This is why there are several different encryption levels depending on the confidential level, e.g., in government documents. In the present cryptography, the memory-based attack can also be a powerful tool to a sophisticated eavesdropper, where the 50% chance in eavesdropping applies to all ...
Definition 1. [2] LetℋHbe the n-qubit Hilbert space(ℂ2)⊗𝑛(C2)⊗n. A random unitary ensemble{𝑝𝑖,𝑈𝑖}{pi,Ui}with𝑈𝑖∈𝑈(2𝑛)Ui∈U(2n)is said to be an ε-approximate t-design if the following holds: (1−𝜀)∫𝑈(2𝑛)𝑈⊗𝑡𝜌𝑈†⊗...