpjE5HVc06HgL2gllpRl+X9pxnlt3qqEfBianHfTNiFqt0ewSSXXYrerhwaLw
dQ==
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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 393595284157536653826204196217217747480508
 . . . . . . . . [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 2019-12-12 01:31:08 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-11 01:31:08 +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 'mail.szu.cz'
 . . . . . . . . [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 (3184 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 5448884556237799037100171990803971674248182684103220890093102391464759152649781106865407208040831739134906506089927306952064440126162549544214174727140309578659374494358243105988269810148067775910847135196352619897581013227964053402472312283687159744000927445868758576955156098489517900903472219700864201186377900117064334549532662705132452341088187505121694324731656498113944887669553117508217227929161126952798408223884115397369404871830117723318372344103768583504429627761579837471629786931008220186205316062800961648838749069034669975005050132917565294888499085585130876959357671806037378638129558033696297208441256911539996993036043377890293890137420149446869531713387269038653074273726756532700314770745630380299083485191839799838309365513161384557661086663100622920132435943785304538879562477095099844472646785525139543316770056280150906334807406531370193978788723557176510438794954948688234043138212888995162730094593
 . . . . . . . . . . . . . . . . . . . . [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)
							23d0be3b0616805a99f58050752a07ef6f0c2724
 . . . . . . . . . . . . . . . . [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 (15 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.szu.cz'
 . . . . . . . . . . . . . . . . [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)
							00ef0076005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000016ef7f21854000004030047304502203789cfc457a1a35ba9a1c0f4cea9a4d55a7ea0d754a4b1da924e0632a9bf7eb70221009d75c589f5ae81c9a1dd875e624f289d683d9bb5e0e3fe6fa909e839c8d0649700750007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016ef7f218780000040300463044022021d314e3d9c94fb903e406618a7f9ec593bb267dfdb1dfa5c41080538755395902202502db93339ea562cdbab797f6043d2554f3556991a44d061a1d74d0a991af25
 . . . . [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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