![]() This can prevent a third-party from "spoofing" the identity of someone. The receiver ( uses the public key of the sender to verify that the signature is actually being sent by the indicated user. The sender of a message ( can "sign" the message with his private key. $ gpg -keyserver -search-keys searching for from hkp server So to write to will use reader's public key and vice versa. It means that must import the public key of reader and vice versa. In our scenario, there are two persons who want to communicate and they put their public keys on keyserver: So each party has their own private key and the other user's public key. Establishing a secure communication means that you have already exchanged public keys with people or organization you trust in. Any private key has one public key and any public key has one private key it is always one to one mapping. The security is assured by private and public keys. Of course, this requires you to trust the public key. This does not make a message unreadable to anyone but can verify that the message really originated from the sender and was not altered since. ![]() The fingerprint can be verified against a public key. When you sign a message, then it creates a fingerprint for the message just to make sure that the content hasn't been altered, but it has no effect on the message itself and the message will never be encrypted. Message encryption makes the whole message unreadable to anyone but the owner of the corresponding private key. The principles of encrypting and signing messages ![]() It ensures data integrity, message authentication, and non-repudiation altogether. Encryption provides confidentiality although signing binds the identity of the message source to this message. Encryption will be a welcome safeguard for whenever you, your family, or business partners need to communicate sensitive information from one side of the globe to the other. Because our equipment is regularly connected to the internet and there is some communication, we need to protect the critical information we exchange. There is no absolute security on the internet or through a network.
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