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When users want to send a secure message to another user, they use the recipient's public key to encrypt the message.
All your friends and associates, once known to you, will have their emails encrypted using your public key .
Now anyone can use your public key to encrypt email messages to you, but only you alone can use your private key for decryption.
A private key is used to decrypt data encrypted with the corresponding public key and to create digital signatures.
public key cryptography
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