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In cryptography, key size, key length, or key space refer to the number of bits in a key used by a cryptographic algorithm (such as a cipher). Key length defines the upper-bound on an algorithm's security (i.e. a logarithmic measure of the fastest known attack against an algorithm), since the security of all algorithms can be violated by brute-force attacks. Ideally, the lower-bound on an algorithm's security is by design equal to the key length (that is, the security is determined entirely by the keylength, or in other words, the algorithm's design does not detract from the degree of security inherent in the key length). Indeed, most symmetric-key algorithms are designed to have security equal to their key length. However, after design, a new attack might be discovered. For instance, Trip

Attributes	Values
rdf:type	organisation
rdfs:label	Key size (en) Délka klíče (cs) Schlüssellänge (de) Longitud de la clave (es) Ukuran kunci (in) Dimensione della chiave (it) Longueur de clé (fr) Tamanho da chave (pt) Размер ключа (ru) 密钥长度 (zh)
rdfs:comment	Die Schlüssellänge ist eine wichtige Eigenschaft kryptographischer Verfahren und bezeichnet ein logarithmisches Maß für die Anzahl der verschiedenen möglichen Schlüssel des Verfahrens. (de) En criptografía, la longitud de la clave o intensidad de cifrado es una medida del número de claves posibles que pueden usarse en un cifrador. Debido a que en la criptografía moderna se usan claves binarias, la longitud se especifica normalmente en bits. La longitud de la clave es crítica para determinar la susceptibilidad de un cifrador frente a un ataque de búsqueda exhaustivo. (es) Dalam kriptografi, ukuran kunci atau panjang kunci adalah jumlah bit kunci yang dipakai oleh algoritme kriptografi, misalnya sandi. Ukuran kunci menentukan batas atas keamanan algoritme, yaitu ukuran logaritma serangan tercepat yang diketahui, karena pada dasarnya semua keamanan algoritme dapat diterobos oleh serangan brutal. Idealnya, batas bawah keamanan algoritme secara desain sama dengan panjang kunci, yakni keamanannya ditentukan hanya oleh ukuran kunci. (in) Nella crittologia, la dimensione della chiave misura il numero di possibili chiavi utilizzabili per cifrare un messaggio. Dato che i moderni sistemi di cifratura utilizzano chiavi binarie, la lunghezza della chiave viene specificata in bit. La dimensione della chiave è un elemento critico, dato che una chiave troppo corta sarebbe esposta al rischio di "forzatura" tramite un attacco a forza bruta. (it) 在密码学中，密钥大小或密钥长度是加密算法（如密码）使用的密钥中的比特数。因为所有的算法都可能会被暴力破解法破解，所以密钥长度通常指出了一个加密算法的安全性上限（即相对于密钥长度的对数的最快已知攻击的量度）。理想情况下，密钥长度将与算法安全性的下界相一致。 (zh) Délka klíče označuje v kryptografii délku šifrovacího klíče příslušného šifrovacího algoritmu, která je uváděna v bitech. Délka klíče algoritmu je odlišná od jeho šifrovací bezpečnosti, která je logaritmickou mírou nejrychlejšího známého výpočetního útoku algoritmu, měří se v bitech. Bezpečnost algoritmu nemůže překročit jeho délku klíče (protože každý algoritmus může být prolomen hrubou silou), ale může být menší. Například Triple DES má velikost klíče 168 bitů, ale poskytuje nanejvýš 112 bitů, kvůli vlastnostem vícenásobného šifrování stejným algoritmem. Tato vlastnost Triple DES nemá slabost ve 112 bitech zabezpečení, pro aplikace je to dostačující. Nejvíce symetrických šifer pro běžné použití je navrženo tak, aby bezpečnost odpovídala délce klíče. Žádná asymetrická šifra s touto vlastn (cs) In cryptography, key size, key length, or key space refer to the number of bits in a key used by a cryptographic algorithm (such as a cipher). Key length defines the upper-bound on an algorithm's security (i.e. a logarithmic measure of the fastest known attack against an algorithm), since the security of all algorithms can be violated by brute-force attacks. Ideally, the lower-bound on an algorithm's security is by design equal to the key length (that is, the security is determined entirely by the keylength, or in other words, the algorithm's design does not detract from the degree of security inherent in the key length). Indeed, most symmetric-key algorithms are designed to have security equal to their key length. However, after design, a new attack might be discovered. For instance, Trip (en) En cryptologie, la longueur de clé (en anglais : Key size ou key length) est la taille mesurée en bits de la clé de chiffrement (ou de signature) utilisée par un algorithme de chiffrement. La longueur de la clé est différente de la sécurité cryptographique, qui est la mesure de l'attaque la plus rapide contre un algorithme, aussi mesurée en bits. (fr) Em criptografia, tamanho da chave ou comprimento da chave é o tamanho medido em bits da chave usada em um algoritmo criptográfico (tal como uma cifra). O comprimento de chave de um algoritmo é distinto de sua segurança criptográfica, que é uma medida logarítmica do ataque computacional mais rápido conhecido sobre o algoritmo, também medido em bits. A segurança de um algoritmo não pode exceder o seu comprimento de chave (já que qualquer algoritmo pode ser quebrado pela força bruta), mas pode ser menor. Por exemplo, Triple DES tem um tamanho de chave de 168 bits, mas fornece, no máximo, 112 bits de segurança, já que um ataque de complexidade 2112 é conhecido. Esta propriedade do Triple DES não é uma fraqueza dado que 112 bits de segurança é suficiente para uma aplicação. A maioria dos algor (pt) В криптографии и криптосистемах, разме́р ключа́ (также: длина ключа или пространство ключей) — это число бит в ключе, используемом в криптографических операциях, таких как шифрование и подписывание электронной цифровой подписью. Так, например, если указано, что криптосистема использует ключ шифрования размером 8 бит, это означает, что из 8 разрядов двоичного кода можно получить возможных комбинаций ключей, а, например, длина ключа в 256 бит подразумевает уже комбинаций. (ru)
dcterms:subject	Key management
Wikipage page ID	5749 (xsd:integer)
Wikipage revision ID	1121038453 (xsd:integer)
Link from a Wikipage to another Wikipage	Public key cryptography Quantum computer Export of cryptography in the United States Open-source movement Algorithm Deprecation EFF DES cracker Integer factorization Elliptic curve cryptography Quantum computer Symmetric-key algorithm Cryptography Elliptic-curve cryptography One-time pad Special number field sieve Plaintext Claude Shannon Gilles Brassard NSA Triple DES Shor's algorithm Commercial National Security Algorithm Suite Key (cryptography) Key stretching Space (mathematics) Transport Layer Security Auguste Kerckhoffs 56-bit encryption Brute-force attack Burt Kaliski Data Encryption Standard Whitfield Diffie Distributed.net Logjam (computer security) 40-bit encryption Advanced Encryption Standard Fortezza Diffie-Hellman Arjen Lenstra Key management Kerckhoffs' principle Large numbers Bit Martin Hellman Cipher Ciphertext Classified information in the United States Grover's algorithm Information theory National Institute of Standards and Technology National Security Agency RSA-250 RSA (algorithm) RSA (cryptosystem) RSA Security Security strength Secure Shell Skipjack (cipher) Computational security Lucifer (cipher) Password strength Secure Hash Algorithm Twofish Asymmetric-key algorithm Asymmetric key Level of security Discrete logarithm problem Perfect secrecy U.S. Bureau of Industry and Security
Link from a Wikipage to an external page	https://apj.emc.com/emc-plus/rsa-labs/historical/twirl-and-rsa-key-size.htm https://www.keylength.com/ http://citeseer.ist.psu.edu/lenstra99selecting.html https://web.archive.org/web/20140101053420/http:/www.synaptic-labs.com/resources/expert-opinions/94-quantum-computing.html http://csrc.nist.gov/groups/ST/toolkit http://csrc.nist.gov/publications/PubsSPs.html
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