Patent ID: 9363034
Filing Date: 2016-06-07
CPC Classification: H04K,H04L,H04W

Claim Text:
1. A method to encrypt information that is transferred between two communication units, a security module being present in each communication unit, the method comprising: introducing a Secure Digital (SD) card in a card-holder location in a first one of the communication units, a security application containing encryption and decryption algorithms being stored on the SD card; transferring the security application from the SD card to the security module of the first communication unit except for a session key stored on the SD card; forming a session key derived stream in the SD card based on the session key, the session key derived stream being a stream of information derived from the session key; transferring the session key derived stream from the SD card to the security module of the first communication unit; encrypting a data stream, in the security module of the first communication unit, including a plurality of sub pieces of information transmitted one after the other over time using the session key derived stream to obtain an encrypted stream of data; transmitting the encrypted stream of data by the first communication unit after the encryption; and wherein the encrypted stream of data is received by a second one of the communication units, decryption occurring with the aid of a corresponding key stream in the security module of the second communication unit, the corresponding key stream being formed in an SD card of the second communication unit based on the session key.