Summary of Contents for Ardy Electronics sec-line GSM-2002/MW3026
- Page 1 User Instruction Instructions about the The Sec-Line GSM-2002/MW3026. Ardy Electronics Ltd P.O.Box 47 S-70140 Orebro Sweden Phone: +46 19 247010 Fax: +46 19 247011 e-mail: info@ardy.se www.ardyelectronics.com Page 1 of 12...
- Page 2 The Sec-Line GSM-2002/MW3026 The Sec-Line Phone 2002/MW3026 is a dual band GSM 900/1800, composed of a GSM phone equipped with an encryption function. Plain communications are established, through the voice channel, either with or without the function. This means that the function does not interfere with plain communications.
- Page 3 Description of the encryption function: Encryption function. (Figure 1) The encryption function is inbuilt in the GSM phone, the encryption function as figure 1 is composed of: • The Vocoder, which digitises the voice. • The encryption component with a 128-bit encryption key and a proprietary algorithm.
- Page 4 Sec-Line Base Phone 2002/C500 Sec-Line Base Phone 2002/C500 is placed under the connected telephone, the solution is based on the encryption equipment called 2002/C500. The 2002/C500 unit is installed between the handset and the telephone. The choice of this type of connection has been designed with the concern to propose equipment independent of the telecom network.
- Page 5 • The traffic key management allows defining a hierarchical structure of the cryptographic network. • Allows establishing encrypted communication with the 2002/MW3026 GSM phones type. • New vocoding technology enhances the voice quality. • Easy to use and operating procedures are user friendly. •...
- Page 6 Key Management Prior any encryption call the voice signal is digitised then encrypted. The encryption algorithm is using 128-bit encryption traffic key. Keys are loaded into the encryption component locally by the means of the “Key management System” Keys are also loaded by using a personal desktop computer with the appropriate software called “User Station”.
- Page 7 The encryption function for the GSM phone 2002/MW3026, as well as the 2002/C500 base unit (both called encryption devices) store traffic keys, allowing encrypted communication. Each encryption device belongs to a given user. Each user belongs to one or several groups of users.
- Page 8 Algorithm. The proposed algorithm is a pseudo random generator based on set of non.-linear functions associated linear shift registers with maximum period feedback. The traffic key length is 128 bits and allows 10 values of key that avoids possibility of systematic tries. In addition a 64 bits message key is exchanged at each time communication, this key modifies the binary sequence issued from the same key.
- Page 9 The 2002/MW3026 and 2002/C500 plain override facility. The 2002/MW3026 GSM mobile unit as any kind of GSM mobile phone allows communicating in plain mode with every other GSM phone with or without the encryption function connected. The 2002/C500 base unit is transparent during a plain communication.
- Page 10 When receiving a call the 2002/MW3026 GSM phone will be set automatically in PLAIN mode for a plain call, on ENCRYPTION mode for a encrypted call. If the encryption function is not connected to secure the GSM phone during an encrypted call the following message will be displayed: “Crypto Call”...
- Page 11 Good Intelligibility and Good recognition at encryption Mode. The encryption function is equipped with a very high quality level vocoder. It is working at 5600 bd (baud) with only 4800 bd are used for the digitalisation of the voice. The remaining 800 bd are used to correct error of the transmission.
- Page 12 Operator dependent services: • Call forwarding • Call restriction • Short message, send, receive, multi send, • Conference call • Call waiting • Call Hold • Call ID • Prepaid calls • Advise of charge • Fixed dialling • Phase II approved •...
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