When two entities are communicating with each other, and they do not want a third party to listen to their communication, then they want to pass on their message in such a way that no body else could understand their message. This is known as communicating in a secure manner or secure communication. Secure communication includes means by which people can share information with varying degrees of certainty that third parties cannot know what was said.

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  • When two entities are communicating with each other, and they do not want a third party to listen to their communication, then they want to pass on their message in such a way that no body else could understand their message. This is known as communicating in a secure manner or secure communication. Secure communication includes means by which people can share information with varying degrees of certainty that third parties cannot know what was said. Other than communication spoken face to face out of possibility of listening, it is probably safe to say that no communication is guaranteed secure in this sense, although practical limitations such as legislation, resources, technical issues (interception and encryption), and the sheer volume of communication are limiting factors to surveillance. The purpose of this article is to describe the various means by which security is sought and compromised, the differing kinds of security possible, and the current means and their degree of security readily available. With many communications taking place over long distance and mediated by technology, and increasing awareness of the importance of interception issues, technology and its compromise are at the heart of this debate. For this reason, this article focusses on communications mediated or intercepted by technology. Also see Trusted Computing, an approach under present development that achieves security in general at the potential cost of compelling obligatory trust in corporate and governmental bodies.
  • 2つの主体が互いと通信する時に、その主体が第三者にその通信が聞くことを望まなければ、その主体は他の誰もその通信内容が理解できない手段によって内容を渡すことを望むが、これは安全な手段による通信、あるいはセキュア通信（セキュアつうしん）として知られる。セキュア通信として求められる性質は機密性(confidentiality)、認証、メッセージ完全性と否認不可能性、可用性とアクセス制御である。長い期間、セキュア通信の主要要素は機密性、認証、メッセージ完全性および否認不可能性と考えられてきた。セキュア通信の概念に可用性とアクセス制御が導入されたのは最近である。 日常的な電話や電子メールなどでの通信では盗聴の可能性を意識することがなくても、金融・商業(デジタル著作権)・外交・軍事などの分野での通信においては盗聴や改竄への対策が必要であろう。盗聴の可能性は、法律・資源・技術的な問題（傍受と暗号化）やコミュニケーション量などの現実的な制限により、限定的であるとしても、安全性は保証されていないことには変りは無い。
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  • Crypto_key.svg
  • Cryptography
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  • When two entities are communicating with each other, and they do not want a third party to listen to their communication, then they want to pass on their message in such a way that no body else could understand their message. This is known as communicating in a secure manner or secure communication. Secure communication includes means by which people can share information with varying degrees of certainty that third parties cannot know what was said.
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  • Secure communication
  • セキュア通信
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