“cipher”的概念、定义、翻译、参考文献-科学参考

cipher

Mathematics

A primitive means of encrypting a message—the 26 letters of the alphabet are permuted and every occurrence of a particular letter in a text is substituted for its replacement to make the ciphertext. A very basic example is Caesar ciphers, where each letter is shifted by some fixed amount to find its replacement, for example ABCD…being replaced by RSTU…. Even though there are 26! > 4×10²⁶ ciphers, frequency analysis can quickly reduce the possibilities, and so ciphers are easy to decrypt.
An old term for zero or the digit 0.

Computer

1. An algorithm employed for encryption, or, in its inverse form, for decryption. See cryptography.
2. An encrypted message.

Internet

The set of rules which is used to change a text—the plain text—into a form which cannot be read by an unauthorized person. The process of applying the rules is known as encryption. A cipher is also used to change an enciphered text into the associated plain text.

Electronics and Electrical Engineering

An algorithm used for encryption of information or, in its inverse form, for decryption. It is one of the earliest forms of encryption. Used by Julius Caesar during the Gallic wars, Caesar cipher employed a simple alphabetic shift in which the transmitted letter was the desired letter shifted a number of places in the alphabet. For example, to transmit ‘many’ using a two-letter shift results in the transmission of ‘ocpa’ – each letter is shifted two places along the alphabet with wrap around at z. To decrypt the code all that is required is the number of shifts.

单词	cipher
释义	cipher Mathematics A primitive means of encrypting a message—the 26 letters of the alphabet are permuted and every occurrence of a particular letter in a text is substituted for its replacement to make the ciphertext. A very basic example is Caesar ciphers, where each letter is shifted by some fixed amount to find its replacement, for example ABCD…being replaced by RSTU…. Even though there are 26! > 4×10²⁶ ciphers, frequency analysis can quickly reduce the possibilities, and so ciphers are easy to decrypt. An old term for zero or the digit 0. Computer 1. An algorithm employed for encryption, or, in its inverse form, for decryption. See cryptography. 2. An encrypted message. Internet The set of rules which is used to change a text—the plain text—into a form which cannot be read by an unauthorized person. The process of applying the rules is known as encryption. A cipher is also used to change an enciphered text into the associated plain text. Electronics and Electrical Engineering An algorithm used for encryption of information or, in its inverse form, for decryption. It is one of the earliest forms of encryption. Used by Julius Caesar during the Gallic wars, Caesar cipher employed a simple alphabetic shift in which the transmitted letter was the desired letter shifted a number of places in the alphabet. For example, to transmit ‘many’ using a two-letter shift results in the transmission of ‘ocpa’ – each letter is shifted two places along the alphabet with wrap around at z. To decrypt the code all that is required is the number of shifts.
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