The private key is used to encrypt the signature, and the public key is used to decrypt it. However, when dealing with digital signatures, it’s the opposite. Typically, the asymmetric key system uses a public key for encryption and a private key for decryption. They work on the public key cryptography architecture, barring one small caveat. This is crucial to prevent tampering during official papers’ transmission and prevent digital manipulation or forgery. What Are Digital Signatures?ĭigital signatures serve the purpose of authentication and verification of documents and files. Now that you understand how asymmetric encryption occurs, you can look at how the digital signature architecture is set up. This eliminates the need to exchange any secret key between sender and receiver, thereby reducing the window of exploitation. Step 3: Bob uses his private key to decrypt the message.Step 2: The encrypted message is sent to Bob.
Step 1: Alice uses Bob’s public key to encrypt the message.The process for the above image is as follows: But, of course, both the keys must belong to the receiver.Īs seen in the image above, using different keys for encryption and decryption has helped avoid key exchange, as seen in symmetric encryption.įor example, if Alice needs to send a message to Bob, both the keys, private and public, must belong to Bob. The key used for encryption is the public key, and the key used for decryption is the private key. In Asymmetric Encryption algorithms, you use two different keys, one for encryption and the other for decryption.
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