Perspectives is a new, decentralized approach to securely identifying Internet servers. It automatically builds a database of server identities using lightweight probing by "network notaries" - servers located at multiple vantage points across the Internet. Each time you connect to a secure website Perspectives compares the site's certificate with network notary data, and warns if there is a mismatch. This way you know if a certificate should be trusted! Using Perspectives prevents "man-in-the-middle" attacks, lets you use self-signed certificates, and helps you trust that your connections really are secure.