DV SSL/TLS Certificate for centralstudies.gr

Certificate is witin its validity period

Issued by Let's Encrypt (R11)

About the centralstudies.gr DV SSL/TLS Certificate

This certificate with serial number 05:a3:c5:13:7a:2e:c7:3c:b7:ab:ca:7e:b7:6b:46:25:a1:43 for centralstudies.gr was issued on by Let's Encrypt.

With 2 subject alternative names, this certificate can be used to secure multiple FQDNs. This DV SSL/TLS Certificate is currently within its validity period but we haven't checked the revocation status of this certificate, you can do this simply on revocationcheck.com. We have found some issues with the compliance of this certificate, they are be shown below. We hope this DV SSL/TLS Certificate review for centralstudies.gr provides you with the detailed information you were looking for.


We have identified some issues with this certificate:
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Let's Encrypt

Organization: Let's Encrypt
Country: US

This X.509 certificate will expire on

Certificate Details

Serial Number (hex): 05:a3:c5:13:7a:2e:c7:3c:b7:ab:ca:7e:b7:6b:46:25:a1:43
Serial Number (int): 491289414513884271407362177294904905277763
Serial Number Length: 139 bits, 18 octets

Subject Key Identifier: 45:f1:cc:26:37:8d:07:79:be:62:66:5f:9f:ce:ee:6f:ed:ca:19:8e
Authority Key Identifier: c5:cf:46:a4:ea:f4:c3:c0:7a:6c:95:c4:2d:b0:5e:92:2f:26:e3:b9

Fingerprint (SHA-1): 5a:1d:07:65:f6:3f:03:1f:7f:44:f3:ae:ae:8e:e3:d2:78:f7:2a:c0
Fingerprint (SHA-256): 0c:76:f9:51:5c:73:e4:a9:0b:9e:be:34:77:9c:3b:d7:1b:6a:9a:3d:de:6e:c0:12:06:89:92:90:59:f7:b9:18

Issuing Certificate URL: http://r11.i.lencr.org/

Revocation Information

CRL Distribution Point: http://r11.c.lencr.org/68.crl

Check the revocation status for certificate centralstudies.gr
2
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details of the X.509 certificate for centralstudies.gr

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
10
CA Certificate
This is not a CA certificate

Subject Alternative Names

X.509 Certificate

The complete raw X.509 certificate details for centralstudies.gr in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArh+wvpDmbJqNe50WUxpw
YMZduVE0RoZ/7iyUjaFgZ5DkTed2hJ5YZd0r0pyUTJZrStuwT1DhcNIOEXbY64Oa
4lIynF3id5scC0cp2yda6dvBAZX8RYPNCuVBu6GXWdHVlDQu4vxlKTDnWp9WL4YO
QYAv5qEn7+Nr+KpXcfmaBVJcCpZv4VmkbQyT5um6wKJ8u8wO0IMTM9sgDwiuDrec
EkJTnZA3VifNHYQGNIV+3Y6zwhfvygxykFVvjT7K0a1oHsxo78EmtBFzzqrMSSdu
WUoGBaTyKigeNxzlnWoj8kT9aWumK6onbaDAo/ctvNCQcXiNCdTpvRGIz70yEQV4
NQIDAQAB
-----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 491289414513884271407362177294904905277763
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'R11'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-07-06 11:49:40 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-10-04 11:49:39 +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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'centralstudies.gr'
 . . . . . . . . [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
 . . . . . . . . . . . . . . . . [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 21981092186614487204662548612394120654196512577573280242173419286453054511282289535347975058481240110392591390862356316911985330380775595356811934577431539094199444680296194995350869454971210597301667880013476365650906354154171332022034096444942814536367587526617581147396055147697360415529858037975894688625657209501954000415813889085245201224853447516841709191137729579060262477584009336536367220075396956718258894206329170178379280081396260758402171342629907498516751983473595793520089042056949937359034051953635029650774403945274627948915816874778632339245380789603596191650681726965597163352478441000265270523957
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							45f1cc26378d0779be62665f9fceee6fedca198e
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName c5cf46a4eaf4c3c07a6c95c42db05e922f26e3b9
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r11.i.lencr.org/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (42 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '*.centralstudies.gr'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'centralstudies.gr'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (12 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
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.31
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r11.c.lencr.org/68.crl'
 . . . . . . . . . . . . . . . . [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)
							00f1007700ed3c4bd6e806c2a4a20057dbcb24e23801df512fedc486c5700f20ddb73e3fe000000197dfc79d850000040300483046022100b5bc9a8e4d591537c84e6781de310181c8a78951dbb0c33518e4716a1b8a197b02210088361cca625842633175d8d711080fe043650f1a97b8e7e5394aac6ae6a5854e00760012f14e34bd53724c840619c38f3f7a13f8e7b56287889c6d300584ebe586263a00000197dfc7a5550000040300473045022100e15abcb60d8681406a790099ab1be316e4e7cd43fa27a7ac16077e78df14140f02201a68635067de3f1958cda60a12bcb664d1978b27dd65e4a7ab2deb02b4262b1d
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . [c:0|t:5|false] NULL []
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		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