mail.szu.cz

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:7d:75:91:0f:00:6a:11:55:f8:a1:bb:22:6b:f3:24:d6:26 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): 04:7d:75:91:0f:00:6a:11:55:f8:a1:bb:22:6b:f3:24:d6:26
Serial Number (int): 391140712454978587650095956192819377657382
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 23:39:69:4f:48:16:03:42:a5:68:d3:32:95:2c:46:01:0d:05:7c:e5
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): da:8a:40:fe:87:64:24:01:2d:51:99:3b:d2:02:eb:04:1d:68:9c:9f
Fingerprint (sha256): fe:86:2f:ea:03:3b:0d:c4:cf:9a:4b:34:8c:5b:e4:30:9d:95:6a:19:0b:d9:00:0a:0c:98:0c:eb:29:f8:94:fc

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-----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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 391140712454978587650095956192819377657382
 . . . . . . . . [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 2019-01-26 12:10:22 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-04-26 12:10:22 +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 4702706374761384086727371885546857429092207916183005010373381796541315469756318529990215464502351216706074243075301705385166013724865029946721705375725799799622060580442470225397157478518181481365024444946966062253063743112520393407347791945928599400367855072463187947384016359720346502987292365445807610007159538246365882240780950136352162588646751660532359886153660337304952527332412480647722274062639874321465287034880387470422114810132548991908053352853351815374414149556321083678120146206645674803844928222800812541318671279859222023797122168866561277159938062637363359558627558406925109420930694783204441881203201614973371600415740952670358355692102547655656731065394177355379843630355105309976547136004285453408291832155887858669578570057668706408686480221704377679339566160266346020484769640800243344079571228035699516176026086565211135996790236839376829621902540975248651892290973495488988929128971747091955814386083
 . . . . . . . . . . . . . . . . . . . . [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)
							2339694f48160342a568d332952c46010d057ce5
 . . . . . . . . . . . . . . . . [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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f1007700747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc56000001688a4853e20000040300483046022100a805ede634d0041d336dde2e8d79f12b9481172c8edb8c9ead8bfb6ccb60d5930221009906e3e4cfca97ac22893e08cdf1a4398cd49c0d7d424ac707b504372345782d00760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d000001688a4853de0000040300473045022100bd2e1609e622bef737dee51ad6d7e04c6c80282a36cd1f38e0855108451317c702205224f64cae26b03c35240df98eb8684d3a75c841d0da16ca998dfdf3a3c6ad41
 . . . . [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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