Developer's Guide to Web Application Security

The hashed information is then encrypted with the sender’s private encryption

key.The recipient uses the sender’s public key to decrypt the hash code and com-

pares it to the hash code for the digital signature to see if it matches. If it does, the

message is verified as being securely transmitted.

PGP integrates nicely with most widely used e-mail applications such as

Microsoft Outlook/Outlook Express, Lotus Notes,Thunderbird, Eudora, and Apple

Mail to provide added security to these infrastructures. It also will encrypt messages

exchanged between instant messaging (IM) clients like AOL Instant Messenger

(AIM), Apple iChat, and Trillian. Rather than ...