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Optimal Asymmetric Encryption Padding is a padding scheme for RSA, codifying how short plaintext is enciphered and deciphered. It has a security reduction to the RSA problem.

3 votes

is RSA KTS-OAEP necessary?

Using small public exponents would be off the table for one. Assume a $256$-bit symmetrical key $k$ with $e = 3$ as public exponent. If we naively convert $k$ to an integer, then $k^3$ would be an $\a …
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