Google Message Encryption Administration Guide Manuale Utente Scaricare il pdf (Pagina 9)

10 Postini Encryption Services Administration Guide

The protocol uses cryptography to provide endpoint authentication and

communications privacy over the Internet. TLS is the email equivalent of HTTPS

for web communications and has similar strengths and weaknesses.

The key features of TLS are:

• Message encryption

TLS uses Public Key Infrastructure (PKI) to encrypt messages from mail

server to mail server. This encryption makes it more difficult for hackers to

intercept and read messages.

• Authentication

TLS supports the use of digital certificates to authenticate the receiving

servers. Any certificate is supported, included self-signed certificates.

Authentication of sending servers is not always necessary in TLS. This

process verifies that the receivers (or senders) are who they say they are,

which helps to prevent spoofing. Advanced options include the ability to verify

proper certificate form, domain names, and certificate authority.

Organizations that have a dedicated outbound gateway that handles only TLS

traffic can utilize the Mandatory TLS option. This feature, when activated, will

monitor the TLS handshake inbound and outbound and only allow message

transmission when the TLS handshake is successful. Notification to the sender

occurs in real time if the message can not be delivered.

For a full description of how TLS works, including key exchange information, see

Transport Layer Security for Inbound Mail in the Email Security Service

Administration Guide.

Policy Enforced TLS

Policy Enforced TLS enables organizations to identify the domain names of

gateways that require inbound and outbound message traffic to travel via a TLS

connection.

Policy Enforced TLS is enabled and configured in the Administration Console,

under TLS settings. If you have Policy Enforced TLS, you can add specific

domains for special treatment.

Key features of Policy Enforced TLS are:

• Compatibility with standard TLS settings

• Ability to handle important domains separately

• Ability to guarantee encrypted traffic and to bounce messages if encryption is

not possible.

Policy Enforced TLS is set for an email config organization.

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