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Chaffing and winnowing is a cryptographic technique to achieve confidentiality without using encryption when sending data over an insecure channel. The name is derived from agriculture: after grain has been harvested and threshed, it remains mixed together with inedible fibrous chaff. The chaff and grain are then separated by winnowing, and the chaff is discarded. The cryptographic technique was conceived by Ron Rivest and published in an on-line article on 18 March 1998. Although it bears similarities to both traditional encryption and steganography, it cannot be classified under either category.

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  • Spreu-und-Weizen-Algorithmus (de)
  • Chaffing and winnowing (en)
  • Protocolo de rellenado con paja y aventado (es)
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  • Spreu-und-Weizen-Algorithmus oder Chaffing and Winnowing (englisch für „mit Spreu versetzen und Windsichten“) bezeichnet einen Algorithmus zur Geheimhaltung beim Versenden von Daten, ohne dass die Daten dabei verschlüsselt werden müssen. Das Verfahren wurde im Jahr 1998 von Ronald L. Rivest vorgestellt und stellt eine Alternative zu Steganographie und Kryptographie dar. Die grundsätzliche Idee ist, die unterteilte geheime Nachricht wie Nadeln in einem Heuhaufen aus irrelevanten, aber ähnlich aussehenden Daten zu verbergen. (de)
  • Chaffing and winnowing is a cryptographic technique to achieve confidentiality without using encryption when sending data over an insecure channel. The name is derived from agriculture: after grain has been harvested and threshed, it remains mixed together with inedible fibrous chaff. The chaff and grain are then separated by winnowing, and the chaff is discarded. The cryptographic technique was conceived by Ron Rivest and published in an on-line article on 18 March 1998. Although it bears similarities to both traditional encryption and steganography, it cannot be classified under either category. (en)
  • Se dice que un protocolo criptográfico es un protocolo de rellenado con paja y aventado cuando utiliza la técnica añadiendo paja y aventando (traducción del inglés chaffing and winnowing). El nombre de esta técnica viene derivado de la agricultura: Cuando se recoge el cereal se obtiene un compuesto en el que está mezclado la paja (inútil) y el grano (útil). Para separar el grano de la paja se echa al aire el compuesto y el viento se lleva la paja separándola así del grano. A este proceso se le llama aventar (en inglés winnowing). (es)
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  • Chaffing and winnowing is a cryptographic technique to achieve confidentiality without using encryption when sending data over an insecure channel. The name is derived from agriculture: after grain has been harvested and threshed, it remains mixed together with inedible fibrous chaff. The chaff and grain are then separated by winnowing, and the chaff is discarded. The cryptographic technique was conceived by Ron Rivest and published in an on-line article on 18 March 1998. Although it bears similarities to both traditional encryption and steganography, it cannot be classified under either category. This technique allows the sender to deny responsibility for encrypting their message. When using chaffing and winnowing, the sender transmits the message unencrypted, in clear text. Although the sender and the receiver share a secret key, they use it only for authentication. However, a third party can make their communication confidential by simultaneously sending specially crafted messages through the same channel. (en)
  • Spreu-und-Weizen-Algorithmus oder Chaffing and Winnowing (englisch für „mit Spreu versetzen und Windsichten“) bezeichnet einen Algorithmus zur Geheimhaltung beim Versenden von Daten, ohne dass die Daten dabei verschlüsselt werden müssen. Das Verfahren wurde im Jahr 1998 von Ronald L. Rivest vorgestellt und stellt eine Alternative zu Steganographie und Kryptographie dar. Die grundsätzliche Idee ist, die unterteilte geheime Nachricht wie Nadeln in einem Heuhaufen aus irrelevanten, aber ähnlich aussehenden Daten zu verbergen. (de)
  • Se dice que un protocolo criptográfico es un protocolo de rellenado con paja y aventado cuando utiliza la técnica añadiendo paja y aventando (traducción del inglés chaffing and winnowing). El nombre de esta técnica viene derivado de la agricultura: Cuando se recoge el cereal se obtiene un compuesto en el que está mezclado la paja (inútil) y el grano (útil). Para separar el grano de la paja se echa al aire el compuesto y el viento se lleva la paja separándola así del grano. A este proceso se le llama aventar (en inglés winnowing). ​De forma similar en 1998 Ron Rivest​ propuso una técnica para conseguir confidencialidad en un canal inseguro. Para ello propone añadir tráfico de relleno (paja) a la comunicación útil (grano) y establecer un mecanismo de autenticación que permita al receptor del mensaje identificar la comunicación útil (el grano) ('aventar'). Por tanto el receptor como el emisor se tienen que poner de acuerdo en el mecanismo de autenticación a utilizar. (es)
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