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- W4365601329 abstract "Cloud-based and distributed computations are of growing interest in modern control systems. However, these technologies require performing computations on not necessarily trustworthy platforms and, thus, put the confidentiality of sensitive control-related data at risk. Encrypted control has dealt with this issue by utilizing modern cryptosystems with homomorphic properties, which allow a secure evaluation at the cost of an increased computation or communication effort (among others). Recently, a cipher based on a random affine transformation gained attention in the encrypted control community. Its appeal stems from the possibility to construct security providing homomorphisms that do not suffer from the restrictions of ``conventional'' approaches. This paper provides a cryptanalysis of random affine transformations in the context of encrypted control. To this end, a deterministic and probabilistic variant of the cipher over real numbers are analyzed in a generalized setup, where we use cryptographic definitions for security and attacker models. It is shown that the deterministic cipher breaks under a known-plaintext attack, and unavoidably leaks information of the closed-loop, which opens another angle of attack. For the probabilistic variant, statistical indistinguishability of ciphertexts can be achieved, which makes successful attacks unlikely. We complete our analysis by investigating a floating point realization of the probabilistic random affine transformation cipher, which unfortunately suggests the impracticality of the scheme if a security guarantee is needed." @default.
- W4365601329 created "2023-04-15" @default.
- W4365601329 creator A5004487990 @default.
- W4365601329 creator A5051633107 @default.
- W4365601329 creator A5073429393 @default.
- W4365601329 date "2023-04-13" @default.
- W4365601329 modified "2023-09-23" @default.
- W4365601329 title "Cryptanalysis of Random Affine Transformations for Encrypted Control" @default.
- W4365601329 doi "https://doi.org/10.48550/arxiv.2304.06582" @default.
- W4365601329 hasPublicationYear "2023" @default.
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