In certain special cases (e.g. a Program Derived Address), public keys may nothave a private key associated with them. You can check this by looking to see ifthe public key lies on the ed25519 curve. Only public keys that lie on the curvecan be controlled by users with wallets.
import { PublicKey } from "@solana/web3.js"; // Note that Keypair.generate() will always give a public key that is valid for users // Valid public keyconst key = new PublicKey("5oNDL3swdJJF1g9Dzji*z4ynHXgszjAEpUkxVYejchzrY");// Lies on the ed25519 curve and is suitable for usersconsole.log(PublicKey.isOnCurve(key.toBytes())); // Valid public keyconst offCurveAddress = new PublicKey( "4BJXYkfvg37zEmBbsacZjeQDpTNx91KppxFJxRqrz48e",); // Not on the ed25519 curve, therefore not suitable for usersconsole.log(PublicKey.isOnCurve(offCurveAddress.toBytes())); // Not a valid public keyconst errorPubkey = new PublicKey("testPubkey");
FAQs
In certain special cases (e.g. a Program Derived Address), public keys may not have a private key associated with them. You can check this by looking to see if the public key lies on the ed25519 curve. Only public keys that lie on the curve can be controlled by users with wallets.
How do I authenticate a public key? ›
The user generates a key pair on his own computer, and copies the public key to the server. Then, when the server asks him to prove who he is, a signature is generated using his private key. The server can verify that signature (since it has his public key) and allow him to log in.
How to verify signature with public key online? ›
The signature verification process goes as follows:
- Decrypt the signature using the signer's public key.
- Compute your own hash value of the file or message.
- Compare values obtained in Steps 1 and 2. If they match the signature is verified.
To verify that an RSA private key matches the RSA public key in a certificate you need to i) verify the consistency of the private key and ii) compare the modulus of the public key in the certificate against the modulus of the private key. If it doesn't say 'RSA key ok', it isn't OK!"
How can you authenticate your document using public key cryptography? ›
To validate the integrity of the data, the receiving software first uses the signer's public key to decrypt the hash. It then uses the same hashing algorithm that generated the original hash to generate a new one-way hash of the same data.
How do you validate a public key? ›
In certain special cases (e.g. a Program Derived Address), public keys may not have a private key associated with them. You can check this by looking to see if the public key lies on the ed25519 curve. Only public keys that lie on the curve can be controlled by users with wallets.
How do I check my public key? ›
How to view your SSH public key on Linux
- Using the ssh-agent command.
- Run the following command. ssh-agent sh -c 'ssh-add; ssh-add -L'
- After successful authentication, your SSH public key will be displayed in the terminal.
- Copy and paste it where you need it.
The key can be generated by a software program, but more often, it is provided by a trusted, designated authority and made available to everyone through a publicly accessible repository or directory. A public key is also used to encrypt a message or check the legitimacy of a digital signature.
Can a public key decrypt a public key? ›
Public key cryptography is a method of encrypting or signing data with two different keys and making one of the keys, the public key, available for anyone to use. The other key is known as the private key. Data encrypted with the public key can only be decrypted with the private key.
Can you figure out a private key from a public key? ›
The private key cannot be guessed based on the public key. Because of this, a public key can be freely shared without threat of attack. The private key, in contrast, belongs to only one person.
The server, known as the relying party, holds the public key for subsequent authentication, and uses assertion to challenge the authenticator to prove its identity is valid. There are two forms of public-private key authentication: passkeys and security keys.
How do I authenticate a document digitally? ›
Each document comes with a unique code: the code needs to be encrypted and linked to the document in a similar way to digital signatures. When someone needs to verify the document's authenticity, they can use the code by entering it into the specific field on a verification portal/website.
How does PKI work for dummies? ›
PKI enables strong authentication by using digital certificates and key pairs. This ensures that only authorised entities can access sensitive systems and data. When, for example, a user tries to authenticate their identity to a server, the server generates random data and sends it to the user.
How do I verify my public key fingerprint? ›
To verify your fingerprint, log in to your VPS server through a trusted method (for example, the console in your BitLaunch control panel) and run the ssh-keygen command to get a readout of your key fingerprint: ED25519: SHA256: ssh-keygen -lf /etc/ssh/ssh_host_ed25519_key. pub.
How is a signature verified with a public key? ›
With a digital signature, a private key is used to create a hash value of the contents of the file that's being signed and sent. The recipient uses the signer's public key to decrypt the signature and verify that the decrypted hash value matches the hash of the original file.
Does public key encryption provide authentication? ›
Public key cryptography is essential for secure internet communications, allowing for confidential messaging, authentication of identities, and verification of data integrity.
