substitution cipher
[/ˌsʌbstɪˈtuːʃən ˈsaɪfər/]
nounpl: substitution ciphers
cifra de substituição
1. An encryption method in which each letter or character in plaintext is replaced by another letter or character according to a fixed mapping or key
The Caesar cipher is one of the simplest examples of a substitution cipher, where each letter is shifted by a fixed number of positions in the alphabet.
A cifra de César é um dos exemplos mais simples de cifra de substituição, onde cada letra é deslocada por um número fixo de posições no alfabeto.
2. A cryptographic technique where the relationship between plaintext and ciphertext remains constant throughout the encryption process
In a substitution cipher, if 'A' maps to 'X', then every 'A' in the message will be encoded as 'X'.
Em uma cifra de substituição, se 'A' é mapeado para 'X', então cada 'A' na mensagem será codificado como 'X'.
Substitution ciphers are fundamental to cryptography education in both Brazil and the United States. They are often taught in computer science, mathematics, and security courses as historical examples of encryption methods. While superseded by modern algorithms, they remain important for understanding cryptographic principles. In popular culture, they appear in puzzle games and mystery narratives in both English and Portuguese-speaking contexts.
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