www.medias-mediations.fr

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:4f:2b:25:a5:e5:25:0b:a5:d3:3c:8c:1f:82:93:23:a5:2c 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=www.medias-mediations.fr

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:4f:2b:25:a5:e5:25:0b:a5:d3:3c:8c:1f:82:93:23:a5:2c
Serial Number (int): 288276517065589694569562066185174542165292
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: bf:01:c9:34:50:0e:51:14:63:50:39:2b:2e:33:c6:a0:54:20:c1:50
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 3f:61:b0:3a:e2:ad:b6:17:73:39:65:bb:a7:6e:91:0e:7c:5d:42:ee
Fingerprint (sha256): 82:91:b8:9c:62:2c:e2:d1:4d:0b:4c:4a:c0:3e:b1:70:fc:3f:81:22:c9:fb:59:9f:52:c7:e7:a7:b1:fa:a9:63

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 www.medias-mediations.fr

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.medias-mediations.fr

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

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

www.medias-mediations.fr

Other certificates including the domain name medias-mediations.fr

(limited to 100 certificates)
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr
www.medias-mediations.fr

Certificate

The complete raw certificate details for www.medias-mediations.fr in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnjYy/SXXTT+Z1EeFcYqf
nI+xv8c+MaVezGH59KfD9rMSnCRLh8D0xQng4RUFMse7ETDAqjCPd8LQwHRfZ6xs
bnNBqJVhDGnDMiglAKTN+m90LVAgBwUxZt1GnBa+4QW0a3U/il2WKynMRnGXxAGD
A13+XFF0ckaLIeu4V3jfIfvjAADm0S7PtNX7By6Sc8YK12IpOGqSKHr1T1P/rcJT
lAhLwwgysJKnPfDw52PRMx77/k1ytzMv3h39Ql2igDLJczL6hBeu7/G6X8j7RQ4k
ALRbc9omEGIKUr9kphK4ETJ17ghlKF3CdFQkNXUy+5WYoYrv+8G4uNM9bZKBCTVi
3wIDAQAB
-----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 288276517065589694569562066185174542165292
 . . . . . . . . [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 2018-06-20 04:32:58 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-09-18 04:32:58 +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 'www.medias-mediations.fr'
 . . . . . . . . [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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 19972378794057122501322025897820382660613287970104985177540090213805187621593262302629839946155356173073078700036503449072316865149737898700568877047397575862291995897268050842323331461090232116881018003960656698118013343417922759818448252303193628664883043203073106945836565888558633878520220360651029628787791335755240288545184815243565357223667027350396414936986897670422880403762579659668316642069029056565038464951125254904922100184663732198306773969476486510191044653235469358015481694402526523162335173477825123988509210420486621845387499723097915952919004552017885712762285727605736900452829622729346810995423
 . . . . . . . . . . . . . . . . . . . . [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)
							bf01c934500e51146350392b2e33c6a05420c150
 . . . . . . . . . . . . . . . . [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 (28 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.medias-mediations.fr'
 . . . . . . . . . . . . . . . . [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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f1007600db74afeecb29ecb1feca3e716d2ce5b9aabb36f7847183c75d9d4f37b61fbf64000001641bae823a00000403004730450221008074e1a639aafc28fbd1e4e43f1f325eb5e1d37a7fe4edea14b345e8a834b29502202c9f79b6f04e2b42412a82dc3e93f15b5f609463eddd7235002df4305af55a23007700293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f478000001641bae824e00000403004830460221009ff8cf737a2f23ab60f264dee0d0af69db71bcb1c4b119e6e9e79cdfa933c4bf022100edd1fdca4b58009a72a082485c8e5bc985f209569cbe583abdc6953b182988bc
 . . . . [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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