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=== VHSM virtual environment ===
[[File:VHSM_data_encryption.png|thumb|right|400px|Fig. 2 — Data encryption in the VHSM]]
The VHSM VE contains the secure storage which is the database that stores the sensitive data in the encrypted form while other data (refer the table below) are stored unencrypted. The encryption key (master key) is generated derived from the user password using [http://en.wikipedia.org/wiki/PBKDF2 PBKDF2] and not stored in database. Utilizing PBKDF2 reduces the brute-force attack rate significantly if the database is compromised. The following table lists data that stored in the VHSM:
{|class="standard" border="1"
!Data
The GCM mode guarantees integrity and confidentiality of the user data and therefore makes it possible to authenticate the encryption key derived from the user password. The VHSM uses this feature for user authentication. Registration process is shown in the [[Media:Vshm_user_registration.png|Fig. 3]].
A user is authenticated ([[Media:Vhsm_user_auth.png|Fig. 4]]) using the login/password pair and the container ID (VEID) where authentication request is received from. When a user is registered it's bound to the set of containers where one can get authorised to access to the VHSM fromAPI. If the user attempts to access to the VHSM from a non-authorized container the request is refused.
=== Transport ===
