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Number of bits in a key used by a cryptographic algorithm
In cryptography, key size or key length refers to the number of bits in a key used by a cryptographic algorithm (such as a cipher). Key length defines the
Key_size
Algorithm
symmetric-key encryption algorithms are usually better for bulk encryption. With the exception of the one-time pad they have a smaller key size, which means
Symmetric-key_algorithm
Used for encoding or decoding ciphertext
A key's security strength is dependent on its algorithm, the size of the key, the generation of the key, and the process of key exchange. The key is
Key_(cryptography)
Disk encryption software
(LUKS1) or 32 (LUKS2) encryption keys to be stored along with encryption parameters such as cipher type and key size. The presence of this header is a
Linux_Unified_Key_Setup
Standard for the encryption of electronic data
different key and block sizes. For AES, NIST selected three members of the Rijndael family, each with a block size of 128 bits, but three different key lengths:
Advanced_Encryption_Standard
Keyboard modifier key
combined with the Alt key due to restricted keyboard size. It is also found on many full-sized "multimedia" keyboards as the F-Lock key. Typically, in a compact
Fn_key
Practice and study of secure communication techniques
with typical key sizes. As a result, public-key cryptosystems are commonly hybrid cryptosystems, in which a fast high-quality symmetric-key encryption algorithm
Cryptography
Algorithm for encrypting and decrypting information
search for a key (i.e., "brute force" attack) substantially. Key size, i.e., the size of key used to encrypt a message. As the key size increases, so
Cipher
Method of exchanging cryptographic keys
Diffie–Hellman (DH) key exchange is a mathematical method of securely generating a symmetric cryptographic key over a public channel and was one of the
Diffie–Hellman_key_exchange
Algorithm for public-key cryptography
theory Diffie–Hellman key exchange Digital Signature Algorithm Elliptic-curve cryptography Key exchange Key management Key size Public-key cryptography Rabin
RSA_cryptosystem
Driver for hexagonal socketed bolts or screws
are usually sold in kits that include a variety of sizes. Key length typically increases with size but not necessarily proportionally so. Variants on
Hex_key
Early unclassified symmetric-key block cipher
short 56-bit key size. In January 1999, distributed.net and the Electronic Frontier Foundation collaborated to publicly break a DES key in 22 hours and
Data_Encryption_Standard
Cryptography secured against quantum computers
algorithm does speed up attacks against symmetric ciphers, doubling the key size can effectively counteract these attacks. Thus post-quantum symmetric cryptography
Post-quantum_cryptography
System that can issue, distribute and verify digital certificates
A public key infrastructure (PKI) is a set of roles, policies, hardware, software and procedures used to create, manage, distribute, use, store and revoke
Public_key_infrastructure
Cryptanalytic method for unauthorized users to access data
with increasing key size, not linearly. Although U.S. export regulations historically restricted key lengths to 56-bit symmetric keys (e.g. Data Encryption
Brute-force_attack
Block cipher
and 3DES encryption algorithms. This CVE, combined with the inadequate key size of 3DES, led to NIST deprecating 3DES in 2019 and disallowing all uses
Triple_DES
Block cipher
of the design include key-dependent S-boxes and a highly complex key schedule. Blowfish has a 64-bit block size and a variable key length from 32 bits up
Blowfish_(cipher)
Key on many computer keyboards
key is commonly found on desktop and laptop keyboards. The key has the opposite effect of the End key. In limited-size keyboards where the Home key is
Home_key
Email authentication method designed to associate a domain with a message stream
key sizes (from 512–2048 to 1024–4096). RFC 8463 was issued in September 2018. It adds an elliptic curve algorithm to the existing RSA. The added key
DomainKeys_Identified_Mail
Mathematical scheme for verifying the authenticity of digital documents
a sender known to the recipient. Digital signatures are a type of public-key cryptography, and are commonly used for software distribution, financial
Digital_signature
Hardware authentication device by Yubico
March 2026[update], the YubiKey range includes a number of devices that support the FIDO2 authentication standard and come in various sizes and interface formats
YubiKey
Cryptography algorithm
independently with the same key. Block ciphers may be capable of operating on more than one block size, but during transformation the block size is always fixed.
Block cipher mode of operation
Block_cipher_mode_of_operation
Length of ciphertext needed to unambiguously break a cipher
assumptions about the size of the key and the number of possible messages, there is an average ciphertext length where there is only one key (on average) that
Unicity_distance
Key on many computer keyboards
The End key is a key commonly found on desktop and laptop keyboards. The key has the opposite effect of the Home key. In some limited-size keyboards where
End_key
Measure of cryptographic strength
AES-128 (key size 128 bits) is designed to offer a 128-bit security level, which is considered roughly equivalent to a RSA using 3072-bit key. In this
Security_level
Family of block ciphers
variety of block and key sizes. A block is always two words, but the words may be 16, 24, 32, 48 or 64 bits in size. The corresponding key is 2, 3 or 4 words
Speck_(cipher)
Attempts to limit access to strong cryptography
planned by IBM to have a key size of 128 bits; the NSA lobbied for a key size of 48 bits. The end compromise were a key size of 64 bits, 8 of which were
Crypto_Wars
Digital rights management system used for DVD Video discs
have 56-bit and 128-bit key sizes, respectively, providing a much higher level of security than the less secure 40-bit key size of CSS. The Content Scramble
Content_Scramble_System
Computer communications authentication algorithm
computeBlockSizedKey(key, hash, blockSize) o_key_pad ← block_sized_key xor [0x5c blockSize] // Outer padded key i_key_pad ← block_sized_key xor [0x36 blockSize] // Inner
HMAC
Measures to determine proper bra fit
Bra size (also known as brassiere measurement or bust size) indicates the characteristics of a bra to accurately fit the breasts. While there are multiple
Bra_size
Cryptographic attack
the key. While the number of '1' bits alone is not nearly enough information to make finding the key easy, repeated executions with the same key and different
Timing_attack
Type of cipher
decryption, D. Both algorithms accept two inputs: an input block of size n bits and a key of size k bits; and both yield an n-bit output block. The decryption
Block_cipher
Multiparty cryptographic process
Distributed key generation (DKG) is a cryptographic process in which multiple parties contribute to the calculation of a shared public and private key set. Unlike
Distributed_key_generation
Block cipher
AES: 128-bit block size with key size of 128, 192, or 256 bits. The number of rounds is 12, 14, or 16, depending on the key size. ARIA uses two 8×8-bit
ARIA_(cipher)
Block cipher
In cryptography, Twofish is a symmetric key block cipher with a block size of 128 bits and key sizes up to 256 bits. It was one of the five finalists of
Twofish
Length of bit string processed by a cipher
Rijndael, supports block and key sizes of 128, 192, and 256 bits, but in AES the block size is always 128 bits. The extra block sizes were not adopted by the
Block_size_(cryptography)
Project by NIST to standardize post-quantum cryptography
Retrieved 31 January 2019. RSA using 231 4096-bit primes for a total key size of 1 TiB. "Key almost fits on a hard drive" Bernstein, Daniel (28 May 2010). "McBits
NIST Post-Quantum Cryptography Standardization
NIST_Post-Quantum_Cryptography_Standardization
Authenticated encryption mode for block ciphers
lifetime of the key. Appendix C in NIST SP 800-38D provides guidance for these constraints (for example, if t = 32 and the maximal packet size is 210 bytes
Galois/Counter_Mode
Elliptic curve used in Internet cryptography
offering 128 bits of security (256-bit key size) and designed for use with the Elliptic-curve Diffie–Hellman (ECDH) key agreement scheme, first described and
Curve25519
Cryptography construction
identical in some cases, requiring only a reversal of the key schedule. Therefore, the size of the code or circuitry required to implement such a cipher
Feistel_cipher
Process of developing the AES standard
implemented in software. While Triple-DES avoids the problem of a small key size, it is very slow even in hardware, it is unsuitable for limited-resource
Advanced Encryption Standard process
Advanced_Encryption_Standard_process
Block cipher
notably, it suffers from equivalent keys—each key is equivalent to three others, which means that the effective key size is only 126 bits. As a result, TEA
Tiny_Encryption_Algorithm
Approach to public-key cryptography
such as RSA is a smaller key size, reducing storage and transmission requirements. For example, a 256-bit elliptic curve public key should provide comparable
Elliptic-curve_cryptography
Algorithm for modelling sequential data
vector is query size d query {\displaystyle d_{\text{query}}} and similarly for the key size d key {\displaystyle d_{\text{key}}} and value size d value {\displaystyle
Transformer_(deep_learning)
Tables for the Data Encryption Standard
combined to form a 56 bit temp-key again • The compression P-box changes the 56 bits key to 48 bits key, which is used as a key for the corresponding round
DES_supplementary_material
Post-quantum digital signature scheme
EUROCRYPT 2015. SPHINCS features a larger 1kB public and private key size and a 41kB signature size. SPHINCS+ was first released in 2017 since SPHINCS suffers
SPHINCS+
Digital signature scheme
r_{v}\in G} . Choose a private signing key x {\displaystyle x} from the allowed set. The public verification key is y = g − x {\displaystyle y=g^{-x}}
Schnorr_signature
Earliest civilian block ciphers
after the National Security Agency reduced the cipher's key size to 56 bits, reduced the block size to 64 bits, and made the cipher resistant against differential
Lucifer_(cipher)
Protective glaze for paper or fabric
Sizing or size is a substance that is applied to, or incorporated into, other materials—especially papers and textiles—to act as a protective filler or
Sizing
Keyboard key often used for tabulated formatting
allows the user to choose options related to a tab-key press. Typically, this involves setting the size of tab stops in terms of a number of spaces and whether
Tab_key
Mechanism for authenticating cryptographic keys
between a public key and its owner. Its decentralized trust model is an alternative to the centralized trust model of a public key infrastructure (PKI)
Web_of_trust
Block cipher
64-bit block size and a key size of between 40 and 128 bits (but only in 8-bit increments). The full 16 rounds are used when the key size is longer than
CAST-128
Algorithm that calculates all the round keys from the key
the cipher key called a round key. A key schedule is an algorithm that calculates all the round keys from the key. Some ciphers have simple key schedules
Key_schedule
Block cipher
Knudsen. Like other AES submissions, Serpent has a block size of 128 bits and supports a key size of 128, 192, or 256 bits. The cipher is a 32-round
Serpent_(cipher)
Short sequence of bytes used to authenticate or look up a longer public key
of key authentication data. For example, if key authentication data needs to be transmitted through a protocol or stored in a database where the size of
Public_key_fingerprint
Technique to increase the security of an iterated block cipher
increase the complexity of a brute-force attack, increasing the effective size of the key without major changes in the algorithm. DES-X's inventor, Ron Rivest
Key_whitening
Family of authenticated ciphers
of SHA-2. The ciphers are parameterizable by the key length k (up to 128 bits), "rate" (block size) r, and two numbers of rounds a, b. All algorithms
Ascon_(cipher)
Non-comparative lexicographical sorting algorithm
concatenate the groups in size order. MSD sorts must effectively 'extend' all shorter keys to the size of the largest key and sort them accordingly,
Radix_sort
Block cipher
documentation says simply RC6. RC6 proper has a block size of 128 bits and supports key sizes of 128, 192, and 256 bits up to 2040-bits, but, like RC5
RC6
Term applied to cryptographic systems that are highly resistant to cryptanalysis
a sufficiently long key and be free of known mathematical weaknesses, as exploitation of these effectively reduces the key size. At the beginning of
Strong_cryptography
Chinese block cipher
cipher has a key size and a block size of 128 bits each. Encryption or decryption of one block of data is composed of 32 rounds. A non-linear key schedule
SM4_(cipher)
Soviet/Russian national standard block cipher
28147-89, is a Soviet and Russian government standard symmetric key block cipher with a block size of 64 bits. The original standard, published in 1989, did
GOST_(block_cipher)
Adding data to a message prior to encryption to hide its length
PCBC essentially) for symmetric-key encryption algorithms require plain text input that is a multiple of the block size, so messages may have to be padded
Padding_(cryptography)
Quantum-safe key encapsulation mechanism
lattice-based methods, e.g. in regard to runtime as well as the size of the ciphertexts and the key material. Variants with different security levels have been
ML-KEM
Concept in locksmithing
and how similar the two keys are in size and shape. It can also refer to the measurable difference between a key and the size required to fit and operate
Key_relevance
Non-federated cryptographic protocol
prekeys (i.e., one-time ephemeral public keys that have been uploaded in advance to a central server), and key agreement protocols including the original
Signal_Protocol
Input to a cryptographic primitive
encryption schemes, the unpredictable part of the IV has at best the same size as the key to compensate for time/memory/data tradeoff attacks. When the IV is
Initialization_vector
incorporated into many national and organizational standards. However, its 56-bit key-size has been shown to be insufficient to guard against brute force attacks
History_of_cryptography
Data input device
duplicate keys and ones seldom used. Function- and arrow keys are nearly always present. Another factor determining the size of a keyboard is the size and spacing
Computer_keyboard
Cryptographic algorithm for digital signatures
elliptic-curve cryptography in general, the bit size of the private key believed to be needed for ECDSA is about twice the size of the security level, in bits. For
Elliptic Curve Digital Signature Algorithm
Elliptic_Curve_Digital_Signature_Algorithm
How often identical letters appear in the same position in two texts
guessed the key size (number of columns), the aggregate delta I.C. should be around 1.00. So we compute the delta I.C. for assumed key sizes from one to
Index_of_coincidence
Cryptographic method
signature size of 666 bytes and a public key size of 897 bytes for the NIST security level 1 (security comparable to breaking AES-128 bits). The key generation
Falcon_(signature_scheme)
Key agreement protocol
{\displaystyle [0,p)} of size ( n + 1 ) / 2 {\displaystyle (n+1)/2} . For this reason, the secret should not be used directly as a symmetric key, but it can be
Elliptic-curve_Diffie–Hellman
Drawing that defines the starting and ending points of any smooth transition
period of time, that could be achieved by using key frames. At the start of the animation, a beam size value is set. Another value is set for the end of
Key_frame
International airport in Key West, Florida
the main commercial center of Key West. The relatively short 5,076-foot-long (1,547 m) runway limits the maximum size of aircraft that can serve the
Key West International Airport
Key_West_International_Airport
Feistel network based block cipher
In cryptography, Camellia is a symmetric key block cipher with a block size of 128 bits and key sizes of 128, 192 and 256 bits. It was jointly developed
Camellia_(cipher)
Post-quantum cryptographic algorithm
boasted one of the smallest key sizes of all post-quantum key exchanges; with compression, SIDH used 2688-bit public keys at a 128-bit quantum security
Supersingular isogeny key exchange
Supersingular_isogeny_key_exchange
Concept in cryptography
typical public key size is 32 bytes. The validity of this global public key is related to the validity of a given one-time public key using a sequence
Hash-based_cryptography
Block cipher
size (32, 64 or 128 bits), key size (0 to 2040 bits), and number of rounds (0 to 255). The original suggested choice of parameters were a block size of
RC5
Cryptographic key management algorithm
Double Ratchet Algorithm (previously referred to as the Axolotl Ratchet) is a key management algorithm that was developed by Trevor Perrin and Moxie Marlinspike
Double_Ratchet_Algorithm
Asymmetric encryption algorithm developed by Robert McEliece
an attack and a fix. Another paper shows that for quantum computing, key sizes must be increased by a factor of four due to improvements in information
McEliece_cryptosystem
Post-quantum digital signature scheme
the Fiat–Shamir transform. It promises small key sizes between 64 and 128 bytes and small signature sizes between 177 and 335 bytes, which outperforms
SQIsign
Island and city in Florida, United States
its outlying Florida Keys archipelago. Together with all or parts of the separate islands of Dredgers Key, Fleming Key, Sunset Key, and the northern part
Key_West
Computer function
murmur3_32(const uint8_t* key, size_t len, uint32_t seed) { uint32_t h = seed; uint32_t k; /* Read in groups of 4. */ for (size_t i = len >> 2; i; i--)
MurmurHash
Family of lightweight block ciphers
dependent on the implementation of 2, 3 or 4 keys. Simon supports the following combinations of block sizes, key sizes and number of rounds: Let S j {\displaystyle
Simon_(cipher)
General form of cryptanalysis applicable primarily to block ciphers
key. When one round key has been deemed a potential round key considerably more often than any other key, it is assumed to be the correct round key.
Differential_cryptanalysis
Block cipher
block size and a variable key size of either 128, 192, or 256 bits; with 128-bit and 192-bit keys it applies 6 rounds, or 8 rounds with 256-bit keys. It
DEAL
Cryptographic hardware
cipher's key space – that is, to decrypt an encrypted message by trying every possible key. The aim in doing this was to prove that the key size of DES
EFF_DES_cracker
Sorting algorithm
parallel radix sort algorithm, the key size (base of the radix representation) should be chosen to match the size of the split subarrays. The simplicity
Counting_sort
Deprecated security algorithm for wireless networks
the key size. Once the restrictions were lifted, manufacturers of access points implemented an extended 128-bit WEP protocol using a 104-bit key size (WEP-104)
Wired_Equivalent_Privacy
Cryptographic system with public and private keys
Public-key cryptography, or asymmetric cryptography, is the field of cryptographic systems that use pairs of related keys. Each key pair consists of a
Public-key_cryptography
Computer hardware technology that uses quantum mechanics
algorithm to that AES-128 has against classical brute-force search (see Key size). The most well-known example of a problem that allows for a polynomial
Quantum_computing
key size for a discussion of this and other lengths. Authentication key - Key used in a keyed-hash message authentication code, or HMAC. Benign key -
Glossary of cryptographic keys
Glossary_of_cryptographic_keys
Block cipher
block cipher. It supports block sizes of 128, 256 or 512 bits; the key length is either equal to or double the block size. Kalyna was adopted as the national
Kalyna_(cipher)
Proposed web cryptography standard
algorithms (avoid depending on the alg field alone) Use an appropriate key size Several JWT libraries were found to be vulnerable to an invalid Elliptic-curve
JSON_Web_Token
Block cipher
{\mbox{DES}}_{K}(M\oplus K_{1})} The key size is thereby increased to 56 + (2 × 64) = 184 bits. However, the effective key size (security) is only increased to
DES-X
Study of analyzing information systems in order to discover their hidden aspects
21st century, 150-digit numbers were no longer considered a large enough key size for RSA. Numbers with several hundred digits were still considered too
Cryptanalysis
Cryptographic signature scheme
each number being 256 bits in size, that is, a total of 2×256×256 bits = 128 Kibit in total. This is her private key, and she will store it away in a
Lamport_signature
Cryptographic attack
known key, where the input and output have s least significant bits set to zero, in less than 2s time (where s is fewer than half the block size). These
Known-key distinguishing attack
Known-key_distinguishing_attack
Body variation
Cephalopods, which include squids and octopuses, vary enormously in size. The smallest are only about 1 centimetre (0.39 in) long and weigh less than 1
Cephalopod_size
KEY SIZE
KEY SIZE
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.
Boy/Male
Muslim/Islamic
Key
Surname or Lastname
English and Scottish
English and Scottish : variant of Kay.
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.
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
Christian, Gaelic, Indian
The One who Opens the Lock
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
Boy/Male
Arabic, Muslim
Key; Opener
Boy/Male
Muslim
Key
Boy/Male
Indian
Key
Boy/Male
Indian, Sanskrit, Tamil
Key; Love
Male
Turkish
Turkish name GÖKER means "man of the sky."
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
Gaelic
Son of Aidan.
Surname or Lastname
English and German
English and German : variant of Kay.Irish : reduced form of McKay.
Boy/Male
Bengali, English, Indian, Sindhi
Key
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.
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.
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."
KEY SIZE
KEY SIZE
Boy/Male
Hindu, Indian
Space; Sky
Boy/Male
Hindu
Son of the right hand
Girl/Female
German, Hebrew, Polish
Peace
Surname or Lastname
English
English : habitational name from any of the places called Pulham, in Dorset, Norfolk, or Devon. The first two are named with Old English pÅl or pull ‘pool’ + hÄm ‘homestead’, ‘settlement’ or hamm ‘river meadow’, ‘land surrounded by water’.
Boy/Male
Indian
Attractive, Beloved, Mistress
Girl/Female
Muslim
One having good qualities, Nature & habits
Surname or Lastname
English
English : habitational name from the city of Worcester, named from Old English ceaster ‘Roman fort or walled city’ (Latin castra ‘legionary camp’) + a British tribal name of uncertain origin.Rev. William Worcester emigrated from England and settled in Salisbury, MA, before 1638. He had many prominent descendants, including Noah Worcester (b. 1758) and Samuel Worcester (b. 1770), both NH Congregational clergymen, and Joseph Emerson Worcester (1784–1865), a noted lexicographer, geographer, and historian.
Boy/Male
Indian, Sanskrit
Literary Composition; Energy; Ability
Boy/Male
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Happy; Kind
Girl/Female
American, Arabic, Chinese, French, Hawaiian, Hebrew, Latin
Friend; Worthy; Suitable
KEY SIZE
KEY SIZE
KEY SIZE
KEY SIZE
KEY SIZE
n.
An indehiscent, one-seeded fruit furnished with a wing, as the fruit of the ash and maple; a samara; -- called also key fruit.
v. t.
To form a key seat, as by cutting. See Key seat, under Key.
n.
An instrument which is turned like a key in fastening or adjusting any mechanism; as, a watch key; a bed key, etc.
imp. & p. p.
of Key
v. t.
To fasten or secure firmly; to fasten or tighten with keys or wedges.
n.
A key; a glossary.
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.
n.
See Key, a ledge.
n. pl.
See Kie, Ky, and Kine.
n.
A latch key.
v. t.
To change the key of.
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.
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.
a.
Cold as a metallic key; lifeless.
n.
A key or scale closely related to another as principal; a relative or attendant key. [R.] See Attendant keys, under Attendant, a.
a.
Furnished with keys; as, a keyed instrument; also, set to a key, as a tune.
n.
A key for opening more locks than one; a master key.
n.
See Key way, under Key.