T
3DES - Triple Data Encryption Standard - (Three-key, 48 round, encryption)
TAC Design Guide - Thermally Advantaged Chassis Design Guide (Guide containing specifications and recommendations for PC cooling systems.)
TACACS - Terminal Access Controller Access Control System (A remote access communication technology which allows a remote user to connect and authenticate to a network via an intermediary TACACS server.)
TACACS+ - Terminal Access Controller Access - Control System Plus (A Transmission Control Protocol (TCP)-based protocol used to communicate with an Authentication, Authorization, and Accounting (AAA) server, which encrypts an entire authentication packet.)
TAO - track-at-once recording (A method of optical disc CD writing involving multisession recording of session tracks within a session, compared to a single-session method where an entire session is written in one continuing operation, after which the disc is closed.)
tar file - Tape ARchive file (In UNIX, a collection of files made into one file with the tar (Tape ARchive) program. While the name refers to tape storage, most are no longer stored on tape, but on disk.)
TASC Design Guide - Thermally Advantaged Small Chassis Design Guide (Design guide containing specifications for smaller PC cooling systems.)
TAXII - Trusted Automated Exchange of Intelligence Information (A transport protocol developed by the MITRE organization that enables organizations to share threat intelligence over HTTPS and use common application programming interface (API) commands to extract that threat intelligence.)
TB - terabyte (one trillion bytes) (1,000,000,000,000 bytes)
TC - Technical Committee (Committee within the International Committee on Information Tehnology Standards (INCITS), made up of industry representatives, which develops standards for computer components and devices.)
TCB - trusted computing base (A collection of all the hardware, software, and firmware components within a system that provides some type of security and enforces the system's security policy.)
TCG - Trusted Computing Group (Organization promoting open standards to help strengthen computing platforms against security weaknesses and attacks.)
tCL - time CAS (column address strobe) latency (sometimes called read latency) (BIOS performance setting menu - The number of clock cycles occuring between the registration of the CAS signal and the resultant output data.)
TCL/TK - Tool Command Language and (graphical) Tool Kit (A programming language designed to aid in building customized tools.)
TCO - total cost of ownership (The complete cost of owning and using a machine during its useful life, including not only the cost of the machine itself, but also maintenance, repairs, and consumable supplies, such as ink and paper, in the case of a printer.)
TCP - Transmission Control Protocol (The protocol which governs communication between two computers in a session (the session portion of the TCP/IP (Transmission Control Protocol/Internet Protocol) which establishes/verifies a connection with a session computer, ensures that packets reach their destination, and which can terminate a session) and oversees/monitors the computer-to-computer session connection.)
TCP/IP - Transmission Control Protocol/Internet Protocol (A suite of protocols that governs the way data travels from one device to another. TCP is the session portion of the TCP/IP, which establishes/verifies a connection with a session computer, ensures that packets reach their destination, can terminate a session, and oversees/monitors the computer-to-computer session connection. The IP portion deals with the addressing aspect of the data being sent, ensuring that the transmitted data is addressed to the correct receiving network and also addressed to the individual device within the receiving network.)
TCSEC - Trusted Computer System Evaluation Criteria (A collection of computer-security standards developed by the U.S. Department of Defense (DoD). TCSEC was replaced by the Common Criteria as an evaluation standard.)
TDC - Turbo Direct Current current limit override (An Intel performance menu option related to Turbo Boost technology which allows for overriding CPU processor current limit (Amps) settings which normally disengage when the processor is operated beyond this current limit.)
TDE - Transparent Database Encryption (A database encryption system that encrypts a whole database at the file level, as a means to support encryption-at-rest compliance for database files.)
TDEA (3DES) - Triple Data Encryption Algorithm (Encryption method which uses two or three keys, 48 rounds (number of times encrypted data is encrypted again), and also incorporates encryption and decryption processes.)
TDIR - Threat Detection, Investigation and Response (Process, or steps involved in, dealing with threats or potential threats, from detection and analysis, to a decision about how and whether to respond.)
TDM - Time Division Multiplexing (communication sessions given time slot/take turns transmitting)
TDMA - time division multiple access (wireless radio-frequency channels alloted time slots/taking turns)
TDoS - Telephony Denial-of-Service attack (A denial of service attack launched against traditional and packet-based telephone systems. Attempts to prevent telephone calls from being initiated or received by an individual or organization.)
TDP - thermal design power (processor power capacity)
TDP Power Limit Override - thermal design power Power Limit Override (Intel Turbo Boost Technology processor power setting in Watts)
TDR - time domain reflectometer (fiber-optic cable test equipment)
Telnet - Protocol for text communications (remote UNIX systems access)
TEMPEST - Transient Electromagnetic Pulse Emanation Standard (standard for equipment shielding to suppress radiation emissions)
tFAW - time Four Active Window (memory override - time before fifth command can be issued)
TF - thin film head (read-write head composition)
TFA - Two-Factor Authentication (A method of security authentication that requires two separate means of authentication, such as using an identity card plus entering a password or using a fingerprint.)
TFT - thin-film transistor array (computer monitor display technology)
TFTP - Trivial File Transfer Protocol (A protocol which transfers files with a remote host. TFTP is an insecure protocol which does not require authentication of user credentials.)
TFX 12V - thin form factor 12 volt (low-profile shape/dimension)
TGAR - Trunk Group Access Restriction (internal voice line access to outside phone line)
TGS - Ticket-Granting Server (Service) (A server or function within a Kerberos Key Distribution Center (KDC) server which provides additional tickets for the same user after the user has been verified.)
TGT - Ticket-Granting Ticket (Time stamped ticket provided by a Kerberos server to an authenticated user which allows the user to request access later for applications.)
THD - total harmonic distortion (speaker sound distortion from signal amplification)
Thicknet - thick coaxial cable (original form of Ethernet (local connection))
Thinnet - thin coaxial cable
TIC - Trusted Internet Connections (An initiative announced in 2007 for federal agencies which was intended to reduce the system attack surface by reducing the total number of Internet points-of-presence which, at the time were over 4,000, to fewer than 100.)
TIFF - Tag/Tagged Image File Format (graphics file format)
TIM - thermal interface material (thermal grease applied to heatsink)
TKIP - Temporal Key Integrity Protocol (Encryption mechanism used with Wi-Fi Protected Access (WPA) which encrypts every packet transmitted from a wireless device with a different key (dynamic encryption).)
TLA - three-letter acronym
TLA - three-letter abbreviation
TLB - translation lookaside buffer (processor design memory feature)
TLC - triple-level-cell (solid-state drive memory technology)
TLD - Top-Level Domain (In the Domain Name System (DNS) a term which refers to website addresses with extensions such as ".com" ".net" ".org" ".edu" ".gov" ".mil" or similar designations. These are also referred to as root domains, which are part of a Fully Qualified Domain Name (FQDN), which is the complete website address, such as "www.websitename.com" or "www.websitename.net")
TLS - Transport Layer Security (A protocol used to protect HTTP (Hypertext Transfer Protocol) (Internet message) traffic by encyrpting data as it moves from one system to another.)
TMDS - Transition Minimized Differential Signaling (video card - monitor display interface)
tn - Telnet (Protocol for text communications)
TNC - terminal-node controller (computer link (node) controlling wireless device)
TOC - threat operations center (An operations center which primarily focuses on threats - gathering intelligence, providing analysis, characterizing threats, attempting attribution (source or actors involved), and threat creation, as well as sharing information and situational awareness with teams, and the development of mitigation strategies and counter-measures. - A TOC can be created as a standalone operation or as part of a SOC (security operations center).)
TOC/TOU - time of check, time of use (An item is validated by the system (essentially time-stamped by the computer) at one time but used at another. An attacker can use the window between these times to modify the item's value, such as in a way which allows the user to insert malicious code.)
TOE - target of evaluation (Term used in the system security evaluation process (under the Common Criteria ISO framework) to refer to a product proposed as a solution to a security problem, i.e, the product is the "target" to be evaluated.)
TOGAF - The Open Group Architecture Framework (enterprise information architecture development - business, data, applications, technology)
Tor - The Onion Router (A privacy-focused network that hides an individual's traffic, by routing it through multiple random servers on the Tor network and, in addition, employs advanced cryptography with each routing step. The Tor system started as a research project sponsored by the U.S. Naval Research Laboratory in 2004 and takes its name from the layered manner in which it employs advanced cryptography, thus resembling the layers of an onion.)
ToS - Type of Service (packet prioritization for time-sensitive functions)
TOTP - time-based one-time password (A password which can only be used one time to authenticate, or grant access to, one communications session and, in addition, has a time limit or window in which it must be used, or it will expire.)
TP - transformation procedure (programmed operation - read, write)
TPI - tracks per inch (disk density/recording capacity measure)
TPM - Trusted Platform Module (A microchip installed on the motherboard of modern computers dedicated to carrying out security functions involving the storage and processing of symmetric and symmetric keys, hashes, and digital certificates.)
TPR - true positive rate (The percentage of malware (or other type of value) a system will correctly detect.)
tREF - time between refresh cycles (dynamic random access memory automatic data reading)
TRIM - command to erase unused blocks (blocks of data)
Triple DES - Triple Data Encryption Standard - (Three-key, 48 round, encryption)
TRM - Technical Reference Model
TS - Terminal Services (Windows remote server access)
TS-CAL - Terminal Services-Client Access License (Windows license - simultaneous remote server access)
TSIG - transaction signature (cryptographic trusted-host zone information transfer)
TSO - Time Sharing Option (operating system timesharing terminals)
TTL - Time to Live (Operational self-destruct function or value built into a packet, which "kills" or destroys the packet after it passes through a router so many times, so that it does not traverse a network forever. It normally works by assigning a TTL value when the packet is created, which is decremented (reduced) every time the packet passes through a router, until it reaches zero.)
TTL - Transistor-Transistor Logic (digital integrated circuit type)
TTP - tactics, techniques and procedures (Operational methods used in carrying out an operation or attack, individual techniques or variations, and the step-by-step procedures followed in an attack. An understanding or analysis of TTP can be helpful in identifying attackers, or the source of the attack, since certain groups will favor, and repeat, certain methods of attack, and finally, in developing counter-measures or creating methods to defend against future attacks.)
TTP - tools, techniques and processes (Alternative term or phrase for "tactics, techniques and procedures" to describe the operational methods used in carrying out an operation or attack, individual techniques or variations, and the step-by-step procedures followed in an attack. An understanding or analysis of TTP can be helpful in identifying attackers, or the source of the attack, since certain groups will favor, and repeat, certain methods of attack, and finally, in developing counter-measures or creating methods to defend against future attacks.)
TÜV - Technischer Überwachungs-Verein (German electronic equipment standards organization)