METHOD AND SYSTEM IN A DIGITAL WIRELESS DATA COMMUNICATION NETWORK FOR ARRANGING DATA ENCRYPTION AND CORRESPONDING SERVER

摘要

The invention concerns a method and system in a digital wireless data communication network (10, 11) for arranging data encryption as one-time pad encryption. The data communication network (10, 11) includes at least two terminal equipment (A, B), which are used to manage a set of indexed encryption keys (S_N) and of these the first terminal equipment (A) is at least a transmitter and the second terminal equipment (B) is at least a receiver. Data encryption is adapted to take place at the first terminal equipment (A) in stages, wherein, an encryption key index (N) is chosen (302-306, 702), the data (M) to be transmitted is encrypted by using the chosen encryption key defined by the encryption key index (N) (308, 704), and the encrypted data (RM) is transmitted to the second terminal equipment (B) (309, 705) and wherein, correspondingly, at the second terminal equipment (B), the encrypted data (RM) is received (401, 706), and the encrypted data (RM) is decrypted by using the chosen key (S_N) indicated by the encryption key index (N) (404, 709). Besides the encrypted data (RM), the said encryption key index (N) is transmitted to the receiving terminal equipment (B). The data communication network (10, 11) also includes a special server terminal equipment (13.1), which is arranged to manage and distribute a set of indexed encryption keys (S_N) to the terminal equipment (A, B). The invention also concerns a corresponding server terminal equipment (13.1).