Patent ID: 7251825
Filing Date: 2007-07-31
Classification: H04L

Abstract:
1. A method to use a virtual private network (VPN) having a plurality of units connected to a public network, each unit having a security device which includes at least a unique number UA, said virtual private network including a first unit generating a right Dn associated to the unique number UAn and at least one second unit Um, the security device of the at least one second unit receiving the right Dn from said first unit, the method comprising: encrypting the data sent by unit Un and a description of the right Dn necessary for the decryption of the data, by an encryption data key KS, creating a control data block that includes the encryption data key KS and the description of the right necessary for the decryption of the data, receiving the encrypted data and the description of the right Dn by the at least one second unit Um, and receiving the control data block by the at least one second unit Um, and presenting the encrypted control data block to the security device of the at least one second unit Um to verify if the right Dn is present in the security module of the at least one second unit, wherein if the right Dn is present, then using the encryption data key KS to decrypt the encrypted data.