Overview of CSMA/CA protocol analysis the MAC protocol 802.11 of the wireless LAN standard is very similar to the MAC protocol 802.3 standard. In the 802.3 protocol, the MAC protocol uses a mechanism called CSMA/CD (Carrier Sense Multiple Access/Collision Detect), that is, the Carrier listens to Multiple Access/conflict detection mechanisms. This Protocol resolves how to detect and avoid network conflicts when two or more network devices need to trans
example. Through the official seal, it can be proved that the letter of recommendation is actually issued by the corresponding company.Theoretically, everyone can find a certificate tool and make a certificate of their own. How to prevent the bad guys from making their own certificates and cheating? See the introduction of subsequent CAs. ◇ What is CA?The CA is the abbreviation for "Certificate Authority",
Build your own CA to sign the certificate
This series of articles is divided into three parts: build your own certificate issuing service, generate a certificate request, and sign the generated certificate request through the self-built CA and finally apply it to the service,
This article describes how to use the CA Service in the previous article to sign the c
1. Preface
Because we need to do some development on Ca, we need to do some research on Ca SDK. The following is a brief introduction.
2. Version
NSM uses version 3.1
3. Detailed introduction
The ca sdk mainly includes three aspects: worldview API, Agent API, and enterprises management API.
Currently, worldview APIs and elastic ISES Management APIs are used
First, generate certificate signing Request (CSR) in IIS
Personal understanding: The generation of a CSR is the creation of a "private/public key pair" from which the public key is extracted.
1. Open IIS Manager, select Server certificates in the root node, click the Create certificate Request on the right ..., and then fill in the corresponding distinguished Name Properties (see figure below).
Common name to fill in the domain name (if used for all level two domain name, fill *. domain nam
How does OpenSSL implement private CA.
NOTE 1: The blue part is the main process, and the yellow arrow points to the specific operation steps.
What is OpenSSL?
1. A security protocol that provides security and data integrity for network communication, including key algorithms, common key and certificate encapsulation management functions, and SSL protocols, and provides a wide range of applications for testing or other purposes;
2. OpenSSL is only a
Secure ftp access method 1: Using tcp_wrappers (Simple Firewall) in the main configuration file of vsftpMethod 2: implement secure ftp access using CA authenticationStep 1:1. The main modified file is/etc/hosts. allow/etc/hosts. deny.[Root @ mail ~] # Ldd 'which vsftpd'2. The effect of control is that only the 192.168.1.0 network can be accessed, and others cannot be accessed.[Root @ mail ~] # Man 5 hosts. allow[Root @ mail ~] # Vim/etc/hosts. allowVs
decrypted.OpenSSL, an encryption tool in LinuxOpenSSL: A Multi-Purpose command tool. Each function is implemented using sub-commands. Libcrypto, public encryption library, libssl, SSL Association
Implementation.Symmetric encryption:# OpenSSL ENC-des3-a-salt-in/path/from/somefile-out/path/to/somecipherfileENC encryption tool-des3 encryption algorithm-in output file-out encrypted file locationUnidirectional encryption# OpenSSL DGST [-MD5 |-sha1] [-out/path/to/filename]/path/from/somefileGenerate
A fabric CA is a certification authority for Hyperledger fabric, and it provides the following features:1 The identity of the registered, or connected to LDAP as a user registry;2) Issue the registration certificate (ecerts);3 Issuance of transaction certificates (Tcerts) to provide anonymity and hyperledger when trading on a blockchain Fabric;4 Certificate update and revocation.
A Fabric CA contains a cli
November 8, 2017, hosted by the organizing committee of the World Internet Industry Congress, the "2017 China Blockchain summit and the founding conference of China Blockchain Ecological Alliance" organized by the Blockchain Research Institute of the International Conference on the Industrial Environment of Qingdao, was successfully held at Shangri-La Hotel. Wosign CA was invited to attend the summit and was elected Vice chairman of "China Blockchain
CA Common Services Privilege Escalation Vulnerability (CVE-2015-3318)CA Common Services Privilege Escalation Vulnerability (CVE-2015-3318)
Release date:Updated on:Affected Systems:
CA Common Services
Description:
CVE (CAN) ID: CVE-2015-3318CA Common Services is a Common service bound to multiple CA products on Un
the client and the server agree to use the TLS protocol, they negotiate a stateful connection to transfer the data by using a handshake process. By shaking hands, the client and server negotiate various parameters for creating a secure connection:When a client connects to a server that supports the TLS protocol, it requires the creation of a secure connection and lists the supported password combination handshake to start.The server determines the encryption and hashing functions from this list
OpenSSL provides a powerful feature in this area, and is open source, now widely used in the network communication mechanism;3. By deploying a CA (Certificate authority) server within a certain scope, the certificate authentication and authorization can be realized in the LAN, and the security of data transmission can be ensured, and the working principle of the international large CA institution may be un
NGINX -- configure HTTPS encrypted reverse proxy access-Self-Signed CA, nginxhttps
Reprinted please indicate the source: http://blog.csdn.net/l1028386804/article/details/46695495
For internal access considerations of the company, the CA used is generated by self-Signed Openssl on the local machine. Therefore, it cannot be verified by the Internet industry Root CA
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