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What Is PKI (Public-Key Infrastructure)
What is PKI (Public-Key Infrastructure)? Public-Key Infrastructure (PKI) is a public-key cryptography system that enables users to securely communicate on an insecure public network, and reliably verify the identity of a user via digital signatures. The main function of the a PKI system is for the c...
2012-07-25, 2795👍, 0💬

OpenSSL "verify -CAfile" - Specify Root CA Certificate
How to specify the root CA certificates that close the signing chain for the server certificate for OpenSSl "verify" command? I have downloaded the root CA certificate in a file. If you have the root CA certificate downloaded in a file, you can provide it to the OpenSSL "verify" command using the "-...
2012-07-24, 6353👍, 0💬

OpenSSL "verify -untrusted" - Specify Untrusted Certificate
How to specify those intermediate CA certificates that form the signing chain for the server certificate for OpenSSl "verify" command? I have the certificate chain from the server saved in a file. If you have the server certificate chain saved in a file, you can provide it to the OpenSSL "verify" co...
2012-07-24, 5998👍, 0💬

OpenSSL "verify" - Verify or Validate Certificate
How to verify or validate a certificate using OpenSSL "verify" command? I got a certificate from the Web site server and want to see if it is valid. If you have a certificate stored in a file, you can try to validate it or verify it with the OpenSSL "verify" command as shown below: C:\Users\fyicente...
2012-07-24, 5984👍, 0💬

Download Root CA Certificate
How to download the certificate from a root CA? I need to the root CA certificate to close the certification validation chain. If you know the CN (Common Name) of the root CA, for example "DigiCert High Assurance EV Root CA", you can search and download it our certificate database at certificate.fyi...
2012-07-24, 5484👍, 0💬

What Is Java Keystore File
What is a Java Keystore file? I heard that it used to provide CA certificates to Java applications. A Java Keystore file is a specially formatted file used to store cryptographic keys and certificates. A Java KeyStore file can be used to store 3 types of entries: 1. PrivateKeyEntry - This type of en...
2012-07-24, 4108👍, 0💬

OpenSSL Verify Operation Steps
How does the OpenSSL verify operation work? What are the steps used by OpenSSL to verify a certificate? The OpenSSL verify operation uses the same functions as the internal SSL and S/MIME verification, therefore this description applies to these verify operations too. There is one crucial difference...
2012-07-24, 3514👍, 0💬

Example of X.509 Certificate Data Structure
Can you show me an example of X.509 certificate data structure? Here is an example of X.509 Version 3 certificate data structure: Certificate: Data: Version: 3 (0x2) Serial Number: 1 (0x1) Signature Algorithm: md5WithRSAEncryption Issuer: C=ZA, ST=Western Cape, L=Cape Town, O=Thawte Consulting cc, O...
2012-07-24, 2995👍, 0💬

What Is the Structure of Certificates
What is the structure of certificates? What types of values are recorded in a certificate? The structure of an X.509 Version 3 certificate is defined in RFC 5280 - "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile". It contains the following values: ...
2012-07-24, 2718👍, 0💬

Save OpenSSL Command Output to File
How to save the output of an OpenSSL command into a file? I want to make a copy of the server certificate display in the "s_client -connect" command output. If want to save the output an OpenSSL command into a file, you need to run the entire OpenSSL command at the Windows command prompt with the Wi...
2012-07-24, 10909👍, 0💬

OpenSSL "s_client -connect" - Show Server Certificate Chain
How to show all certificates in the server certificate chain using the OpenSSL "s_client -connect" command? I know the server uses multiple intermediate CA certificates. You can get all certificates in the server certificate chain if use "s_client -connect" with the "-showcerts" option as shown belo...
2012-07-24, 8301👍, 0💬

OpenSSL "s_client -connect" - Connect to HTTPS Web Site
How to connect to a HTTPS Web site using OpenSSL? I see the Web sites using the "https:\" format. If you see a Web sites using the "https:\" format, for example https://twitter.com/login/, you can try to connect the Web site using the "x509 -connect" command as shown below: C:\Users\fyicenter&gt...
2012-07-24, 8105👍, 0💬

OpenSSL "s_client -connect" - View Server Certificate
How to view the server certificate using the OpenSSL "s_client -connect" command? You can get the server certificate, if use "s_client -connect" without the "-quiet" option as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; s_client -connect www.twitter.com:443 CONN...
2012-07-24, 5407👍, 0💬

OpenSSL "verify" Command Options
What can I use OpenSSL "verify" command for? What are options supported by the "verify" command? OpenSSL "verify" command is a utility to verify certificates. Here are options supported by the "verify" command: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; verify -h usage: ver...
2012-07-24, 3879👍, 0💬

Go Daddy Secure Certification Authority Certificate - FDAC6132936C45D6E2EE855F9ABAE7769968CCE7
Certificate Summary: Subject: Go Daddy Secure Certification Authority Issuer: Go Daddy Class 2 Certification Authority Expiration: 2026-11-16 01:54:37 UTC Key Identifier: FD:AC:61:32:93:6C:45:D6:E2:EE: 85:5F:9A:BA:E7:76:99:68:CC:E7Received at FYIcenter.com on: 2016-10-29 Go Daddy Secure Certificatio...
2012-07-23, 9537👍, 0💬

Yandex Passport Certificate - 74D389BE8FA210A1EF92BF8759FB1B3C774A202A
Certificate Summary: Subject: Yandex Passport Issuer: YandexExternalCA Expiration: 2014-01-17 15:15:46 UTC Key Identifier: 74:D3:89:BE:8F:A2:10:A1:EF:92: BF:87:59:FB:1B:3C:77:4A:20:2AReceived at FYIcenter.com on: 2016-10-29 Yandex Passport Certificate - 74D389BE8FA210A1EF92BF8759FB1B 3C774A202ACerti...
2012-07-23, 7895👍, 0💬

DigiCert High Assurance CA-3, www.digicert.com, DigiCert Inc, US
Certificate summary - Owner: DigiCert High Assurance CA-3, www.digicert.com, DigiCert Inc, US Issuer: DigiCert High Assurance EV Root CA, www.digicert.com, DigiCert Inc, US Expiration: Sat Apr 02 20:00:00 EDT 2022 MD5: C6:8B:99:30:C8:57:8D:41:6F:8C: 09:4E:6A:DB:0C:90Hash: Owner Hash=1445ed77, Issuer...
2012-07-23, 4567👍, 0💬

YandexExternalCA, Dld, Dyandex, Dru
Certificate summary - Owner: YandexExternalCA, Dld, Dyandex, Dru Issuer: GTE CyberTrust Global Root, "GTE CyberTrust Solutions, Inc.", GTE Corporation, US Expiration: Fri Jan 17 10:15:46 EST 2014 MD5: 9C:D4:8D:93:33:2D:1B:5D:0F:7B: 35:4C:1F:FC:78:C8Hash: Owner Hash=98ae5019, Issuer Hash=4d654d1d Inf...
2012-07-23, 4363👍, 0💬

reg.163.com, Terms of use at www.verisign.com/rpa (c)05, Tech...
Certificate summary - Owner: reg.163.com, Terms of use at www.verisign.com/rpa (c)05, Technical General Support, "Netease.com,Inc", L=Beijing, ST=Beijing, CN Issuer: VeriSign Class 3 International Server CA - G3, Terms of use at https://www.verisign.com/rpa (c)10, VeriSign Trust Network, "VeriSign, ...
2012-07-23, 3693👍, 0💬

*.wikipedia.org, Wikimedia Foundation, Inc., L=San Francisco,...
Certificate summary - Owner: *.wikipedia.org, "Wikimedia Foundation, Inc.", L=San Francisco, ST=California, US Issuer: DigiCert High Assurance CA-3, www.digicert.com, DigiCert Inc, US Expiration: Wed Dec 12 07:00:00 EST 2012 MD5: C0:C8:F7:A0:33:20:A2:D4:2E:27: 65:73:42:4C:A0:24Hash: Owner Hash=31c69...
2012-07-23, 2986👍, 0💬

OpenSSL "x509 -fingerprint" - Print Certificate Fingerprint
How to print out MD5 and SHA-1 fingerprints of a certificate using OpenSSL "x509" command? I need to see them and validate them with the owner of the certificate. Assuming you have a certificate file located at: C:\Users\fyicenter\twitter.crt ,you can print out certificate fingerprints using the "x5...
2012-07-23, 10007👍, 0💬

OpenSSL "x509 -text" - Print Certificate Info
How to print out text information from a certificate using OpenSSL "x509" command? I want to see the subject and issuer of the certificate. Assuming you have a certificate file located at: C:\Users\fyicenter\twitter.crt ,you can print out certificate information in text format using the "x509 -text"...
2012-07-23, 9458👍, 0💬

OpenSSL "x509" Command Options
What can I use OpenSSL "x509" command for? What are options supported by the "x509" command? OpenSSL "x509" command is a multi purpose certificate utility. It can be used to display certificate information, convert certificates to various forms, sign certificate requests like a "mini CA" or edit cer...
2012-07-23, 7973👍, 0💬

OpenSSL "s_client" Command Options
What can I use OpenSSL "s_client" command for? What are options supported by the "s_client" command? OpenSSL "s_client" command implements a generic SSL/TLS client which can establish a transparent connection to a remote server speaking SSL/TLS. It's intended for testing purposes only and provides o...
2012-07-23, 7035👍, 0💬

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