DOCSLIB.ORG

Whatsapp Network Forensics: Decrypting and Understanding the Whatsapp Call Signaling Messages

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Whatsapp Network Forensics: Decrypting and Understanding the Whatsapp Call Signaling Messages Digital Investigation xxx (2015) 1e9 Contents lists available at ScienceDirect Digital Investigation journal homepage: www.elsevier.com/locate/diin WhatsApp network forensics: Decrypting and understanding the WhatsApp call signaling messages * F. Karpisek a, I. Baggili b, , F. Breitinger b a Faculty of Information Technology, Brno University of Technology, Czech Republic b Cyber Forensics Research & Education Group, Tagliatela College of Engineering, ECECS, University of New Haven, 300 Boston Post Rd., West Haven, CT, 06516, USA article info abstract Article history: WhatsApp is a widely adopted mobile messaging application with over 800 million users. Received 10 July 2015 Recently, a calling feature was added to the application and no comprehensive digital Received in revised form 17 September 2015 forensic analysis has been performed with regards to this feature at the time of writing this Accepted 19 September 2015 paper. In this work, we describe how we were able to decrypt the network traffic and Available online xxxx obtain forensic artifacts that relate to this new calling feature which included the: a) WhatsApp phone numbers, b) WhatsApp server IPs, c) WhatsApp audio codec (Opus), d) Keywords: WhatsApp call duration, and e) WhatsApp's call termination. We explain the methods and WhatsApp fi fi Reverse engineering tools used to decrypt the traf c as well as thoroughly elaborate on our ndings with Proprietary protocol respect to the WhatsApp signaling messages. Furthermore, we also provide the commu- Signaling protocols nity with a tool that helps in the visualization of the WhatsApp protocol messages. Network forensics © 2015 Elsevier Ltd. All rights reserved. Decryption Mobile forensics Digital forensics Cyber security Audio encoding Introduction investigation, making the artifacts it produces of compel- ling forensic relevance. Therefore, we see a strong necessity WhatsApp is one of the most widely used personal- for both researchers and practitioners to gain a compre- messaging mobile applications for free texting and con- hensive understanding of the networking protocol used in tent sharing (namely audio, video, images, location and WhatsApp, as well as the type of forensically relevant data contacts), boasting over 800 million users worldwide and it contains. Most importantly, due to the newly introduced was bought by facebook in 2014 for $19 Billion.1 The calling calling feature, it becomes essential to understand the feature was added recently in version 2.11.552, which was signaling messages used in the establishment of calls be- released 2015-03-05 (Arce, 2015). tween the WhatsApp clients and servers. The methods and From its wide adoption, it is obvious how WhastApp tools used in this research could be relevant to in- communication exchanges may be used during an vestigations where proving that a call was made at a certain date and time is necessary. Our contribution outlines the WhatsApp messaging * Corresponding author. protocol from a networking perspective and provides a fi E-mail addresses: xkarpi03@stud. t.vutbr.cz (F. Karpisek), IBaggili@ solution to explore and study WhatsApp network com- newhaven.edu (I. Baggili), [email protected] (F. Breitinger). munications. In terms of novelty, to our knowledge, this is URL: http://www.unhcfreg.com/, http://www.FBreitinger.de/ fi 1 http://money.cnn.com/2014/02/19/technology/social/facebook- the rst paper that discusses the WhatsApp signaling whatsapp/, last accessed 2015-07-03. messages used when establishing voice calls. The work has http://dx.doi.org/10.1016/j.diin.2015.09.002 1742-2876/© 2015 Elsevier Ltd. All rights reserved. Please cite this article in press as: Karpisek F, et al., WhatsApp network forensics: Decrypting and understanding the WhatsApp call signaling messages, Digital Investigation (2015), http://dx.doi.org/10.1016/j.diin.2015.09.002 2 F. Karpisek et al. / Digital Investigation xxx (2015) 1e9 impact on practitioners in the field that have obtained WhatsApp. In their work, they focused on unencrypted network traffic for a potential suspect, as well as providing traffic that could be easily reconstructed. WhatsApp was scientists literature for better understanding the network found to be favorable at encrypting its network traffic when protocol itself. compared to other mobile social-messaging applications. The rest of the paper is organized as follows. In Section Therefore, based on the primarily findings by Walnycky Related work we review existing work, while Section et al. (2015), our study aimed at further investigating and WhatsApp protocol describes the WhatsApp protocol. dissecting the WhatsApp protocol, and in specific, focusing Then, in Section Tool for visualizing WhatsApp protocol on the signaling messages used when establishing What- messages we describe the tool we created for visualizing sApp calls given this new feature. However, in order to dive exchanged WhatsApp messages. In Section Decryption,we deeper into the signaling messages, one must understand describe the process of obtaining decrypted connections some known attributes of the WhatsApp protocol which between the WhatsApp client and the WhatsApp server. we discuss in Section WhatsApp protocol below. Then in Section Findings we examine the message contents and discuss the meaning of the signaling messages during a WhatsApp protocol WhatsApp call. Finally, in Section Conclusions, we offer concluding remarks and outline some future research. WhatsApp uses the FunXMPP protocol for message ex- change which is a binary-efficient encoded Extensible Related work Messaging and Presence Protocol (XMPP) (WHAnonymous, 2015c). The WhatsApp protocol is also briefly described by There has been research conducted on the forensics of LowLevel-Studios (2012) from an implementation perspec- WhatsApp but the majority of that work focused on the tive. To fully describe the FunXMPP protocol is beyond this data that WhatsApp stores on the mobile device when paper's scope. For more information on the protocol the compared to our work which focuses on the network fo- readers may want visit a website outlining the protocol.2 rensics of WhatsApp. Authentication procedure Network protocol forensics There are two types of authentication procedures the At the time of writing this paper, the work on network WhatsApp client can use when connecting to the servers. If protocol forensics of WhatsApp was sparse. The only work it is the first time the client is connecting to the server, a full that provided any detail on WhatsApp's networking pro- handshake is performed as illustrated in Fig. 1. Subse- tocol was the Hancke (2015) report. Hancke (2015)'s work quently, for any consecutive connections, only a half focused more on Realtime Transport Protocol (RTP) media handshake is executed using data provided from the initial streams (Schulzrinne et al., 2003). The report fails to un- full handshake. cover the call signaling messages used by WhatsApp, which We note that a half handshake therefore results in using is elaborated on by our work. the same session keys multiple times, which can be deemed as a plausible protocol security weakness. Mobile device forensics Full handshake Anglano (2014) performed an in-depth analysis of The authentication procedure as described by the de- WhatsApp on Android devices. The work provided a velopers of WhatsAPI consists of three messages comprehensive description of the artifacts generated by (WHAnonymous, 2015a). This is synonymous with the well WhatsApp and discussed the decoding, interpretation and known three-way handshake and is described in detail in relationship between the artifacts. Anglano (2014) was able the following paragraphs. These messages can be observed to provide an analyst with the means of reconstructing the in Fig. 1 which was created using our developed tool (for list of contacts and chronology of the messages that have more details see Section Tool for visualizing WhatsApp been exchanged by users. protocol messages). The works by Thakur (2013) and Mahajan et al. (2013) are As shown in Fig. 1, first, the client sends an <auth> similar to previous studies since they both focused on the message to the server. This message is not encrypted and forensic analysis of WhatsApp on Android. These studies contains the client number and authentication method the uncovered the forensic acquisition of the artifacts left by client wants to use. WhatsApp on the device. Thakur (2013) focused on the Then, the server replies with a <challenge> message forensic analysis of WhatsAppartifacts on an Android phone's containing a 20 byte long nonce for the session key gener- storage and volatile memory. The results showed that one is ation. Session keys are then generated using the Password- able to obtain many artifacts such as phone numbers, mes- Based Key Derivation Function 2 (PBKDF2) algorithm using fi fi sages, media les, locations, pro le pictures, logs and more. the password as a passphrase and the nonce as a salt. Both Mahajan et al. (2013) analyzed WhatsApp and Viber artifacts the server and the client know the password and nonce so using the Cellebrite Forensic Extraction Device (UFED) toolkit. the generated keys are the same on both ends. Four keys are They were able to recover contact lists, exchanged messages and media including their timestamps and call details. Walnycky et al. (2015) examined 20 different popular 2 https://github.com/WHAnonymous/Chat-API/wiki/FunXMPP- mobile social-messaging applications for Android including Protocol, last accessed 2015-07-03.
Load more

Recommended publications
  • Webrtc and XMPP
    webRTC and XMPP Philipp Hancke, XMPP Summit 2013 What is this webRTC thing … …and why should XMPP developers care? . I assume you know what XMPP is… . … you might have heard of Jingle . the XMPP framework for establishing P2P sessions . used for VoIP, filesharing, … . … you might have also heard about this webRTC thing . doing VoIP in the browser . without plugins . „no more flash“ . Do you want to know how it relates to XMPP ? Philipp Hancke © ESTOS GmbH 2013 2 What is webRTC? . P2P sessions between browsers . no servers involved in media transfer . using open standards . Javascript API in the browser . also an BSD-licensed C++ library from Google . Want to know more? . Listen to the evangelists! . Justin Uberti http://www.youtube.com/watch?v=E8C8ouiXHHk . Jose de Castro http://vimeo.com/52510068 . Cullen Jennings http://vimeo.com/cullenfluffyjennings/rtcwebexplained Philipp Hancke © ESTOS GmbH 2013 3 Initiating P2P sessions . initiate a P2P session between two browsers . negotiate media codecs, NAT traversal, etc . media is sent P2P . you need a session initiation protocol . SIP? . JSEP? . H.323? . Jingle! . webRTC does not mandate a signalling protocol . WG decision Philipp Hancke © ESTOS GmbH 2013 4 Call Flow - JSEP Philipp Hancke © ESTOS GmbH 2013 5 Jingle . You can use Jingle as signalling protocol . together with BOSH or XMPP over websockets in the browser . Demo later . But… . webRTC uses the Session Description Protocol as an API . Jingle does not use SDP . You need a mapping SDP -> Jingle -> SDP . Complicated, but doable . Topic for breakout Philipp Hancke © ESTOS GmbH 2013 6 Call Flow - Jingle Philipp Hancke © ESTOS GmbH 2013 7 webRTC-Jingle usecases .
    [Show full text]
  • Cheat Sheet – Common Ports (PDF)
    COMMON PORTS packetlife.net TCP/UDP Port Numbers 7 Echo 554 RTSP 2745 Bagle.H 6891-6901 Windows Live 19 Chargen 546-547 DHCPv6 2967 Symantec AV 6970 Quicktime 20-21 FTP 560 rmonitor 3050 Interbase DB 7212 GhostSurf 22 SSH/SCP 563 NNTP over SSL 3074 XBOX Live 7648-7649 CU-SeeMe 23 Telnet 587 SMTP 3124 HTTP Proxy 8000 Internet Radio 25 SMTP 591 FileMaker 3127 MyDoom 8080 HTTP Proxy 42 WINS Replication 593 Microsoft DCOM 3128 HTTP Proxy 8086-8087 Kaspersky AV 43 WHOIS 631 Internet Printing 3222 GLBP 8118 Privoxy 49 TACACS 636 LDAP over SSL 3260 iSCSI Target 8200 VMware Server 53 DNS 639 MSDP (PIM) 3306 MySQL 8500 Adobe ColdFusion 67-68 DHCP/BOOTP 646 LDP (MPLS) 3389 Terminal Server 8767 TeamSpeak 69 TFTP 691 MS Exchange 3689 iTunes 8866 Bagle.B 70 Gopher 860 iSCSI 3690 Subversion 9100 HP JetDirect 79 Finger 873 rsync 3724 World of Warcraft 9101-9103 Bacula 80 HTTP 902 VMware Server 3784-3785 Ventrilo 9119 MXit 88 Kerberos 989-990 FTP over SSL 4333 mSQL 9800 WebDAV 102 MS Exchange 993 IMAP4 over SSL 4444 Blaster 9898 Dabber 110 POP3 995 POP3 over SSL 4664 Google Desktop 9988 Rbot/Spybot 113 Ident 1025 Microsoft RPC 4672 eMule 9999 Urchin 119 NNTP (Usenet) 1026-1029 Windows Messenger 4899 Radmin 10000 Webmin 123 NTP 1080 SOCKS Proxy 5000 UPnP 10000 BackupExec 135 Microsoft RPC 1080 MyDoom 5001 Slingbox 10113-10116 NetIQ 137-139 NetBIOS 1194 OpenVPN 5001 iperf 11371 OpenPGP 143 IMAP4 1214 Kazaa 5004-5005 RTP 12035-12036 Second Life 161-162 SNMP 1241 Nessus 5050 Yahoo! Messenger 12345 NetBus 177 XDMCP 1311 Dell OpenManage 5060 SIP 13720-13721
    [Show full text]
  • Parental Control – Whatsapp
    Parental controls guide WhatsApp privacy guide Parental Controls information Type of guide Social media privacy guides Features and Benefits WhatsApp privacy settings allow you to restrict who can see your child’s messages and location. There are also ways to block delete or report users on the platform. Please note, WhatsApp new privacy policy has come into effect starting May 15. What specific content can I restrict? Chatting Downloading file sharing Location sharing Privacy Privacy and identity theft What do I need? A WhatsApp account WhatsApp privacy guide Step by step guide 1 Control who sees your information You can set your last seen, profile photo and/or status to the following options: Everyone, My Contacts and Nobody: 1. Open WhatsApp and go to your Settings, tap Account, then tap Privacy. 2. Next, tap your selected option, then choose from either option: ‘Everyone’, ‘My Contacts’ or ‘Nobody’. 3. The changes will be applied automatically. 1 WhatsApp privacy guide 2 3 WhatsApp privacy guide Step by step guide 2 How to block contacts You can stop receiving messages, calls and status updates from certain contacts by blocking them. Open WhatsApp, choose the person you want to block either by searching or scrolling through your chat list. 2. Tap on their name, then scroll down and tap Block Contact. 1 2 WhatsApp privacy guide WhatsApp privacy guide Step by step guide 3 How to report contacts 1. Open WhatsApp, choose the person you want to report either by searching or scrolling through your chat list. 2. Tap on their name, then scroll down and tap Report or Report and Block Contact.
    [Show full text]
  • Enterprise Edition
    Secure Communication. Simplified. SAFECHATS Problem Most companies use popular insecure email and ⛔ messaging services to communicate confidential information P The information flow within the Company is ⛔ disorganized Metadata is exposed and available to third-party ⛔ services SAFECHATS Introducing SAFECHATS Ultra-secure communication solution P Designed with security in mind SAFECHATS Why SAFECHATS? ✔ Information is always end-to-end encrypted by default P ✔ All-in-one communication suite: • Text messaging (one-on-one and group chats) • Voice calls • File transfers (no size and file type limits) SAFECHATS How does SAFECHATS solve the problem? ✔ Customizable white label solution ✔ Integrates with existing softwareP infrastructure ✔ Enterprise-wide account and contact list management, supervised audited chats for compliance SAFECHATS What makes SAFECHATS different? ✔ Your own isolated cloud environment or on-premise deployment P ✔ Customizable solution allows to be compliant with internal corporate security policies ✔ No access to your phone number and contact list SAFECHATS Screenshot Protection ✔ Notifications on iOS P ✔ DRM protection on Android SAFECHATS Identity Verification ✔ Protection from man-in-the-middle attacksP ✔ SMP Protocol SAFECHATS Privacy Features ✔ Show / hide messages and files P ✔ Recall messages and files ✔ Self-destructing messages and files SAFECHATS Additional Protection ✔ History retention control P ✔ Application lock: • PIN-code • Pattern-lock on Android devices • Touch ID on iOS devices SAFECHATS How does SAFECHATS
    [Show full text]
  • Instant Messaging
    Instant Messaging Internet Technologies and Applications Contents • Instant Messaging and Presence • Comparing popular IM systems – Microsoft MSN – AOL Instant Messenger – Yahoo! Messenger • Jabber, XMPP and Google Talk ITS 413 - Instant Messaging 2 Internet Messaging •Email – Asynchronous communication: user does not have to be online for message to be delivered (not instant messaging) • Newsgroups • Instant Messaging and Presence – UNIX included finger and talk • Finger: determine the presence (or status) of other users • Talk: text based instant chatting application – Internet Relay Chat (IRC) • Introduced in 1988 as group based, instant chatting service • Users join a chat room • Networks consist of servers connected together, and clients connect via a single server – ICQ (“I Seek You”) • Introduced in 1996, allowing chatting between users without joining chat room • In 1998 America Online (AOL) acquired ICQ and became most popular instant messaging application/network – AIM, Microsoft MSN, Yahoo! Messenger, Jabber, … • Initially, Microsoft and Yahoo! Created clients to connect with AIM servers • But restricted by AOL, and most IM networks were limited to specific clients • Only recently (1-2 years) have some IM networks opened to different clients ITS 413 - Instant Messaging 3 Instant Messaging and Presence • Instant Messaging – Synchronous communications: message is only sent to destination if recipient is willing to receive it at time it is sent •Presence – Provides information about the current status/presence of a user to other
    [Show full text]
  • XEP-0156: Discovering Alternative XMPP Connection Methods
    XEP-0156: Discovering Alternative XMPP Connection Methods Joe Hildebrand Peter Saint-Andre Lance Stout mailto:jhildebr@cisco:com mailto:xsf@stpeter:im mailto:lance@andyet:com xmpp:hildjj@jabber:org xmpp:peter@jabber:org xmpp:lance@lance:im http://stpeter:im/ 2020-07-07 Version 1.3.1 Status Type Short Name Draft Standards Track alt-connections This document defines an XMPP Extension Protocol for discovering alternative methods of connecting to an XMPP server using two ways: (1) DNS TXT Resource Record format; and (2) Web Host Metadata Link format. Legal Copyright This XMPP Extension Protocol is copyright © 1999 – 2020 by the XMPP Standards Foundation (XSF). Permissions Permission is hereby granted, free of charge, to any person obtaining a copy of this specification (the ”Specification”), to make use of the Specification without restriction, including without limitation the rights to implement the Specification in a software program, deploy the Specification in a network service, and copy, modify, merge, publish, translate, distribute, sublicense, or sell copies of the Specifi- cation, and to permit persons to whom the Specification is furnished to do so, subject to the condition that the foregoing copyright notice and this permission notice shall be included in all copies or sub- stantial portions of the Specification. Unless separate permission is granted, modified works that are redistributed shall not contain misleading information regarding the authors, title, number, or pub- lisher of the Specification, and shall not claim endorsement of the modified works by the authors, any organization or project to which the authors belong, or the XMPP Standards Foundation. Warranty ## NOTE WELL: This Specification is provided on an ”AS IS” BASIS, WITHOUT WARRANTIES OR CONDI- TIONS OF ANY KIND, express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE.
    [Show full text]
  • How Secure Is Textsecure?
    How Secure is TextSecure? Tilman Frosch∗y, Christian Mainkay, Christoph Badery, Florian Bergsmay,Jorg¨ Schwenky, Thorsten Holzy ∗G DATA Advanced Analytics GmbH firstname.lastname @gdata.de f g yHorst Gortz¨ Institute for IT-Security Ruhr University Bochum firstname.lastname @rub.de f g Abstract—Instant Messaging has gained popularity by users without providing any kind of authentication. Today, many for both private and business communication as low-cost clients implement only client-to-server encryption via TLS, short message replacement on mobile devices. However, until although security mechanisms like Off the Record (OTR) recently, most mobile messaging apps did not protect confi- communication [3] or SCIMP [4] providing end-to-end con- dentiality or integrity of the messages. fidentiality and integrity are available. Press releases about mass surveillance performed by intelli- With the advent of smartphones, low-cost short-message gence services such as NSA and GCHQ motivated many people alternatives that use the data channel to communicate, to use alternative messaging solutions to preserve the security gained popularity. However, in the context of mobile ap- and privacy of their communication on the Internet. Initially plications, the assumption of classical instant messaging, fueled by Facebook’s acquisition of the hugely popular mobile for instance, that both parties are online at the time the messaging app WHATSAPP, alternatives claiming to provide conversation takes place, is no longer necessarily valid. secure communication experienced a significant increase of new Instead, the mobile context requires solutions that allow for users. asynchronous communication, where a party may be offline A messaging app that claims to provide secure instant for a prolonged time.
    [Show full text]
  • Ethics of Facebook: Analyzing the Social Network and Global Leader
    Ethics of Facebook: Analyzing the Social Network and Global Leader A Thesis Submitted to the Faculty of the School of Engineering and Applied Science University of Virginia • Charlottesville, Virginia In Partial Fulfillment of the Requirements of the Degree Bachelor of Science, School of Engineering Selwyn Hector Spring 2020 On my honor as a University Student, I have neither given nor received unauthorized aid on this assignment as defined by the Honor Guidelines for Thesis-Related Assignments Signature __________________________________________ Date __________ Selwyn Hector Approved __________________________________________ Date __________ Michael Gorman, Department of Engineering and Society Ethics of Facebook: Analyzing the Social Network and Global Leader Introduction As computing technology has grown, the internet and computers have become an essential part of people’s daily lives. According to data from the US Census, 81% of United States homes had a computer with internet access in 2016 and 76% of households had at least 1 one smartphone. Facebook is one of the internet’s largest services with 1.59 billion daily active 2 users and 2.41 billion monthly active users as of June 2019. ​ Facebook’s massive user base gives ​ it a platform to influence many parts of the world. Facebook began as a platform for connecting college students but now is a behemoth in entertainment, news, advertising, and more. Small decisions in how content is prioritized and what content is allowed to be posted have consequences across many cultures. This enormous power makes Facebook not only a social network that connects friends but a global leader that shapes the future. Unfortunately, the platform has been at the center of many controversies related to user 3,4 privacy, misinformation, and hate speech.
    [Show full text]
  • What Is Whatsapp? Whatsapp Is a Mobile Phone Application That Allows Users to Send Messages to Individuals and Groups, As Well As Share Images and Documents
    What is WhatsApp? WhatsApp is a mobile phone application that allows users to send messages to individuals and groups, as well as share images and documents. WhatsApp is a useful tool when you want to communicate with a group—such as all the nurses on your unit. It is less cumbersome than starting a texting group using everyone’s personal mobile phone. How to set up WhatsApp on your mobile phone Go to the App Store for your iPhone or Open Google Play on your Android Install “WhatsApp” Once you have the App on your phone: Go to “Settings” and add a photo and a status message (optional) The App will draw from directly your contacts in your phone and identified people who have WhatsApp How to set up a group chat Open WhatsApp On the bottom of the screen there are options to make calls, send texts etc. Click on the Chat Bubble which will take you to the screen where you message with your contacts From here there are two ways of creating a new group: Click on NEW GROUP on the top right of your screen This will take you to your contact list. Type a name in the search bar at top, or go down the list and tap everyone you would like in the group (a little blue check will show up next to their name). Click NEXT The next page is where you can give your group a name, and add a picture that represents the group (optional) SECOND WAY TO CREATE A GROUP CHAT: Back on the main chat page, you can click on the icon of a note being written all the way at the top right of the page Which will take to the next page offering you the option of creating a new group.
    [Show full text]
  • Is Bob Sending Mixed Signals?
    Is Bob Sending Mixed Signals? Michael Schliep Ian Kariniemi Nicholas Hopper University of Minnesota University of Minnesota University of Minnesota [email protected] [email protected] [email protected] ABSTRACT Demand for end-to-end secure messaging has been growing rapidly and companies have responded by releasing applications that imple- ment end-to-end secure messaging protocols. Signal and protocols based on Signal dominate the secure messaging applications. In this work we analyze conversational security properties provided by the Signal Android application against a variety of real world ad- versaries. We identify vulnerabilities that allow the Signal server to learn the contents of attachments, undetectably re-order and drop messages, and add and drop participants from group conversations. We then perform proof-of-concept attacks against the application to demonstrate the practicality of these vulnerabilities, and suggest mitigations that can detect our attacks. The main conclusion of our work is that we need to consider more than confidentiality and integrity of messages when designing future protocols. We also stress that protocols must protect against compromised servers and at a minimum implement a trust but verify model. 1 INTRODUCTION (a) Alice’s view of the conversa-(b) Bob’s view of the conversa- Recently many software developers and companies have been inte- tion. tion. grating end-to-end encrypted messaging protocols into their chat applications. Some applications implement a proprietary protocol, Figure 1: Speaker inconsistency in a conversation. such as Apple iMessage [1]; others, such as Cryptocat [7], imple- ment XMPP OMEMO [17]; but most implement the Signal protocol or a protocol based on Signal, including Open Whisper Systems’ caching.
    [Show full text]
  • Portable Wi-Fi Calling and Interactive Voice Response System
    www.ijemr.net ISSN (ONLINE): 2250-0758, ISSN (PRINT): 2394-6962 Volume-7, Issue-1, January-February 2017 International Journal of Engineering and Management Research Page Number: 384-386 Portable Wi-Fi Calling and Interactive Voice Response System Ruchi W. Kasare1, Pooja K. Muneshwar2, Nikhil D. Tembhekar3, Prof. V. P. Yadav4, Prof. J. V. Shriral5 1,2,3,4,5Department of Computer Science and Engineering, Priyadarshani College of Engineering and Research, Nagpur University, Maharashtra, INDIA ABSTRACT Wireless IP-PBX utilizes WIFI technology for Implementation of a VoIP telephony system using communication, the same wireless infrastructure used for an IP Telephony solution in the organization as IVR. A new your corporate network. Just as we use mobiles and technology VoIP or Internet Telephony means that your laptops within this wireless infrastructure to gain access voice is carried over the IP network, otherwise known as to information, now we can use wireless IP phones the Internet. Voice which is an analog signal, is converted system as this system uses the telephony function to digital data, which is then disassembled and transmitted through the Internet or Internet to be recovered back to an directly into an already existing data network. This analog signal an the other using an IP Telephony solution provides an advantage that voice and data network can which is an Linux base system. be used together using single system. One of the major This service can be properly managed and advantages of the IP-PBX wireless phone is that you can deployed over a network with less stress and expenses.
    [Show full text]
  • National Security Agency | Cybersecurity Information Selecting
    National Security Agency | Cybersecurity Information Selecting and Safely Using Collaboration Services for Telework - UPDATE Summary During a global pandemic or other crisis contingency scenarios, many United States Government (USG) personnel must operate from home while continuing to perform critical national functions and support continuity of government services. With limited access to government furnished equipment (GFE) such as laptops and secure smartphones, the use of (not typically approved) commercial collaboration services on personal devices for limited government official use becomes necessary and unavoidable. We define collaboration services as those capabilities that allow the workforce to communicate via internet-enabled text, voice, and video, and can include the sharing of files and other mission content. Collaboration can occur between two people or widened to include a large group to support mission needs. This document provides a snapshot of best practices and criteria based on capabilities available at the time of publication and was coordinated with the Department of Homeland Security (DHS), which has released similar guidance: “Cybersecurity Recommendations for Federal Agencies Using Video Conferencing” [1] and “Guidance for Securing Video Conferencing” [2]. This NSA publication is designed to provide simple and actionable considerations for individual government users. The intent of this document is not meant to be exhaustive or based on formal testing, but rather be responsive to a growing demand amongst the federal government to allow its workforce to operate remotely using personal devices when deemed to be in the best interests of the health and welfare of its workforce and the nation. Recommendations in this document are likely to change as collaboration services evolve and also address known vulnerabilities and threats.
    [Show full text]