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Let's say i have one plaintext and i encrypt it with different keys (each on its own). Is it possible to find the plaintext from these encrypted ciphers or how hard is it to resample the text? Does this even make sense, especially in respect to asymmetric-encryption?

For example:

    VALUE     KEY         CIPHER
    "abc"  +  "key1"  ->  "izwer"
    "abc"  +  "key2"  ->  "werio" 
    "abc"  +  "key3"  ->  "nbmdi"
    "abc"  +  "key4"  ->  "oiuuw"
Cœur
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cesar09
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  • You may want to research known plain text attacks. From my limited understanding, it's slightly different but may still be useful. And as every analysis, the result depends heavily on the cryptosystem in question -- but I assume you know that and have a specific case in mind that you just didn't specify here. –  Nov 19 '12 at 20:44

1 Answers1

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The best known example of an attack against asymmetric encryption with multiple keys is Hastad's broadcast attack against RSA. This is of course one of the motivations to use a properly designed padding scheme.

Jack
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