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An asymmetric (e.g. public-key) cryptosystem, based on modular exponentiation with big exponents and modulus. RSA can be used both for signature and encryption with proper paddings.

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What is the history of recommended RSA key sizes?

Indeed, 463 bits was considered sufficient in the mid-1990s for the RSA-140 challenge. … Inferred from this RSA article and this (irritatingly uncited) Wikipedia section. 2. A sister document of the PDF cited in the question. …
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