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- этимология
plaintext space - перевод на русский
![A right-handed three-dimensional [[Cartesian coordinate system]] used to indicate positions in space<!--(See diagram description for needed correction.)-->](https://commons.wikimedia.org/wiki/Special:FilePath/3D coordinate system.svg?width=200 "A right-handed three-dimensional [[Cartesian coordinate system]] used to indicate positions in space<!--(See diagram description for needed correction.)-->")
![[[Cartesian coordinate system]]](https://commons.wikimedia.org/wiki/Special:FilePath/Coord XYZ.svg?width=200 "[[Cartesian coordinate system]]")
![[[Cylindrical coordinate system]]](https://commons.wikimedia.org/wiki/Special:FilePath/Cylindrical Coordinates.svg?width=200 "[[Cylindrical coordinate system]]")
![[[Spherical coordinate system]]](https://commons.wikimedia.org/wiki/Special:FilePath/Spherical Coordinates (Colatitude, Longitude).svg?width=200 "[[Spherical coordinate system]]")
математика
трехмерное пространство
- cipher space
- cipher text space
- code space
- cryptogram space
- cryptographlc space
- decision space
- interblock space
- key space
- linear space
- linear vector space
- message space
- observation space
- parameter space
- password space
- plaintext space
- probability space
- protected space
- sampie space
- search space
- security space
- solution space
- time-frequency space
- vector space
- vector space of dimension n
Определение
Википедия
Plaintext-awareness is a notion of security for public-key encryption. A cryptosystem is plaintext-aware if it is difficult for any efficient algorithm to come up with a valid ciphertext without being aware of the corresponding plaintext.
From a lay point of view, this is a strange property. Normally, a ciphertext is computed by encrypting a plaintext. If a ciphertext is created this way, its creator would be aware, in some sense, of the plaintext. However, many cryptosystems are not plaintext-aware. As an example, consider the RSA cryptosystem without padding. In the RSA cryptosystem, plaintexts and ciphertexts are both values modulo N (the modulus). Therefore, RSA is not plaintext aware: one way of generating a ciphertext without knowing the plaintext is to simply choose a random number modulo N.
In fact, plaintext-awareness is a very strong property. Any cryptosystem that is semantically secure and is plaintext-aware is actually secure against a chosen-ciphertext attack, since any adversary that chooses ciphertexts would already know the plaintexts associated with them.
