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The "normal", unmodified RSA (called textbook RSA) is susceptible to some attacks. We need to change it slightly to avoid this problems. The question Definition of Textbook RSA and the Wikipedia lists some possible attacks. In practice a special padding algorithm is used, like the Optimal asymmetric encryption padding (OAEP). The documentation of the ...


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the following command do what I want : openssl smime -in msg -pk7out -out msg.pk7 openssl asn1parse -in msg.pk7



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