Office 2008 Planning

Digital certificate requirements for sending and receiving messages

The Entourage cryptography model uses public key encryption to send and receive digitally signed and encrypted e-mail messages. Encryption makes a message unreadable to anyone other than the intended recipient. To send an encrypted message, the sender must have a copy of the recipient’s digital certificate. The message is encrypted specifically for each recipient by using the recipient’s public key; it can be decrypted only by using the associated private key, which is stored on the recipient's computer. Entourage uses the sender’s keys to read and write encrypted messages in the Drafts or Sent Items folders, which allows users to review encrypted messages that they have created. If the sender has no digital certificate, this review is not possible.

A digital signature helps the recipient verify the sender’s identity and the message integrity. Digitally signing a message helps the recipient verify that you are the authentic sender and that the contents of the message were not altered in transit.

Tip We recommend that digital certificates have a key size of 1,024 bits or more. Using a digital certificate of this size makes it extremely difficult to decode an encrypted message or forge a digital signature. For more information about the digital certificate key size, see Entourage Help.

To

The digital certificate requirement is

Send an encrypted

The sender must have a copy of each recipient’s digital certificate. The

message

sender does not need to have a digital certificate of his or her own. However,

 

if the sender does not have a digital certificate, he or she will not be able to

 

read the saved message in the Draft or Sent Items folder, and will not be

 

able to receive an encrypted response from a recipient.

Receive an

The recipient must have a digital certificate of his or her own. The sender

encrypted

must have a copy of the recipient's digital certificate in order to encrypt the

message

message.

 

Entourage 2008 can encrypt messages with any of the following encryption

 

algorithms: AES-256, AES-192, AES-128, and 3DES. Of these four algorithms,

 

3DES is the most compatible with other S/MIME applications and AES-256 is

 

the most secure.

 

Entourage 2008 supports the following signing algorithms for digital

 

signatures, which are listed from strongest to weakest: SHA-512, SHA-384,

 

SHA-256, and SHA-1. Of these four algorithms, SHA-1 is the most

 

compatible with other S/MIME application, and SHA-512 is the most secure.

 

 

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Microsoft GZA-00006 manual Digital certificate requirement is

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