mail.szu.cz

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:62:8e:a2:dc:ba:f0:40:5a:1d:ad:30:ee:a7:ab:de:f2:c6 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): 03:62:8e:a2:dc:ba:f0:40:5a:1d:ad:30:ee:a7:ab:de:f2:c6
Serial Number (int): 294874125757966155285501229565809000379078
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 55:a7:23:5b:a3:3b:ba:b3:e6:5c:66:1e:fa:a7:57:29:27:6c:5d:e6
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 86:91:76:6c:a9:d9:c3:b4:aa:6c:fa:d6:00:9c:87:7e:96:7c:61:e9
Fingerprint (sha256): 02:8c:09:d7:9d:e6:18:b7:cc:23:78:34:af:61:f9:9f:fe:c9:af:8e:bf:98:71:fb:1e:43:db:4a:2a:df:75:4e

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-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBojANBgkqhkiG9w0BAQEFAAOCAY8AMIIBigKCAYEA0mz88sDwwk/kVdavR5tm
hE3Sjmm4/QXJnH77IK7nxW420mcN/9dp47F/eP2s2aMDHk8QUU5luE1MZCoaGH6v
M7SPDCrMJMHj24RvGCEXJIaX/6F2OAiT0YX/sMKthODY5ZlpISJOyt1Ayigz1N/+
wH9UnBGrrvXPMrpyJ+do2TegiYZNPNWrdjUF/BfWXmi951SAlCG1fTkMdBUsYvdq
ASOESIMstKFojXjfBE5bo2JYA06lSwKEitG+jhM5Tq5hMWqWsnwhi/DBMoLcNr63
3yvz0yYQPDu0tY8YUumm53+R2HGh1wTwcKgV6+1gHAxdoD28B0XaAg/r1hKKsQNA
PZSLOB71vvDYP2Il5f5d0PM8uuj7rEORtwpJr+N+Il1FIkNnM20pMzdZ0VaLxB5Y
qLvsu4+RpUjbqETMPYs9cSsJpYuGQ1RhbkD1R6PIt+8/JAxHuDozBJU5biSkIJFU
bhTQWsX37QAoINTVn0tF9rJ2Q2FiCMgvoQxmqJvi1REzAgMBAAE=
-----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 294874125757966155285501229565809000379078
 . . . . . . . . [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 2020-02-29 23:40:37 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-05-29 23:40:37 +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 4775353944534448346360148910851534277313600345692173297790873775792674117845549293933712598170929730016996387736703660751146282068952213124218166541247299544400957504838871323312513135724419212332750333511881223109765740025324194229178825536359465390658061957011420249379949458771930960982292864433659943732014274744267832487178897220685936469635912430905515009550849348439742265213631467925491223951740150734519683235251870748623491384351430464344054458292452804503266721143427593216640288863841576380615345048750559693020747811402022246432963072878349183824747217188435300288665104902001685592884606649945872218447836151962426731621628264655938862290879023842998888994290437507995821252206533127581337768224640261589111096834765677209552668001699819468805513597738499630831820137826995251700328255522517925002646681177814294780399535397315581422990173172810505864240746816845774333709261807288187621338275596860627694719283
 . . . . . . . . . . . . . . . . . . . . [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)
							55a7235ba33bbab3e65c661efaa75729276c5de6
 . . . . . . . . . . . . . . . . [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)
							00ef00750007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c000001709389ab2e000004030046304402204cae80a0493620839f58d983f589d62ce79e221002ca6da6a8807ec734d3d5e20220759b5f472e16ce64a4908a502801fe364b57d0caaad069169d24bec56aef31050076006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d913000001709389abae0000040300473045022024a11046a6bbb0734521e89cbd87b2e82964d5de5b468f359b7b9aec28d490b8022100d0d19d020a888e3dffe6b0fb7d1a49ef125a38cb2f047513b3531fa6a00d161b
 . . . . [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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