AES is a variant of Rijndael which has a fixed block size of 128 bits, and a key size of 128, 192, or 256 bits.

For each round, a subkey is derived from the main key using Rijndael's key schedule ; each subkey is the same size as the state.

Blowfish has a 64-bit block size and a variable key length from 32 bits up to 448 bits.

A block cipher consists of two paired algorithms, one for encryption, E, and the other for 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.

which takes as input a key K of bit length k, called the key size, and a bit string P of length n, called the block size, and returns a string C of n bits.

* Key size, i. e., the size of key used to encrypt a message.

As the key size increases, so does the complexity of exhaustive search to the point where it becomes impractable to crack encryption directly.

In cryptography, key size or key length is the size measured in bits of the key used in a cryptographic algorithm ( such as a cipher ).

For example, Triple DES has a key size of 168 bits but provides at most 112 bits of security, since an attack of complexity 2 < sup > 112 </ sup > is known.

There was speculation at the time, however, that the NSA has deliberately reduced the key size from the original value of 112 bits ( in IBM's Lucifer cipher ) or 64 bits ( in one of the versions of what was adopted as DES ) so as to limit the strength of encryption available to non-US users.

The Advanced Encryption Standard published in 2001 uses a key size of ( at minimum ) 128 bits.

" The general consensus is that these public key algorithms are insecure at any key size if sufficiently large quantum computers capable of running Shor's algorithm become available.

The algorithm described by AES is a symmetric-key algorithm, meaning the same key is used for both encrypting and decrypting the data.

The Book of Amos contains several different key activities and genres which are used to expound upon its themes.

Originally used in Baker House to signify the Ivy League university tradition, on his return to Finland Aalto used it in a number of key buildings, in particular, in several of the buildings in the new Helsinki University of Technology campus ( starting in 1950 ), Säynatsalo Town Hall ( 1952 ), Helsinki Pensions Institute ( 1954 ), Helsinki House of Culture ( 1958 ), as well as in his own summer house, the so-called Experimental House in Muuratsalo ( 1957 ).

The keyboard included a form of Single-key keyword input, similar to that used on the Sinclair Spectrum, via the ' func ' key.

* The ANS key on some graphing calculators, used as a shortcut for inputting the result ( answer ) of the previous calculation

In one application, it is actually a benefit: the password-hashing method used in OpenBSD uses an algorithm derived from Blowfish that makes use of the slow key schedule ; the idea is that the extra computational effort required gives protection against dictionary attacks.

The key index used to assess passenger train performance is the Public Performance Measure, which combines figures for punctuality and reliability.

A standard telegraph key has a built-in knife switch that can be used to short the key's contacts.

On personal computers, the key can be used by software in several different ways, such as to switch between multiple login sessions, to terminate a program, or to interrupt a modem connection.

* By whether the same key is used for both encryption and decryption ( symmetric key algorithms ), or if a different key is used for each ( asymmetric key algorithms ).

Modern encryption methods can be divided by two criteria: by type of key used, and by type of input data.

By type of key used ciphers are divided into:

* symmetric key algorithms ( Private-key cryptography ), where the same key is used for encryption and decryption, and

* asymmetric key algorithms ( Public-key cryptography ), where two different keys are used for encryption and decryption.

I have just asked these questions in the Pentagon, in the White House, in offices of key scientists across the country and aboard the submarines that prowl for months underwater, with neat rows of green launch tubes which contain Polaris missiles and which are affectionately known as `` Sherwood Forest ''.

Alternate locations exist for all key command centers.

It could reach key tactical points faster than infantry and destroy them or hold them as the case might be for the foot soldier.

When he was bent over behind the wheel of the station wagon, feeling in his trouser cuffs for the ignition key which he had dropped a moment before, she came out of the house with an enormous Rumanian shawl over her head, which she had bought in that country during one of their trips abroad, and handed him a clean handkerchief through the window.

The long-range objective is to bring about consolidation of ownership through use of land exchange authority and through purchase on a moderate scale of inholdings which comprise key tracts for recognized National Forest programs such as recreation development, or which are a source of damage to lands in National Forests and National Grasslands.

Some manufacturers have had the foresight to provide a socket for the chuck key ; ;

Called a `` Slo-Flo '' meter it was designed for this job by Power Plus Industries of Los Angeles, a key individual being Don Nelson.

Pulley had set her up at the Semiramis Hotel, but she grew impatient waiting for a royal reception and moved to a luxurious apartment to which the royal pimp had no key.

He found the key to the Jeep, got it started and warmed it up for five minutes.

Apparently he believes Mr. Buckley holds the key to the Democratic organization's acceptance of his choices for running mates without a struggle.

Now a quiet-spoken, middle-aged man, Fiedler is an aeronautical engineer for Lockheed's Missiles and Space Division at Sunnyvale, where he played a key role in the development of the Navy's Polaris missile.

A $25 billion advertising budget in an $800 billion economy was envisioned for the 1970s here Tuesday by Peter G. Peterson, head of one of the world's greatest camera firms, in a key address before the American Marketing Assn..

Nevertheless, the weak government created by the Articles became a matter of concern for key nationalists.

In The Plague, a key description of Oran occurs early, when it is explained that the town is built in such a way that it " turns its back on the bay, with the result that it's impossible to see the sea, you always have to go to look for it.

A key problem in the design of good algorithms for this problem is that formulas for the variance may involve sums of squares, which can lead to numerical instability as well as to arithmetic overflow when dealing with large values.

Like Jehovah's Witnesses, Adventists use key phrases from the Bible, such as " For the living know that they shall die: but the dead know not any thing, neither have they any more a reward ; for the memory of them is forgotten " ( Eccl.

The atomic orbital concept is therefore a key concept for visualizing the excitation process associated with a given transition.

During this operation, each column is multiplied by the known matrix that for the 128 bit key is

For cryptographers, a cryptographic " break " is anything faster than a brute force — performing one trial decryption for each key ( see Cryptanalysis ).

Symbolism as an art movement was in full swing at this time and L ' Ymagier provided a nexus for many of its key contributors.

The early 1960s and 1970s ( up until his death in 1976 ) were marked by key works in Helsinki, in particular the huge town plan for the void in centre of Helsinki adjacent to Töölö Bay and the vast railway yards, and marked on the edges by significant buildings such as the National Museum and the main railway station, both by Eliel Saarinen.

This key result opened the way for a proof of the Weil conjectures, ultimately completed by his student Pierre Deligne.