Description: RSA can also be used as a signed message. If i want to give B send a signed message, then she can for her calculation of a message hash value, and then use her key encryption of the hash value and the " signed" the message added to the back. This message is only used her public key can be decrypted. B received the news with a public key can decrypt the hash value, then this data with his own message for the hash value calculated in comparison. If the two match, then the sender to know him a key holder, as well as in the dissemination of this message on the path had not been tampered with.
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