key

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Key

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Ernst A.H., Swedish anatomist and physician, 1832-1901. See: foramen of Key-Retzius, sheath of Key and Retzius.
Farlex Partner Medical Dictionary © Farlex 2012

key

a character of special significance in an organism. Such characters are used in a system for determining the identity of an organism on the basis of the presence or absence of a succession of characters. Usually such keys are DICHOTOMOUS (2); that is to say, at each step there is a choice between two possibilities. Keys, however, may have more than two characters at each step and there is a gradual elimination of absent characters until identification is made.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Note that (1) the 8-bit grayscale image Lena of size 256x256 pixels is used; (2) the speed of each image encryption/decryption system excludes that of key stream generator; (3) the scheme of AES uses a secret key of length 256 bits [25]; (4) the scheme in [27] uses a secret key of length 256 bits; (5) the scheme in [28] uses three double-precision floating-point numbers as the secret key (equivalent to the key length of 140 bits); (6) the scheme in [29] uses four double-precision floating-point numbers as the secret key (equivalent to the key length of 186 bits); (7) the values of NPCR and UACI are the average values of 100 tests.
One advantage of using the proposed algorithm compared to the previous algorithm, for example in [17], is that its flexibility to choose the secret key length. Fig.
(3) The encryption and decryption support very long key, and the influence of the key length to the compression/encryption time can be ignored.
In AES, each 128-bit data block undergoes 10-14 rounds (depending on key length) of permutations, substitutions, and additions [1].
The design and strength of all key lengths of the AES algorithm are sufficient to protect classified information.
In IDEA, the block length is 64-bit and master key length is 128-bit.
Equation (7) is written such that 90 % of results obtained are greater than the desired final key length (A) while remaining very close to this value, as shown in Fig.
DES cipher is generally considered unsafe due to its key length which is only 56 bits, making brute force attack on cipher feasible.
Encryption can be done by different methods depending on the algorithm and key length.
When a key length is 256 bits, the cipher key space is [2.sup.256] [approximately equal to] 1.16 * [10.sup.77].) It can achieve the confidential requirement.
The TMP exception applies to symmetric commercial-grade encryption with a key length of fewer than 64 bits.