Security of Quantum Cryptography against Collective Attacks
نویسندگان
چکیده
We present strong attacks against quantum key distribution schemes which use quantum memories and quantum gates to attack directly the final key. We analyze a specific attack of this type, for which we find the density matrices available to the eavesdropper and the optimal information which can be extracted from them. We prove security against this attack and discuss security against any attack allowed by the rules of quantum mechanics. [S0031-9007(97)02537-4]
منابع مشابه
Bounds on Information and the Security of Quantum Cryptography
We present new physical bounds on quantum information, and use them to prove the security of quantum cryptography against a large class of collective attacks. Such attacks are directed against the final key, and security against them suggests that quantum cryptography is ultimately secure.
متن کاملComposable Security Against Collective Attacks of a Modified BB84 QKD Protocol with Information only in One Basis
Quantum Cryptography uses the counter-intuitive properties of Quantum Mechanics for performing cryptographic tasks in a secure and reliable way. The Quantum Key Distribution (QKD) protocol BB84 has been proven secure against several important types of attacks: collective attacks and joint attacks. Here we analyze the security of a modified BB84 protocol, for which information is sent only in th...
متن کاملOn the Security of Quantum Cryptography Against Collective Attacks
We present strong attacks against quantum key distribution schemes which use quantum memories and quantum gates to attack directly the final key. We analyze a specific attack of this type, for which we find the density matrices available to the eavesdropper and the optimal information which can be extracted from them. We prove security against this attack and discuss security against any attack...
متن کاملDevice-independent security of quantum cryptography against collective attacks.
We present the optimal collective attack on a quantum key distribution protocol in the "device-independent" security scenario, where no assumptions are made about the way the quantum key distribution devices work or on what quantum system they operate. Our main result is a tight bound on the Holevo information between one of the authorized parties and the eavesdropper, as a function of the amou...
متن کاملCharacterization of collective Gaussian attacks and security of coherent-state quantum cryptography.
We provide a simple description of the most general collective Gaussian attack in continuous-variable quantum cryptography. In the scenario of such general attacks, we analyze the asymptotic secret-key rates which are achievable with coherent states, joint measurements of the quadratures and one-way classical communication.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997