A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key.
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SSL (Secure Sockets Layer) and/or TLS (Transport Layer Security)
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the process of establishing the authenticity of a person or other entity. Not to be confused with authorization - defining access rights to resources.
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Specific to the security of passwords: hashing, entropy, cracking, resets, lockouts, etc.
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accessed over a network such as the Internet or an intranet using a browser.
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Security of network infrastructure and network traffic. For questions about security of network equipment, topology, protocols, traffic, administration, and configuration. Related tags: [packet], [fir…
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A piece of data used in public key cryptography (specifically public key infrastructures) that contains identifying information (i.e. email address or web address), a hash of a public key, and a digit…
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the practice and study of logical means used to achieve information confidentiality, integrity and authenticity. It covers, among other things, encryption (making some data unreadable …
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any software application which subverts the will of the legitimate owner of a computer, by means of force or subterfuge, with or without personal or monetary gain on the part of the creator…
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a function which takes a variable size input and produces a fixed size output. The algorithm tries to make it difficult to predict the output for a given input, find two inputs wit…
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Related to security concerns specific to the Microsoft Windows operating system itself. For security of applications that happen to be running on Windows, please use [appsec]. For the X Window System,…
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Securing Linux systems and applications; understanding Linux security features.
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The attribute of a system that prevents the release of data to unauthorized individuals. The ability or expectation of an individual or group to reveal information about themselves selectively or n…
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Related to email protocols, clients, servers, content, and message format.
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Security aspects concerning code written in the programming language PHP which is often used for web applications.
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an application which uses HTTP and related protocols to retrieve HTML and XML data from servers. As the web has become a critical source of information and communication, web browsers…
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Security for 802.11 wireless networks.
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An attempt to penetrate a system's security in an effort to evaluate the protections in place.
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Cross-Site Scripting: An attack method that involves injection of code or markup into a webpage. There are three major types of XSS: Reflected XSS, Stored XSS (aka persistent XSS) and DOM-based XSS (a…
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Definition: HTTP - the Hypertext Transfer Protocol - provides a standard for Web browsers and servers to communicate. The definition of HTTP is a technical specification of a network protocol that sof…
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a set of hardware, software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates. In cryptography, a…
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The functions performed by the person or processes responsible for security of passwords on a given system.
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The data, tools, and procedures which, when applied to a specific vulnerability, predictably violate the security design of a system.
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An attempt to exploit a weakness in a system, either for nefarious or research reasons. Questions with this tag should be about designing, carrying out, or defending against the attack itself, rather …
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The common name for the language used primarily for scripting in web browsers. It is not related to the Java language. Standardized as ECMAScript, its dialects/implementations include JavaScript and J…
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Questions tagged [Android] should focus on security of the operating system itself, or of Android-specific apps. Questions about Android that are not directly security-related should be asked at andro…
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an attack against a communication protocol where the attacker relays and modifies messages in transit. The parties believe they are talking to each other directly,…
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the collection of hardware, software, and people responsible for issuing certificates in a hierarchical PKI. CAs may be public, as in SSL / TLS and government IDs, or privat…
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applied to questions related to various VPN types such as PPTP or IPSec.
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an open-source implementation of basic cryptographic primitives, X.509 certificate utilities, and SSL and TLS protocols.
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Concerned with software or hardware firewalls
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a protocol for secure communication between computers to execute remote commands, transfer data and tunnel TCP connections.
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Security in mobile devices. Issues concerning regular cellphones, smartphones, tablet computers and other portable information devices all fit into this category. If your question is specific to one o…
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Application security - Specific to security concerns for an application that are independent from the underlying operating system, or surrounding infrastructure. Pertains to the design / architecture,…
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to deliver web pages on request to clients.
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a program or piece of code that tends to be malicious and is loaded onto your computer without your knowledge and runs against your wishes.