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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.

Encryption is the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key.
SSL (Secure Sockets Layer) and/or TLS (Transport Layer Security)
the process of establishing the authenticity of a person or other entity. Not to be confused with authorization - defining access rights to resources.
Specific to the security of passwords: hashing, entropy, cracking, resets, lockouts, etc.
An application that is accessed over a network such as the Internet or an intranet using a browser.
3397 questions
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…
2879 questions
Security of network infrastructure and network traffic. For questions about security of network equipment, topology, protocols, traffic, administration, and configuration. Related tags: [packet], [fir…
2870 questions
Malware is 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…
2549 questions
Cryptography is 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 …
A hash algorithm is 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…
2297 questions
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,…
Securing Linux systems and applications; understanding Linux security features.
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…
1984 questions
Related to email protocols, clients, servers, content, and message format.
1800 questions
A web browser is 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…
1663 questions
Security aspects concerning code written in the programming language PHP which is often used for web applications.
1627 questions
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…
1540 questions
Security for 802.11 wireless networks.
1487 questions
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…
1480 questions
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…
applied to questions related to various VPN types such as PPTP or IPSec.
1377 questions
A man-in-the-middle attack (MiTM) is 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,…
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…
1362 questions
A public-key infrastructure (PKI) is a set of hardware, software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates. In cryptography, a…
1356 questions
The functions performed by the person or processes responsible for security of passwords on a given system.
1331 questions
OpenSSL is an open-source implementation of basic cryptographic primitives, X.509 certificate utilities, and SSL and TLS protocols.
1305 questions
The data, tools, and procedures which, when applied to a specific vulnerability, predictably violate the security design of a system.
1301 questions
A Certificate Authority is 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…
1294 questions
An attempt to penetrate a system's security in an effort to evaluate the protections in place.
1272 questions
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 …
1259 questions
SSH (Secure shell) is a protocol for secure communication between computers to execute remote commands, transfer data and tunnel TCP connections.
Concerned with software or hardware firewalls
1165 questions
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…
1069 questions
A weakness or flaw in computer software and hardware which allows an attacker to take advantage of (exploit) a targeted system.
1042 questions
A computer virus is 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.
1007 questions
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,…
981 questions
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