NSS Highlights
Security: NSS uses a series of cryptography technologies to ensure the confidentiality, integrity and credibility of data.
Portability: NSS can run on multiple operating systems and platforms, providing a unified set of APIs so that developers can write the same code on different platforms.
Scalability: NSS supports a variety of cryptography standards and protocols, and can add new functions and algorithms through plug-ins, making it highly adaptable.
User-friendliness: NSS provides easy-to-use command line tools and graphical interfaces to help users manage certificates, keys, and security policies.
NSS features
NSS is widely used in various network security-related software and applications, such as web servers, email servers, VPN servers, etc. It provides powerful security features to protect users' privacy and data security, and improve the reliability and security of network communications.
NSS function
Call control:
Responsible for establishing, maintaining and releasing call connections to ensure smooth progress of calls. This function is particularly important in communication systems, as it ensures that both communicating parties can transmit data stably and reliably.
Billing:
Record and process charge information related to communication services to provide users and operators with accurate billing data. This feature is critical for operators to achieve fair and transparent billing mechanisms.
Mobility management:
Manage mobile user registration, location updates, roaming and other functions to ensure that users can obtain communication services in different geographical locations. This capability is critical to providing seamless, continuous communication services.
NSS provides various encryption algorithms, including symmetric encryption (such as AES, DES), asymmetric encryption (such as RSA, Diffie-Hellman), and hash functions (such as MD5, SHA-256), for data encryption and decryption operations.
Digital certificate management:
NSS can be used to generate, issue and verify digital certificates for secure authentication and data transmission.
SSL/TLS protocol support:
NSS supports SSL (Secure Socket Layer) and TLS (Transport Layer Security) protocols, which are used to establish secure encrypted connections on the network and protect the transmission security of sensitive data.
Secure communication protocol support:
NSS supports various secure communication protocols, including HTTPS, SMTPS, IMAPS, etc., to protect the security and privacy of network communications.
Cross-platform:
NSS is a cross-platform network security services library available on multiple operating systems, including Linux, Windows and Mac OS.
NSS FAQ
Outdated version or incorrect configuration
Problem description: In systems such as CentOS, NSS is often called by dependent libraries such as apache and OpenLDAP. If its version is out of date or misconfigured, the service may fail to start or suffer man-in-the-middle attacks.
Solution: Regularly updating and optimizing NSS configuration is an important part of system maintenance. You can update NSS packages through the repository and restart services that rely on NSS. Avoid directly replacing binaries to avoid breaking the dependency chain. If you need to customize the compiled version, it is recommended to obtain the official source code from Mozilla and generate a compatibility package.
SSL certificate is not trusted
Problem description: When the application prompts "SSL certificate is not trusted", it is usually caused by the root certificate being missing or expired.
Solution: Check and update the root certificate to ensure the validity of the certificate. At the same time, older versions of NSS may not support new versions of the TLS protocol (such as TLS 1.3), causing clients to be unable to connect. At this time, it is recommended to update NSS to the latest version.
NSS update log:
1. Fixed BUG, the new version has a better experience
2. Some pages have been changed
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