digiCRYPT user manuals v.2.1, english ()
Contents
1. Www digitech si digiCRYPT mobile communication encryption software User s manual v 2 1 en j i ee Fi f Digicrypt 2 Dec 25 2012 1 44 28 PM Digicrypt 2 c 25 2012 1 UMTS n 9 A Digitech d o o Podlimbarskega ulica 29 1000 Ljubljana Slovenia EUROPE www digicrypt info info digicrypt info Page 1 9 www digicrypt info Digitech d o o 2012 All rights reserved DigiCRYPT user manuals v 2 1 CONTENTS GISICRY PT eg et ea 0 30 00 g EEE EE EEE 3 VPN 3 Using the XMPP SETver serernnrenennnsnnnnnnennnnnsnnennnsnnnnnnennnnnsnnennnsnnennnennnnnnenennneenennnennennsenenunsenenunennnnnnenennnsenennnsenenasenennnsenene 3 VETT NNN 4 TEN 5 Calling Contacts list Adress book sicessmscicnidanxtinesnsgasamdinpatineneascaavainndentatsainndaianthunduaanbaiddusdluahetadauedineadantanscaraatamtiandananiewiian 5 the WakeUp SMS rnp E E E EE 6 SE oeno A AA 6 Sending an encrypted SMS message rrrannrnnnnnrnnrnnnrnnnnnernnnnnrrnrnnnrnnnnnenennnnsnnrnnennnnnnennnnnnsnnrnnenennunenennunsnnnnnesnnnnnesnnnunenennnneee 7 EE ET EE E E EE EN E 8 Po on AG ESA E EE EE EE TE EN 8 Eo fell A ne ee EEE NE EE NE EE EN EE PN EN 8 Useful Information about digiCRYPT svansaaservsasseesas osean T 9 Information about GSM bugging possibilities arrrrrvvvvrvrrrrnnnnnnnnrrrrrssnnnnnnnnrrrnnnnnnnnnnnenensssnnnnnnnsrrnnnnnnnnnneessnssnsnnnnnssvsvnnnnnn 9 info digicrypt info Page 2 9 www di2. has white icons are online and we can call them by clic king on the username In a Log button direction means call direction in the phone incoming out of the phone outgoing The green color means successful connection and red color means no connection for example nobody answered the call lf we hold the contact for a while a menu for additional options opens Send SMS Edit File transfer CALLING CONTACTS LIST ADRESS BOOK P When we click on the online user a window with the call button Digicrypt 2 appears With a click on the Call button a calling started Edit Delete If we hold the user for a while instead of clicking on it advanced Send encrypted user menu opens where we can select Edit Delete Send Se Digicrypt 2 encrypted SMS or Send encrypted file Those functions will be described further in the manuals info digicrypt info Page 5 9 www digicrypt info Digitech d o o 2012 All rights reserved DigiCRYPT user manuals v 2 1 THE WAKE UP SMS The Wake up SMS can be used in a case that the user with which we want to communicate is offline not connected to the server With Wake up SMS we send him a SMS message where we ask him to start the digiCRYPT application pre defined SMS content Please launch digiCrypt A phone number of the called user must be defined in order to make Wake up functio
3. we haven t established a communication with the other party yet the error message will be displayed info digicrypt info Page 7 9 www digicrypt info Digitech d o o 2012 All rights reserved DigiCRYPT user manuals v 2 1 og FILE TRANSFER digiCRYPT enables also encrypted file transfer which can also be done through the Contacts list Holding down the contact and selecting Send encrypted file brings up the file select window where we can select a file to transfer and confirm sending When a receiver gets a incoming file notification this notification must be confirmed and the file transfer begins Before the first file exchange we must do at least one call to the other per son so the certificate exchange is preformed Transferring file Digicrypt 2 20121216 115334 jpg In case that we haven t established a communication with the other party yet the error message will be displayed og ADDING THE NEW USER When adding new contact at least User account name must be entered Other two parameters Visible user name Phone number are optional but we suggest you entering phone number as well in order to have Wake up SMS and Encrypted SMS functions enabled og LOGOUT AND LOCK Using Logout and lock button we minimize and close the digiCRYPT pro gram To bring the program on the screen again press the program icon To shut down the program completely close it
4. gicrypt info Digitech d o o 2012 All rights reserved DigiCRYPT user manuals v 2 1 og DIGICRYPT THE APPLICATION DESCRIPTION digiCRYPT is an end to end VoIP encryption software solution for mobile phones Application enables encrypted full duplex speech conversation and also text messages communication Using digiCRYPT does not require any hardware upgrades on the mobile phone itself For the encryption 4096 bit RSA public and 256 bit AES private keys are used where the AES key is changed for every session conversation For securing the voice and data information 3G UMTS GPRS EDGE or WiFi networks can be used data connection There is an application available for personal computer as well so call from GSM phone to PC is possible as well User name and password can be created on a public XMPP server or the user can create and use its own XMPP server XMPP is used only to match device IP s addresses all communication is direct device to device og DIGICRYPT INSTALLATION The apk installation file must be send to mobile phone using PC or an installation file should be copied to the phone s SD card If the file is copied to the phone you must run this file using filesystem managing pro gram for example Astro manager and the digiCRYPT application installation starts After the digiCRYPT software is installed we can run it and log in using our user name and password When we start the application for the first time it
5. ication for the next time we are prompted to enter PIN number If PIN is not entered error message appears and the application does not start When the application starts it tries to connect to the XMPP server and user name and password for XMPP are requested You should use username and username password as set on XMPP server example john smith digicrypt mobi After clicking on a Login button the program connects to XMPP server and refreshes program s contact list info digicrypt info Page 4 9 Digitech d o o 2012 All rights reserved qwertyuiop al 91 OG DAN NG t HATE a Credentials digicrypt1 server com qwertyuiop fF eg Feira e t zxcevbnm ea aie E 3 e Lo com Next www digicrypt info DigiCRYPT user manuals v 2 1 DIGICRYPT MAIN SCREEN Digicrypt 2 After successfull login the main screen opens where we can navigate using Digicrypt 2 finger for sliding the display up and down Digicrypt 2 Digicrypt 2 The top section contains all contacts that we can communicate to Con tacts or the list of the last made calls Log You can switch between both lists using bottom buttons Contacts that are gray are currently offline application is not running or does not have a connection to XMPP and we can t talk to them directly we can use Wake up SMS function Contacts which
6. n working You can set it if pressing Edit button in the Con tacts list CALLING When we call selected contact ringing starts When a called person accepts the call securing incoming and outgoing call procedure starts which takes few seconds on display securing incoming outgoing During this time unique keys for the session encryption are created and exchanged between both sides After key exchange when both conversation directions are secured we can talk using phone as normal After the conversation is over we hang up the call with the on screen End call button Signal strength bar indicator is also displayed during the conversation which gives us estimate connection quality If this is the first time that the contacts are in conversation a key exchange must be preformed first and user is warned that this is the first time the user is Communicating with the person called If this message appears on a contact which has been called before it means that its phone might be changed application reinstall will cause certificate replacement or the user s identity might be fraud someone else is trying to communicate using this person s XMPP account Be aware in such situati ons that you check the reason for a different key info digicrypt info Page 6 9 Digitech d o o 2012 All rights reserved sh Hangup Digicrypt 2 Send a request via SMS to launch digiC
7. rypt ie Securing the call Digicrypt 2 ie incoming call Digicrypt 2 You never spoke with this contact www digicrypt info DigiCRYPT user manuals v 2 1 Call quality in a great way depends on a mobile or WLAN network quality If network speed is unsufficient a gaps in the conversation may occur or call is even terminated Please make sure that a network signal is sufficient network bar graph on phones refresh rate is pretty slow so it may not shows the real status og SENDING AN ENCRYPTED SMS MESSAGE If we want to send an encrypted message to the user we must hold the user until advanced user menu opens then select Encrypt SMS button The window opens where we can enter the text we would f D like to send and then press Send SMS button end encrypted sms nd encrypted file Hi this is an encrypted message For receiving an encrypted SMS message we simply click on the URL that is in the standard message This way the digiCRYPT program will decrypt and display the message The user to which we want to send encrypted SMS can be online logged into digiCRYPT or offline he will receive encrypted message as standard SMS message Digicrypt 2 Either the phone number or the public key are missing Before the first message exchange we must do at least one call to the other person so the certificate exchange is preformed In case that
8. takes pretty long to finish the initialization because encoding keys private and public are generated during this first application startup og USING THE XMPP SERVER XMIPP server is used in digiCRYPT application for initial IP exchanging Simply said the calling pho ne checks on XMPP server which IP adress called phone has at the time of a call IP adresses are usually changed with each GPRS UMTS session Afterwards all communication between phones is direct so no call data is going through XMPP server at all An OpenFire XMPP server is suggested to be used with digiCRYPT system info digicrypt info Page 3 9 www digicrypt info Digitech d o o 2012 All rights reserved DigiCRYPT user manuals v 2 1 For testing demo version purposes only the Digitech s XMPP server will be allowed digicrypt mobi when having a full licence we can use any XMPP server og DIGICRYPT APPLICATION We start the digiCRYPT application by starting it via the program shortcut At first application startup we are prompted to select a PIN code which we will use to access digiCRYPT program for further use We must enter PIN twice in order to ensure that we entered it correctly Any character not only num bers can be used for PIN password Minimum allowed PIN length is 4 charac ters The PIN is used together with the phone unique ID to encrypt the applicati on s settings including the RSA private key When we start the appl
9. via Program manager app info digicrypt info Page 8 9 Digitech d o o 2012 All rights reserved gt Logout amp lock Do you want logout and lock digiCrypt www digicrypt info DigiCRYPT user manuals v 2 1 3 USEFUL INFORMATION ABOUT DIGICRYPT INFORMATION ABOUT GSM BUGGING POSSIBILITIES The digiCRYPT application ensures highest level encryption for the phone conversation The conversation is secured all the way between both phones included in the conversation so also in a case of data intercepti on voice data is secured However we must warn about the possiblity of bugging using voice bugs in the area where a call is made Such bug can record transmit the audio from the area where we talk over the phone so for the highest security we suggest communicating outside areas where voice bugs can simply be placed apartment offi ce Car Another possible way to intercept a secured call is some malware virus on the phone which can takes control over microphone and speaker of the mobile phone in the middle attack so we suggest not to install any suspicious software on the mobile phone where digiCRYPT is running info digicrypt info Page 9 9 www digicrypt info Digitech d o o 2012 All rights reserved DigiCRYPT user manuals v 2 1
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