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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
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
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
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
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
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
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)
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
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
Block cipher
Threefish is a symmetric-key tweakable block cipher designed as part of the Skein hash function, an entry in the NIST hash function competition. Threefish
Threefish
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
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
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
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)
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
Keyboard key meant for Windows devices
The Windows key (also known as the win, start, logo, flag or super key) is a computer keyboard key originally introduced on Microsoft's Natural Keyboard
Windows_key
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
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
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
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
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
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
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
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
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
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
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
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
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
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)
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
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
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
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
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
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)
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
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
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
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
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
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
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
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)
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
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
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
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
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
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)
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)
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
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)
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)
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
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
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
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
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
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
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
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
Transient-key cryptography is a form of public-key cryptography wherein keypairs are generated and assigned to brief intervals of time instead of to individuals
Transient-key_cryptography
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
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
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
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
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
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)
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)
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
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
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
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
Type of cryptographic attack
a related-key attack is any form of cryptanalysis where the attacker can observe the operation of a cipher under several different keys whose values
Related-key_attack
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
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+
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
Block cipher
variable, including the block size and key size, which are equal, as well as the number of rounds. In addition to the key, it also makes use of an odd
Xmx
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
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)
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)
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
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
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
Machine element used to connect a rotating element to a shaft
media related to Keys and keyways. Standard Metric Keys & Keyways Archived 2021-02-14 at the Wayback Machine ASME recommended key sizes for inch based units
Key_(engineering)
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
didn't specify any key schedule for the cipher, but it uses a total key size of 256 bits. Kidney, Heys, and Norvell showed that round keys of low Hamming
CIKS-1
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
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
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
Concept in cryptography
sufficient size were built, all of the public key algorithms based on these three classically hard problems would be insecure. This public key cryptography
Ring learning with errors key exchange
Ring_learning_with_errors_key_exchange
Block cipher
block sizes of 64, 96, and 128 bits. The key size is twice the block size. The number of rounds is 8.5, 10.5, or 12.5, depending on the block size. The
MESH_(cipher)
Digital signature scheme
elements of G 1 {\displaystyle G_{1}} , public keys are elements of G 2 {\displaystyle G_{2}} , and the secret key is an integer in [ 0 , q − 1 ] {\displaystyle
BLS_digital_signature
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
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