![]() ![]() In a digital signature system, a sender can use a private key together with a message to create a signature.Īnyone with the corresponding public key can verify whether the signature matches the message, but a forger who does not know the private key cannot find any message/signature pair that will pass verification with the public key. Public-key encryption on its own also does not tell the recipient anything about who sent a message-it just conceals the content of a message in a ciphertext that can only be decrypted with the private key. However, public-key encryption does not conceal metadata like what computer a source used to send a message, when they sent it, or how long it is. Only the journalist who knows the corresponding private key can decrypt the ciphertexts to obtain the sources' messages-an eavesdropper reading email on its way to the journalist cannot decrypt the ciphertexts. įor example, a journalist can publish the public key of an encryption key pair on a web site so that sources can send secret messages to the news organization in ciphertext. In a public-key encryption system, anyone with a public key can encrypt a message, yielding a ciphertext, but only those who know the corresponding private key can decrypt the ciphertext to obtain the original message. Security of public-key cryptography depends on keeping the private key secret the public key can be openly distributed without compromising security. Key pairs are generated with cryptographic algorithms based on mathematical problems termed one-way functions. Each key pair consists of a public key and a corresponding private key. Public-key cryptography, or asymmetric cryptography, is the field of cryptographic systems that use pairs of related keys. 2) Using Alice's public key, Bob can verify that Alice sent the message and that the message has not been modified. 1) Alice signs a message with her private key. ![]() ![]() In this example the message is digitally signed with Alice's private key, but the message itself is not encrypted. ![]()
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