I got this article form a Indian mobile provider
BlackBerry Enterprise Server
BlackBerry Enterprise Server acts as the link between wireless devices, wireless networks and enterprise applications. The server integrates with enterprise messaging and collaboration systems, to provide mobile users with access to email, enterprise instant messaging and personal information management tools. All data between applications and BlackBerry devices flows centrally through the server.
The BlackBerry Enterprise Solution™ takes care of the corporate data security. It features an end-to-end security model that is designed to protect corporate information from attack, as users send and receive email and access data wirelessly.
It safeguards the integrity, confidentiality and authenticity of corporate data with a strong encryption scheme that keeps data encrypted while it is in transit between the BlackBerry Enterprise Server and BlackBerry devices.
The BlackBerry Enterprise Solution offers two transport encryption options, the Advanced Encryption Standard (AES) and Triple Data Encryption Standard (Triple DES)* encryption, for all data transmitted between the BlackBerry Enterprise Server and the BlackBerry® device.
Private encryption keys are generated in a secure, two-way authenticated environment and are assigned to each BlackBerry device user.
Data sent to the BlackBerry device is encrypted by the BlackBerry Enterprise Server using the private key, retrieved from the user's mailbox. The encrypted information travels securely across the network to the device, where it is decrypted with the key stored there.
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