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comment Are any of the major asymmetric ciphers distinguishable (EG, RSA, ECC)?
For a fixed plaintext and key pair, we can consider three sets: (1) invalid ciphertexts: numbers/bitstrings that are of the wrong form, (2) plausible ciphertexts: numbers of the right form but do not necessarily decrypt to the plaintext, (3) actual ciphertext(s): the set of ciphertexts that actually decrypt to the plaintext with the key. What I am addressing in my answer is your ability to tell (2) and (3) apart and what I omitted, which may clarify, is telling them apart without the secret key using today's level of computational ability. They can be distinguished with unlimited computation.
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answered Are any of the major asymmetric ciphers distinguishable (EG, RSA, ECC)?
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