GSMK CryptoPhone PSTN/1i User Manual
Contents
1. to you that the key setup procedure for the secure connection is in progress Key setup may take from 10 to 20 but typically 15 seconds depending on line quality Once the key setup is completed you will hear a Ping sound and can start talking to your partner Verify the authenticity of the key Please take a look at the telephone display and read the three letters after SAY to your partner and check the three letters after CHK Reading the three letters to your partner and verifying what your partner says is meant to protect you against so called man in the middle attacks on the secret session key The letters are mathematically derived from the unique secret key that is used for each call By reading and verifying them with your partner you make sure that you are indeed communicating using the same key Please pay attention to the voice of your partner when he reads his three letters To be completely on the safe side against very sophisticated voice impersonation during key verification you could periodically re verify the letter code with your partner during the conversation Hang up the telephone receiver when you wish to finish the call 2 2 If your CryptoPhone PSTWN 1 is in clear mode key in horizontal position 2 2 1 2 2 2 2 2 3 2 2 4 Lift up the telephone receiver Note that when you lift up the telephone receiver in clear mode while the calling party has activated the secure mod2. Q CRYPTOPHONE GSMK CryptoPhone PSTN 1i User Manual B Installation Turn the key operated switch on the left side of the device to its vertical position labeled SECURE using one of the supplied keys Connect the telephone that comes with your CryptoPhone PSTN 1 to the encryption unit jack on the back of the PSTN 1 encryption unit labeled Phone Connect the telephone power supply to a power outlet Connect the phone line to the PSTN 1 encryption unit jack on the back of the PSTN 1 encryption unit labeled Line Connect the encryption unit s power supply to the PSTN 1 encryption unit on one side and to a power outlet on the other side Verify that the large Power button on the front of the PSTN 1 encryption unit until is lit blue If it is not check that you properly connected the power cord If the CryptoPhone PSTN 1 was previously switched off intentionally you can switch it on again by briefly pressing the Power button see also Section H of this manual Wait two to three minutes for the system to initialize The phone will ring once briefly when the initialization process is finished You cannot use the CryptoPhone PSTN 1 before the initialization process is finished Basic operation secure and clear mode The CryptoPhone PSTN 1i supports clear as well as encrypted calls The device features a key operated switch on the left side of the device Each device comes with two matching keys which should be k
3. e on the other side you will hear nothing because the other side is waiting for your device to identify itself and start the key setup procedure Switch the device from clear mode to secure mode by turning the key from the horizontal position to the vertical position You will then hear the ditt dutt ditt dutt sound that signals to you that the key setup procedure for the secure connection is in progress Key setup may take from 10 to 20 but typically 15 seconds depending on line quality Once the key setup is completed you will hear a Ping sound and can start talking to your partner Verify the authenticity of the key Please take a look at the telephone display and read the three letters after SAY to your partner and check the three letters after CHK as detailed above in section 2 1 2 to protect yourself against man in the middle attacks Hang up the telephone receiver when you wish to finish the call PSTN 1i QSG V0 1E Page 4 E Switching from clear mode to secure mode while in a call The CryptoPhone PSTN 1i allows you to switch from clear mode to secure mode while in a call This comes in handy when you determine that you need to discuss sensitive or classified information while you are in the middle of a clear unencrypted conversation To switch from clear mode to secure mode while in a call agree with your partner verbally to switch to secure mode Then do the following 1 Turn the key fro
4. ed and could be monitored and intercepted 2 3 Hang up the telephone receiver when you wish to finish the call The CryptoPhone PSTN 1i was designed for use with the analog fixed line network In contrast to the digital ISDN network the analog network cannot signal whether an incoming call is digital data or voice As a consequence an incoming encrypted call which is transported as encrypted data cannot be recognized as such When you pick up the telephone receiver while in secure mode to answer an incoming call your device will always try to establish a data connection with the other side If the other side is in clear mode or not capable of making encrypted calls at all the other side will hear a high pitch modem tone but will not be able to talk to you For this reason if your device shall accept incoming clear calls the recommended procedure is to leave the device in clear mode when not in a call To receive secure calls when your device is in clear mode see section D 2 2 and section E PSTN 1i QSG V0 1E Page 2 D Placing and receiving secure calls 1 TO PLACE A SECURE CALL 1 1 Put the device in secure mode The key must be in the vertical position 1 2 Lift up the telephone receiver You will hear a dial tone produced by the device 1 3 Dial the desired number You will first hear the ringing tone Once the called party has accepted the call the ringing tone will be followed by a ditt dutt ditt dutt sound t
5. ept in a safe place The key operated switch can be turned in one of two positions Figure 1 SECURE SECURE MODE When the key switch is in a vertical position the CryptoPhone PSTN 1 is in secure mode Outgoing calls are encrypted and C LEAR only incoming encrypted calls are accepted Figure 1 Mode control CLEAR MODE When the key switch is in a horizontal position the CryptoPhone PSTN 1 is in clear mode Outgoing and incoming calls are not encrypted PSTN 1i QSG V0 1E Page 1 C Placing and receiving clear unencrypted calls 1 TO PLACE A CLEAR CALL 1 1 Put the device in clear mode The key must be in the horizontal position 1 2 Lift up the telephone receiver You will hear the usual dial tone 1 3 Dial the desired number just like you would on an ordinary phone 1 4 After the call has been established conduct your conversation The clear text conversation will not be encrypted and could be monitored and intercepted 1 5 Hang up the telephone receiver when you wish to finish the call 2 TO RECEIVE A CLEAR CALL 2 1 If you expect incoming clear calls put the device in clear mode The key must be in the horizontal position You cannot receive incoming clear calls while the unit is in secure mode 2 2 When the phone rings lift up the telephone receiver You will hear the calling party s voice just like you would using a normal telephone The clear text conversation will not be encrypt
6. hat signals to you that the key setup procedure for the secure connection is in progress Key setup may take from 10 to 20 but typically 15 seconds depending on line quality Once the key setup is completed you will hear a Ping sound and can start talking to your partner 1 4 Verify the authenticity of the key Please take a look at the telephone display and read the three letters after SAY to your partner and check the three letters after CHK Reading the three letters to your partner and verifying what your partner says is meant to protect you against so called man in the middle attacks on the secret session key The letters are mathematically derived from the unique secret key that is used for each call By reading and verifying them with your partner you make sure that you are indeed communicating using the same key Please pay attention to the voice of your partner when he reads his three letters To be completely on the safe side against very sophisticated voice impersonation during key verification you could periodically re verify the letter code with your partner during the conversation 1 5 Hang up the telephone receiver when you wish to finish the call PSTN 1i QSG V0 1E Page 3 2 TO RECEIVE A SECURE CALL 2 1 If your CryptoPhone PSTWN 1 is in secure mode key in vertical position 2 1 1 2 1 3 Lift up the telephone receiver You will hear the ditt dutt ditt dutt sound that signals
7. m horizontal to vertical position to switch to secure mode Both sides need to switch to secure mode simultaneously by turning their respective keys in order to allow the two devices to synchronize and start the key setup procedure If the two sides do not switch to secure mode simultaneously within ca two seconds the connection will be terminated After you and your conversation partner have switched to secure mode you will hear the ditt dutt ditt dutt sound that signals to you that the key setup procedure for the secure connection is in progress just like you would when making a secure call from the start Once the key setup is completed you will hear the familiar Ping sound and can start talking to your partner 2 Verify the authenticity of the key Please take a look at the telephone display and read the three letters after SAY to your partner and check the three letters after CHK to protect yourself agains the so called man in the middle attack 3 Hang up the telephone receiver when you wish to finish the call Note that for security reasons it is not possible to switch from secure mode back to clear mode while in a call To switch back to clear mode when in a secure call you must first finish the secure call F Calling from the CryptoPhone PSTN 1 to mobile GSM CryptoPhones GSMK CryptoPhones offer full interoperability between fixed line and mobile devices The procedures for placing clear a
8. nd secure calls from the CryptoPhone PSTN 1 to mobile GSM CryptoPhones are the same as outlined above however the following conditions must be met In order to place a secure call from a CryptoPhone PSTN 1 to a mobile GSM CryptoPhone e g a GSMK CryptoPhone G10 G10i a CryptoPhone model 100 200 220 or 300 you must obtain a separate data number for incoming V 32 data calls from your mobile network operator This number is also known as a Data Terminating Number Please contact a customer service representative of your mobile network operator of choice to learn how to order an incoming data number for your specific GSM service contract Once you have received such a separate data number from your mobile network operator only use this number instead of the regular voice number to initiate a secure call Note that during a fixed line to mobile connection from the CryptoPhone PSTN 1 to a mobile GSM CryptoPhone it is not possible to switch from clear mode to secure mode or vice versa while in a call This is due to the way the GSM network handles incoming voice and data calls PSTN 1i QSG V0 1E Page 5 G Calling from mobile GSM CryptoPhones to the CryptoPhone PSTN 1 In order to place a secure call from a mobile GSM CryptoPhone to a CryptoPhone PSTN 1 you must switch the CSD Line Type on your mobile GSM CryptoPhone from V 110 non transparent to V 32 non transparent if it is not already set to V 32 For instance e As a Crypt
9. oPhone G10i user within the CryptoPhone application press Menu gt Settings and in the menu that will appear select Call to Analog V 32 instead of GSM ISDN v 110 V 32 may or may not be your default CSD Line Type depending on your local network environment e As a CryptoPhone 200 220 or CryptoPhone 300 user go to Start gt Settings gt Connections gt CSD Line Type to do the same Please always refer to the manual that came with your mobile GSM CryptoPhone for details On most GSM networks GSM to GSM secure calls can be made in either V 110 or V 32 mode however call setup in V 32 mode will take significantly longer due to the way the call setup is handled in this mode Note that during a mobile to fixed line connection from the CryptoPhone PSTN 1 to a mobile GSM CryptoPhone it is not possible to switch from clear mode to secure mode or vice versa while in a call This is due to the way the GSM network handles outgoing voice and data calls H Switching the CryptoPhone PSTN 1 off The CryptoPhone PSTN 1 needs to be turned on all the time in order to be able to accept incoming calls It is designed to run for months and years without interruption In case that you need to e g transport the unit to a different place please press the Power button on the front of the PSTN 1 encryption unit for five seconds The blue light will turn off You can then disconnect all power and telephone lines attached to the unit in reve
10. rse order as when you did when turning the unit on Telephone Features To use the advanced features of the telephone that came with your CryptoPhone PSTN 1 system please refer to the separate telephone operating instructions that also came with your CryptoPhone PSTN 1 system PSTN 1i QSG V0 1E Page 6
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