Abstract: A cryptographic device for enabling encryption and decryption of data to be transferred between communication devices is provided. The cryptographic device comprises a first interface for connecting the cryptographic device to a communication device, wherein the first interface is adapted to transfer and receive data between the cryptographic device and the communication device; a safe memory storing one or more symmetric private keys for encrypting and decrypting data; an output module for outputting decrypted data; an input module for inputting unencrypted data; a microprocessor and a connection manager.