This paper discusses the security of multikey settings in approximate arithmetic (like the CKKS scheme) and introduces models for circuit privacy.
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By 1811, Europe was engulfed in conflict. Napoleon’s empire was at its zenith, and the British were desperate to intercept and decipher French dispatches. The most famous cryptographic tool of the era was the Great Paris Cipher , used by French diplomats, which remained unbroken for decades. However, these systems were predominantly single-key (symmetric) ciphers. If one codebook was captured or one officer compromised, the entire communication channel was lost. This paper discusses the security of multikey settings
Multikey 1811: a short history and why it matters Napoleon’s empire was at its zenith, and the