Alternatively, users can exchange passwords or keys with their friends to form a decentralized network.

They exchange keys so Paul can go to Tom's place to fetch the cash register keys.

At the start of their message, they exchange public keys, unencrypted over an insecure line.

For emergencies, the sis-ters had exchanged keys when Stacy bought the house.

Instead they are often used to exchange symmetric keys, which are relatively short.

We'd exchanged keys and had dinner at Yamashiro, a restaurant some 250 feet above Hollywood Boulevard.

With difficulty he managed to exchange keys.

In some instances this may require exchanging identical keys (in the case of a symmetric key system).

Once the master key has been securely exchanged, it can then be used to securely exchange subsequent keys with ease.

For sending emails, every recipient must support the encryption method, and must exchange keys correctly.