secret writing

• Método de codificar ou ocultar informações para que apenas os destinatários pretendidos possam lê-las, frequentemente associado à criptografia ou à esteganografia.

A method of encoding or concealing information so that only intended recipients can read it, often associated with cryptography or steganography.

1. CryptographyB2formal

   The practice of writing messages in a code or cipher so that only the intended recipient can read them.

   Criptografia

   • Secret writing was used by spies during the war.
   • The ancient Egyptians used hieroglyphs as a form of secret writing.
   • Modern secret writing relies on complex algorithms.

2. Invisible inkB1informal

   A substance used for writing that is invisible until it is treated with a chemical or heat.

   Tinta invisível

   • The children used lemon juice for secret writing.
   • The spy wrote a message in secret writing using invisible ink.
   • Secret writing can be revealed by holding the paper over a flame.