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Create self signed certificates with Subject Alternative Names
This video explains how to create a self signed certificate with Subject Alternative Names (SAN). A certificate with Subject Alternative Names is a single certificate supporting multiple Common Names (CN), for example: - mobilefish.com - sand.mobilefish.com - baidu.com - china.com This means this single certificate can be used in multiple URLs: - https://mobilefish.com - https://sand.mobilefish.com - https://baidu.com - https://china.com Chrome browsers will issue a warning if your SSL certificate does not specify Subject Alternative Names. This video assumes that you have installed OpenSSL. More information how to install and use OpenSSL:https://www.openssl.org To check if your system has OpenSSL installed, type: openssl version -a The procedure to create self signed certificates with Subject Alternative names is also documented at: https://www.mobilefish.com/developer/apache/apache_quickguide_install_macos_sierra.html Warning: Never use self signed certificates in production environments. It is okay to use it in development or testing environments. 1. Create a 2048 bit Certificate Authority (CA) private key: sudo openssl genrsa -out privkey.pem 2048 The CA private key is created: privkey.pem 2. Create a self signed CA certificate: sudo openssl req -new -x509 -days 3650 -nodes -key privkey.pem -sha256 -out ca.pem 3. Create a 2048 bit Certificate Authority (CA) certificate: Country Name (2 letter code) [AU]:NL State or Province Name (full name) [Some-State]:Noord-Holland Locality Name (eg, city) []:Zaandam Organization Name (eg, company) [Internet Widgits Pty Ltd]:Mobilefish.com CA The CA certificate is created: ca.pem 4. Create a server configuration file (server.csr.cnf). Example: https://www.mobilefish.com/download/openssl/sand.mobilefish.csr.cnf.txt Download and modify the server configuration file according to your situation. [dn] C=NL ST=Zaandam L=Noord-Holland O=End Point OU=Research and development [email protected] CN = sand.mobilefish.com 5. Create a server Certificate Signing Request (CSR) and server private key. sudo openssl req -new -nodes -out server.csr -keyout server.key -config server.csr.cnf The server CSR is created: server.csr The server private key is created: server.key 6. Create a server extension file (server_v3.ext). Example: https://www.mobilefish.com/download/openssl/sand.mobilefish_v3.ext.txt Modify the server extension file according to your situation. Add Subject Alternative Names: [alt_names] DNS.1 = sand.mobilefish.com DNS.2 = proxy.mobilefish.com In the sever configuration file (server.csr.cnf) I have used “CN = sand.mobilefish.com". This common name must be mentioned as one of the Subject Alternative Names. 7. Create the server certificate: sudo openssl x509 -req -in server.csr -CA ca.pem -CAkey privkey.pem -CAcreateserial -out server.crt -days 3650 -extfile server_v3.ext  The server certificate is created: server.crt The serial number file is created: ca.srl Each issued certificate must contain a unique serial number assigned by the CA. It must be unique for each certificate given by a given CA. OpenSSL keeps the used serial numbers on a file. The server certificate (server.crt) and server private key (server.key) are the two files you need to install on your server (Apache web server, proxy server). Always keep the private keys secure: - CA private key (privkey.pem) - Server private key (server.key) Recap We have created our own Certificate Authority (root certificate). But this CA is not trusted by our system. Next our CA has created a certificate with SAN. Trusted CA’s such as Comodo and GoDaddy are trusted because their root certificates are already imported in our system. In YouTube video “Geth supporting SSL using reverse proxy server” I will be using this self signed certificate to setup a reverse proxy server accessible by: https://proxy.mobilefish.com. Check out all my other Ethereum related tutorial videos: https://goo.gl/eNJVXe Subscribe to my YouTube channel: https://goo.gl/61NFzK The presentation used in this video tutorial can be found at: http://www.mobilefish.com/developer/blockchain/blockchain_quickguide_ethereum_related_tutorials.html #mobilefish #howto #ethereum
Views: 7196 Mobilefish.com
setup openssl website  on ubuntu server
$ sudo a2enmod ssl $ sudo service apache2 restart $ mkdir /etc/apache2/ssl $ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/apache2/ssl/apache.key -out /etc/apache2/ssl/apache.crt $ nano /etc/apache2/sites-available/default-ssl.conf $ sudo a2ensite default-ssl.conf $ service apache2 restart
Views: 1122 Sofan Wahyudi
Generate a CSR with an ECC Encryption Algorithm on Microsoft Windows Server 2008
Symantec’s quick tutorial, know how to generate Certificate Signing Request (CSR) using the Elliptical Cryptography Curve (ECC) encryption algorithm on the Microsoft Windows Server 2008. ECC encryption is only available for Symantec Secure Site Pro & Secure Site Pro EV SSL Certificate. For more information on ECC SSL encryption visit here - http://www.symantec.com/connect/blogs/introducing-algorithm-agility-ecc-and-dsa
Views: 587 CheapSSLsecurity
RuhrSec 2016: "The DROWN Attack", Sebastian Schinzel
Abstract. We present DROWN, a novel cross-protocol attack thatcan decrypt passively collected TLS sessions from up-to-dateclients by using a server supporting SSLv2 as aBleichenbacher RSA padding oracle. We implemented theattack and can decrypt a TLS 1.2 handshake using 2048-bit RSA in under 8 hours using Amazon EC2, at a costof $440. Using Internet-wide scans, we find that 33% ofall HTTPS servers and 22% of those with browser-trustedcertificates are vulnerable to this protocol-level attack,due to widespread key and certificate reuse. Biography. Sebastian is a professor for computer security at Münster University of Applied Sciences since 2013. His research topics include penetrationtesting techniques, applied cryptography, side channel attacks, and he speaks regularly at information security conferences.
Views: 1962 Hackmanit GmbH
How to generate sha256 hash self-signed certificate using openssl
Openssl(version0.9.7h and later) supports sha256, but by default it uses sha1 algorithm for signing. In this tutorial we shall see how to generate a digital x509 certificate with sha256 digest algorithm. By the by did i tell you that sha1 is already broken! Check out the complete How-to article : http://techglimpse.com/sha256-hash-certificate-openssl/
Views: 12729 Gaargi S
AskDeveloper Podcast - 47 - Cryptography - Part 2 - Encryption
الحلقة السابقة https://www.youtube.com/watch?v=FcKxlOuGq2U ○ Encryption (Two Ways) § Symmetric Encryption □ Same key both encrypts and decrypts the data. □ Very fast, yet exchanging key is tricky □ Very Algorithmic □ Examples ® DES Data Encryption Standard (BROKEN) ◊ Uses key of 56 bit length ® Triple DES (3DES) ◊ Uses three keys (or two unique keys) of 56 bit each ® AES Advanced Encryption Standard ◊ Uses keys of 128, 192 or 256 bits long □ Attacks ® Brute force ◊ Usually mitigated via increasing key length, as difficulty increases exponentially as key size increases, for example time to crack given a modern super computer. Key Size Time To Crack 56 bits 399 seconds 128 bits 1.02 * 1018 years 192 bits 1.87 * 1037 years 256 bits 3.31 * 1056 years ◊ Side-Channel Attacks § Asymmetric Encryption □ Key pairs have mathematical relationship □ Each one can decrypt messages encrypted by the other. □ Slow, but exchanging key is trivial □ Very Mathematical □ Anyone can know the Public Key ® The Public key can only be used to encrypt data □ The Private key is kept secret, and never leaves the recipient's side. ® The Private key can only be used to decrypt data □ Examples ® RSA (Rivest, Shamir and Adelman) ® The de-facto standard in the industry ® Public and Private keys are based on large Prime Numbers § Hybrid Encryption □ Uses both Symmetric and Asymmetric encryption at the same time. □ Goals: ® Use the performance of Symmetric Crypto ® Convenience of sharing keys using Asymmetric Crypto ® HMAC for authentication. □ Steps: (Order is very important) ® Party 1 (Alice) 1. Generates a random AES Session Key (32 bytes / 256 bits) 2. Generates a random Initialization Vector (IV) (16 bytes / 128 bits) 3. Encrypt the message to be sent using the AES Session Key & IV 4. Calculate an HMAC of the encrypted message using the AES Session key 5. Encrypt the AES Session Key using the Public Key of Party 2 (Bob) The recipient. 6. Sends a packet of (Encrypted Message, Encrypted Session Key, Initialization Vector, and HMAC) to Bob ® Party 2 (Bob) 1. Decrypts Session key using his Private Key 2. Recalculates the HMAC of the encrypted message (Validates message integrity) } If HMAC check pass – Decrypts the message using the decrypted AES Session Key and Initialization Vector } Otherwise, rejects the message because of integrity check failure. Our facebook Page http://facebook.com/askdeveloper On Sound Cloud http://soundcloud.com/askdeveloper Please Like & Subscribe
Views: 747 Mohamed Elsherif

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