Popular lifehacks

How does a key agreement protocol work in practice?

How does a key agreement protocol work in practice?

Protocols that are useful in practice also do not reveal to any eavesdropping party what key has been agreed upon. Many key exchange systems have one party generate the key, and simply send that key to the other party — the other party has no influence on the key.

Are there protocols where both parties influence the final derived key?

Protocols where both parties influence the final derived key are the only way to implement perfect forward secrecy .

Why is my server’s host key not match my signature?

It appears that this is a bug where the server is encrypting it’s host key incorrectly and so the client can’t decrypt it. and clearing known hosts on the clients before connecting. Last edited by smoker; 04-20-2010 at 04:38 AM.

Which is an example of a signed key?

Such signed keys, sometimes signed by a certificate authority, are one of the primary mechanisms used for secure web traffic (including HTTPS, SSL or Transport Layer Security protocols). Other specific examples are MQV, YAK and the ISAKMP component of the IPsec protocol suite for securing Internet Protocol communications.

Can you sign a file with somebody else’s private key?

You can’t sign a file with somebody else’s private key unless you somehow manage to get hold of the private key, for example by hacking their computer. So knowing that a file comes with a good signature doesn’t say anything: what’s important is to know that it has a good signature made with the expected private key.

Can a person open an email without a DKIM key?

People opening the emails do so via a public key hosted on the DNS. Any recipient can see the contents of an email using DKIM. Still, it is impossible for anyone other than the authentic user to send emails from that address (or tamper with emails en route) without the private key.

How does a digital signature for a message work?

Creating a digital signature for a message involves running the message through a hash function, creating a digest (a fixed-size representation) for the message. A mathematical operation is done on the digest using a secret value (a component of the private key) and a public value (a component of the public key).

What’s the difference between signing and encrypting a message?

Signing does not involve encrypting a digest of the message. While it is correct that a cryptographic operation is applied on a digest of the message created by a cryptographic hash algorithm and not the message itself, the act of signing is distinct from encryption.