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Secure communication method
Quantum key distribution (QKD) is a secure communication method that implements a cryptographic protocol based on the laws of quantum mechanics, specifically
Quantum_key_distribution
Quantum key distribution (QKD) protocols are used in quantum key distribution. The first protocol of that kind was BB84, introduced in 1984 by Charles
List of quantum key distribution protocols
List_of_quantum_key_distribution_protocols
Field of robotics, physics
systems. The free-space quantum communication between mobile platforms was proposed for reconfigurable quantum key distribution (QKD) applications using
Quantum_robotics
Cryptography based on quantum mechanical phenomena
cryptography is quantum key distribution (QKD), which offers an information-theoretically secure solution to the key-exchange problem. Quantum cryptography
Quantum_cryptography
Networks connecting quantum processors
require only very modest quantum processors. For most quantum internet protocols, such as quantum key distribution in quantum cryptography, it is sufficient
Quantum_network
development of quantum computing, quantum communication and quantum sensing. Quantum computing and communication are two sub-fields of quantum information
List of companies involved in quantum computing, communication or sensing
List_of_companies_involved_in_quantum_computing,_communication_or_sensing
Computer hardware technology that uses quantum mechanics
applied quantum theory to cryptography protocols and demonstrated that quantum key distribution could enhance information security. Quantum algorithms
Quantum_computing
High-dimensional quantum key distribution (HDQKD) is a technology for secure communication between two parties. It allows for higher information efficiency
High-dimensional quantum key distribution
High-dimensional_quantum_key_distribution
Information held in the state of a quantum system
applications of quantum cryptography is quantum key distribution which provide a theoretical solution to the security issue of a classical key. The advantage
Quantum_information
Encryption technique
equals the size of the pad. Quantum key distribution also proposes a solution to this problem, assuming fault-tolerant quantum computers. Distributing very
One-time_pad
Quantum key distribution protocol
prepare-and-measure quantum key distribution (QKD) protocol, in which, one party (e.g. Alice) performs the encoding by preparing the quantum states, and the
BB84
Method of exchanging cryptographic keys
1024-bit primes. Quantum computers can break public-key cryptographic schemes, such as RSA, finite-field DH and elliptic-curve DH key-exchange protocols
Diffie–Hellman_key_exchange
Surveillance strategy
concerns about the need to urgently deploy post-quantum cryptography; even though no practical quantum attacks yet exist, some data stored now may still
Harvest_now,_decrypt_later
Indian proposed quantum computer
establish a multi-node quantum network to implement inter-city quantum key distribution (QKD) for covering distances of over 2,000 kilometres. There is
India's_quantum_computer
Chinese quantum research satellite
European receiving stations. The satellite conducted Space-Earth quantum key distribution (Chinese: 量子密钥分发) experiments, facilitated by laser communications
Quantum Experiments at Space Scale
Quantum_Experiments_at_Space_Scale
Computational benchmark
In quantum computing, quantum supremacy or quantum advantage is the goal of demonstrating that a programmable quantum computer can solve a problem that
Quantum_supremacy
Practice and study of secure communication techniques
computational problems Pre-shared key – Method to set encryption keys Quantum cryptography – Cryptography based on quantum mechanical phenomena Secure cryptoprocessor
Cryptography
Protocol in quantum cryptography
In quantum cryptography, a decoy state protocol is a quantum key distribution (QKD) scheme. Practical QKD systems use multi-photon sources, in contrast
Decoy_state
Cryptography secured against quantum computers
(usually public-key algorithms) that are currently thought, but not proven, to be secure against a cryptanalytic attack by a quantum computer. Most widely
Post-quantum_cryptography
Aspect of quantum information science
negative energy signals and noise. Quantum teleportation Quantum entanglement Spin chains Quantum key distribution Quantum information science Hotta, Masahiro
Quantum_energy_teleportation
Algorithm
to do. Most modern symmetric-key algorithms appear to be resistant to the threat of post-quantum cryptography. Quantum computers would exponentially
Symmetric-key_algorithm
Governmental science and technology project
approved the National Quantum Mission with a cost of INR 6003.65 cr ($730,297,000) from 2023–24 to 2030–31. Quantum key distribution (QKD) satellites are
National Quantum Mission India
National_Quantum_Mission_India
Password cracking dataset
passwords. A common defense against this attack is to compute the hashes using a key derivation function that adds a "salt" to each password before hashing it
Rainbow_table
Proposed design of bank notes
later influenced the development of quantum key distribution protocols used in quantum cryptography. Wiesner's quantum money scheme was first published in
Quantum_money
German cipher machine during World War II
January 2011). The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography. Knopf Doubleday Publishing Group. p. 139. ISBN 978-0-307-78784-2
Enigma_machine
Random data used as an additional input to a hash function
generated for each password. The salt and the password (or its version after key stretching) are concatenated and fed to a cryptographic hash function, and
Salt_(cryptography)
Cryptographic hash function
2128) Length of the message in bytes Key Optional 0..64 byte key cbKeyLen: Number, (0..64) Length of optional key in bytes cbHashLen: Number, (1..64) Desired
BLAKE_(hash_function)
Computer communications authentication algorithm
sized key block_sized_key = computeBlockSizedKey(key, hash, blockSize) o_key_pad ← block_sized_key xor [0x5c blockSize] // Outer padded key i_key_pad ←
HMAC
Unit of quantum information
A qutrit (or quantum trit) is a unit of quantum information that is realized by a 3-level quantum system (qudit with radix 3), that may be in a superposition
Qutrit
Cipher machines used by the German Army during World War II
land-line circuits was used for this traffic. These audio frequency shift keying non-Morse (NoMo) messages were picked up by Britain's Y-stations at Knockholt
Lorenz_cipher
Process of copying a quantum state with no modification of the original
applications of quantum cloning is to analyse the security of quantum key distribution protocols. Teleportation, nuclear magnetic resonance, quantum amplification
Quantum_cloning
English cryptanalyst (1917–1996)
algorithm Authenticated encryption Public-key cryptography Quantum key distribution Quantum cryptography Post-quantum cryptography Message authentication code
Joan_Clarke
Type of functions designed for being unsolvable by root-finding algorithms
(CRNG). Most cryptographic applications require random numbers, for example: key generation initialization vectors nonces salts in certain signature schemes
Cryptographically secure pseudorandom number generator
Cryptographically_secure_pseudorandom_number_generator
Quantum key distribution network
The DARPA Quantum Network (2002–2007) was the world's first quantum key distribution (QKD) network, operating 10 optical nodes across Boston and Cambridge
DARPA_Quantum_Network
This list contains quantum processors, also known as quantum processing units (QPUs). Some devices listed below have only been announced at press conferences
List_of_quantum_processors
Project by NIST to standardize post-quantum cryptography
in a way that makes them quantum resistant, efforts have focused on public-key cryptography, namely digital signatures and key encapsulation mechanisms
NIST Post-Quantum Cryptography Standardization
NIST_Post-Quantum_Cryptography_Standardization
Set of cryptographic hash functions
hash function remains secure against known attacks, including those from quantum computers. With the publication of FIPS PUB 180-2, NIST added three additional
SHA-2
Cryptanalytic method for unauthorized users to access data
brute-force attack or exhaustive key search is a cryptanalytic attack that consists of an attacker submitting many possible keys or passwords with the hope
Brute-force_attack
Process of converting plaintext to ciphertext
computing power, a 56-bit key is no longer secure, being vulnerable to brute force attacks. Quantum computing uses properties of quantum mechanics in order to
Encryption
Technological development using the laws of quantum mechanics
such as quantum key distribution (QKD), the use of a quantum random number generator, quantum dense coding, and quantum teleportation. Quantum key distribution
Quantum_engineering
Quantum search algorithm
In quantum computing, Grover's algorithm, also known as the quantum search algorithm, is a quantum algorithm for unstructured search that finds with high
Grover's_algorithm
Simple and widely known encryption technique
places, equivalent to a right shift of 23 (the shift parameter is used as the key): When encrypting, a person looks up each letter of the message in the "plain"
Caesar_cipher
Deviations from local realism
for quantum key distribution and randomness expansion. Action at a distance Buscemi nonlocality Popper's experiment Quantum pseudo-telepathy Quantum contextuality
Quantum_nonlocality
Cryptographic key management algorithm
renegotiation of forward keys; properties for which the protocol is named. This has been extended as of October 2025 to the Sparse Post Quantum Ratchet (SPQR) with
Double_Ratchet_Algorithm
Quantum states light can be in
state, EPR correlations exist, see Fig. 5. The aim of quantum key distribution is the distribution of identical, true random numbers to two distant parties
Squeezed_states_of_light
Stream ciphers
function maps a 256-bit key, a 64-bit nonce, and a 64-bit counter to a 512-bit block of the key stream (a Salsa version with a 128-bit key also exists). This
Salsa20
Model of quantum computing
In quantum information theory, a quantum circuit is a model for quantum computation, similar to classical circuits, in which a computation is a sequence
Quantum_circuit
Message-digest hashing algorithm
non-cryptographic purposes, for example for determining the partition for a particular key in a partitioned database, and may be preferred due to lower computational
MD5
Criteria for a usable quantum computer
additional conditions regard implementing quantum communication, such as that used in quantum key distribution. One can demonstrate that DiVincenzo's criteria
DiVincenzo's_criteria
Number of bits in a key used by a cryptographic algorithm
be able to search the possible keys more efficiently. If a suitably sized quantum computer would reduce a 128-bit key down to 64-bit security, roughly
Key_size
Optimization algorithms using quantum computing
Quantum optimization algorithms are quantum algorithms that are used to solve optimization problems. Mathematical optimization deals with finding the
Quantum optimization algorithms
Quantum_optimization_algorithms
B92 protocol BB84 BBM92 protocol Decoy state High-dimensional quantum key distribution KMB09 protocol MSZ96 SARG04 Six-state protocol Falcon Hash-based
List of cryptographic software
List_of_cryptographic_software
Function that derives secret keys from a secret value
cryptography, a key derivation function (KDF) is a cryptographic algorithm that derives one or more secret keys from a secret value such as a master key, a password
Key_derivation_function
Quantum key distribution protocol - B92
B92 is a quantum key distribution (QKD) protocol developed by Charles Bennett in 1992. It is a simplified alternative to the BB84 protocol, using only
B92_protocol
Swiss tech company
ID Quantique (IDQ) is a Swiss company that provides quantum key distribution (QKD) systems, quantum safe network encryption, single photon counters, and
ID_Quantique
Cryptographic hash function
by a keyed hash – SHA(key || message), but not SHA(message || key) – by extending the message and recalculating the hash without knowing the key. A simple
SHA-1
Algorithm for public-key cryptography
involves four steps: key generation, key distribution, public-key operation (used for encryption or verifying a signature), and private key operation (used
RSA_cryptosystem
Free and open-source disk encryption utility
block cipher mode of operation is XTS. It generates the header key and the secondary header key (XTS mode) using PBKDF2 with a 512-bit salt. By default, they
VeraCrypt
Type of data structure
anti-entropy, replicas exchange Merkle trees to identify parts of their replicated key ranges which are out of sync. A Merkle tree is a hierarchical hash verification:
Merkle_tree
Simple encryption method
concern—the use of a constant shift means that the encryption effectively has no key, and decryption requires no more knowledge than the fact that ROT13 is in
ROT13
Basic unit of quantum information
In quantum computing, a qubit (/ˈkjuːbɪt/) or quantum bit is a basic unit of quantum information, the quantum version of the classic binary bit. A qubit
Qubit
Austrian physicist
is an Austrian physicist who conducts research in quantum communication and quantum key distribution. He has taught as an associate professor at the University
Thomas_Jennewein
Quantum Mechanics in Neural Networks
Quantum neural networks are computational neural network models which are based on the principles of quantum mechanics. The first ideas on quantum neural
Quantum_neural_network
Early block substitution cipher
very little security. The Playfair cipher uses a 5 × 5 table containing a key word or phrase. Memorization of the keyword and 4 simple rules was all that
Playfair_cipher
problems include quantum key distribution, randomness expansion, and randomness amplification. The goal of quantum key distribution is for two parties
Device-independent quantum cryptography
Device-independent_quantum_cryptography
System to replace plaintext with ciphertext
units of the plaintext (its input) in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets
Substitution_cipher
System that regulates the formation of blocks on a blockchain
protocols because the variance of a rectangular distribution is lower than the variance of a Poisson distribution (with the same mean).[further explanation
Proof_of_work
Interdisciplinary theory behind quantum computing
Quantum information science is an interdisciplinary field that combines the principles of quantum mechanics, information theory, and computer science
Quantum_information_science
ESA-Hispasat project for quantum key distribution from GEO and LEO orbits QKDSat, future – joint ESA-Honeywell quantum key distribution satellite IRIS², launching
List of European Space Agency programmes and missions
List_of_European_Space_Agency_programmes_and_missions
Hiding messages in other messages
lack a formal shared secret are forms of security through obscurity, while key-dependent steganographic schemes try to adhere to Kerckhoffs's principle
Steganography
Algorithm for encrypting and decrypting information
deciphering key. If one key cannot be deduced from the other, the asymmetric key algorithm has the public/private key property and one of the keys may be made
Cipher
Method of inferring the results of a computation without running a quantum computer
Counterfactual quantum computation is a method of inferring the result of a computation without actually running a quantum computer otherwise capable
Counterfactual quantum computation
Counterfactual_quantum_computation
Used for encoding or decoding ciphertext
systems. However, current RSA key sizes would all be cracked quickly with a powerful quantum computer. "The keys used in public key cryptography have some mathematical
Key_(cryptography)
Change of basis applied in quantum computing
In quantum computing, the quantum Fourier transform (QFT) is a linear transformation on quantum bits, and is the quantum analogue of the discrete Fourier
Quantum_Fourier_transform
U.S. government cryptographic standard
algorithm Authenticated encryption Public-key cryptography Quantum key distribution Quantum cryptography Post-quantum cryptography Message authentication code
FIPS_140-3
Mathematical scheme for verifying the authenticity of digital documents
Digital signatures are a type of public-key cryptography, and are commonly used for software distribution, financial transactions,[citation needed]
Digital_signature
Simple type of polyalphabetic encryption system
increment is determined by the corresponding letter of another text, the key. In a Caesar cipher, each letter of the alphabet is shifted along some number
Vigenère_cipher
Property of computational resources needed
In quantum information theory, magic is a property that quantifies the computational resources needed to describe quantum states beyond stabilizer states
Magic_(quantum_information)
Photonics to control quantum states
technologies, such as Quantum computing, Quantum key distribution and Quantum metrology. Photons are particularly attractive carriers of quantum information due
Integrated_quantum_photonics
Conditional independence of exchangeable observations
been found to be useful in quantum information, in topics like quantum key distribution and entanglement detection. A multivariate extension of de Finetti's
De_Finetti's_theorem
Authenticated encryption mode for block ciphers
cryptography, Galois/Counter Mode (GCM) is a mode of operation for symmetric-key cryptographic block ciphers. The proposal was first published in 2007. The
Galois/Counter_Mode
Notion in network science of quantum information networks
using features such as quantum key distribution is an application of quantum cryptography that enables secure communications Quantum teleportation can transfer
Quantum_complex_network
Cryptographic primitives that involve lattices
constructions support important standards of post-quantum cryptography. Unlike more widely used and known public-key schemes such as the RSA, Diffie-Hellman or
Lattice-based_cryptography
it is much more useful in quantum communication (such as quantum teleportation and quantum key distribution) than in quantum computation. Time-bin encoding
Time-bin_encoding
European quantum communication satellite
demonstration satellite for in-orbit demonstration of space-based quantum key distribution. The satellite was developed by a consortium of companies led by
Eagle-1
Proposed quantum computer implementation
A trapped-ion quantum computer (TIQC) is one proposed approach to a large-scale quantum computer. Ions, or charged atomic particles, can be confined and
Trapped-ion_quantum_computer
System that can issue, distribute and verify digital certificates
entity via digital signatures. A public key infrastructure (PKI) is a system for the creation, storage, and distribution of digital certificates, which are
Public_key_infrastructure
Forecasting rules for quantum computing
addresses one of quantum computing's most fundamental challenges. Quantum volume Superconducting quantum computing The introduction summarizes key points from
Quantum computing scaling laws
Quantum_computing_scaling_laws
generator, development of a quantum key distribution (QKD) system, and other encryption solutions that include automatic key zeroization. The company was
QuintessenceLabs
Quantum physics of light and matter in a cavity
Cavity Quantum Electrodynamics (cavity QED) is the study of the interaction between light confined in a reflective cavity and atoms or other particles
Cavity quantum electrodynamics
Cavity_quantum_electrodynamics
Type of cryptographic attack
the same probability. There is a general (though disputed) result that quantum computers can perform birthday attacks, thus breaking collision resistance
Birthday_attack
Foundational object in quantum communication theory
In quantum information theory, a quantum channel is a communication channel that can transmit quantum information, as well as classical information. An
Quantum_channel
Experimental technology level
Noisy intermediate-scale quantum (NISQ) computing is characterized by quantum processors containing up to 1,000 qubits which are not advanced enough yet
Noisy intermediate-scale quantum computing
Noisy_intermediate-scale_quantum_computing
Branch of physics seeking to explain chaotic dynamical systems in terms of quantum theory
Hamiltonian (system). Study of probability distribution of individual eigenstates (see scars and quantum ergodicity). Semiclassical methods such as periodic-orbit
Quantum_chaos
Interpretation of quantum mechanics
possible outcome of a quantum event. The many-worlds interpretation's key idea is that the linear and unitary dynamics of quantum mechanics applies everywhere
Many-worlds_interpretation
Standard for the encryption of electronic data
AES-128 are not considered quantum resistant due to their smaller key sizes. AES-192 has a strength of 96 bits against quantum attacks and AES-128 has 64
Advanced_Encryption_Standard
Continuous (non-quantized) quantities in quantum information science
continuous quantum variables. Continuous-variable quantum systems can be used for quantum cryptography, and in particular, quantum key distribution. Quantum computing
Continuous-variable quantum information
Continuous-variable_quantum_information
Substitution cipher
as it lacks any sort of key. If multiple collating orders are available, which one was used in encryption can be used as a key, but this does not provide
Atbash
Quantum-informatics technique
The term quantum state discrimination collectively refers to quantum-informatics techniques, with the help of which, by performing a small number of measurements
Quantum_state_discrimination
Swiss physicist
307 km using Plug-&-Play and Coherent One Way configurations for quantum key distribution. In 1997, Nicolas Gisin and his group demonstrated Bell inequality
Nicolas_Gisin
QUANTUM KEY-DISTRIBUTION
QUANTUM KEY-DISTRIBUTION
Surname or Lastname
English and German
English and German : variant of Kay.Irish : reduced form of McKay.
Boy/Male
Indian, Sanskrit, Tamil
Key; Love
Boy/Male
Indian
Key
Male
Japanese
(1-æµ, 2-ä½³, 3-敬, 4-åœ, 5-æ…§) Japanese name KEI means 1) "blessed, lucky," 2) "excellent," 3) "respect," 4) "square jewel," or 5) "wise."
Surname or Lastname
English
English : variant of Nye.Irish : reduced form of O’Ney.North German and Jewish (Ashkenazic) : variant of Neu. The Jewish surname may sometimes be a shortened form of a name such as Neuburger.German : habitational name from a place near Boppard.North German : nickname from Middle Low German ni(g)e, ney(g)e ‘(the) new one’.Dutch : from a short form of the personal name Aarnoud (see Arnold).Dutch (de Ney) : variant of Nay 3.
Surname or Lastname
English
English : nickname from Middle English ca ‘jackdaw’, from an unattested Old Norse ká. See also Daw.English : nickname from Middle English cai, kay, kei ‘left-handed’, ‘clumsy’.English : metonymic occupational name for a locksmith, from Middle English keye, kaye ‘key’. Compare Care, Kear.English : topographic name for someone living on or near a quay, Middle English kay(e), Old French cay.English : from a Middle English personal name which figures in Arthurian legend. It is found in Old Welsh as Cai, Middle Welsh Kei, and is ultimately from the Latin personal name Gaius.Scottish and Irish : reduced form of McKay.French : variant of Quay, cognate with 2.Much shortened form of any of various names, mostly Eastern European, beginning with the letter K-.Variant of Danish and Frisian Kai.
Boy/Male
Muslim
Key
Girl/Female
American, British, Chinese, Dutch, English, Finnish, French, German, Greek, Hebrew, Latin, Scandinavian
Rejoiced; Short Form of Katherine and Other Names Beginning with K; Happy; Pure; Clear; Form of Katherine; Virginal; Keeper of the Keys; Elder Sister
Surname or Lastname
English and Scottish
English and Scottish : variant of Kay.
Boy/Male
Gaelic
Son of Aidan.
Male
Greek
(Κήυξ) Greek name, possibly KEYX means "kingfisher." In mythology, this is the name of a king of Thessaly, the son of Eosphoros.
Boy/Male
Muslim/Islamic
Key
Male
Turkish
Turkish name GÖKER means "man of the sky."
Boy/Male
Arabic
Key; Opener
Male
Japanese
(1-å¥, 2-謙, 3-ç ”) Japanese name KEN means 1) "healthy, strong" or 2) "modest," or 3) "study." Compare with another form of Ken.
Surname or Lastname
English
English : unexplained; possibly a respelling of Kay 6, a shortened form of Scottish and Irish McKay.Korean : There is only one Chinese character and one clan for the Kye family name. According to the Kye family genealogy, the clan was founded by a Ming Dynasty government official named Kye SÅk-son who migrated to KoryÅ and settled in today’s Suan County of Hwanghae Province. The majority of bearers of the Kye family name today live in North Korea.
Boy/Male
Christian, Gaelic, Indian
The One who Opens the Lock
Boy/Male
Bengali, English, Indian, Sindhi
Key
Boy/Male
Arabic, Muslim
Key; Opener
Male
English
Short form of English Kenneth, KEN means both "born of fire" and "comely; finely made." Also used as a nickname for other names that begin with Ken-. Compare with another form of Ken.
QUANTUM KEY-DISTRIBUTION
QUANTUM KEY-DISTRIBUTION
Girl/Female
Gujarati, Indian, Kannada
Mercy; Very Flexible
Boy/Male
Arabic
Reciter of Holy Quran
Boy/Male
Indian
Appearance
Girl/Female
Hindu, Indian, Marathi, Sanskrit
Protected by the Goddesses; Mighty Goddess
Surname or Lastname
English
English : unexplained; it appears to be a variant of Allerston, a habitational name from a place so named in North Yorkshire, but the concentration of the name in Essex and adjoining counties suggests a different source may be involved.
Boy/Male
Hindu, Indian, Marathi, Sanskrit, Tamil
Divine Love; Supreme Love
Boy/Male
Biblical
Thought, wickedness.
Boy/Male
Muslim
The one respected
Female
Spanish
Feminine form of Spanish Fidel, FIDELIA means "faithful."
Boy/Male
Hindu, Indian
Black Man
QUANTUM KEY-DISTRIBUTION
QUANTUM KEY-DISTRIBUTION
QUANTUM KEY-DISTRIBUTION
QUANTUM KEY-DISTRIBUTION
QUANTUM KEY-DISTRIBUTION
a.
Furnished with keys; as, a keyed instrument; also, set to a key, as a tune.
n.
A key or scale closely related to another as principal; a relative or attendant key. [R.] See Attendant keys, under Attendant, a.
n.
An instrument which is turned like a key in fastening or adjusting any mechanism; as, a watch key; a bed key, etc.
n.
Quantity; amount.
v. t.
To form a key seat, as by cutting. See Key seat, under Key.
a.
Cold as a metallic key; lifeless.
n.
A quantic of the fifth degree. See Quantic.
n. pl.
See Kie, Ky, and Kine.
n.
A key for opening more locks than one; a master key.
n.
See Key way, under Key.
n.
An indehiscent, one-seeded fruit furnished with a wing, as the fruit of the ash and maple; a samara; -- called also key fruit.
n.
A latch key.
n.
A family of tones whose regular members are called diatonic tones, and named key tone (or tonic) or one (or eight), mediant or three, dominant or five, subdominant or four, submediant or six, supertonic or two, and subtonic or seven. Chromatic tones are temporary members of a key, under such names as " sharp four," "flat seven," etc. Scales and tunes of every variety are made from the tones of a key.
p. pr. & vb. n.
of Key
n.
A position or condition which affords entrance, control, pr possession, etc.; as, the key of a line of defense; the key of a country; the key of a political situation. Hence, that which serves to unlock, open, discover, or solve something unknown or difficult; as, the key to a riddle; the key to a problem.
v. t.
To fasten or secure firmly; to fasten or tighten with keys or wedges.
n.
A definite portion of a manifoldness, limited by a mark or by a boundary.
pl.
of Quantum
n.
That part of an instrument or machine which serves as the means of operating it; as, a telegraph key; the keys of a pianoforte, or of a typewriter.
imp. & p. p.
of Key