1. Methods or techniques used to encode and decode secret messages by substituting or rearranging letters or characters
Ancient cipher systems like the Caesar cipher were used for military communications.
Sistemas de criptografia antigos como a cifra de César eram usados para comunicações militares.
2. Cryptographic algorithms and protocols designed to ensure confidentiality and security of information
Modern cipher systems employ complex mathematical algorithms to protect digital data.
Sistemas de criptografia modernos usam algoritmos matemáticos complexos para proteger dados digitais.