D. Thomas and T. Bradshaw, April) Rapid Rise of Chat Apps Slims Texting Cash Cow for Mobile Groups, Online. Financial Times, issue.0, pp.226-82, 2013.

.. J. Paczkowski, WhatsApp: Bigger Than Twitter. On- line. All Things D, 2013.

G. Greenwald, June) NSA Collecting Phone Record of Millions of Verizon Customers Daily. Online. The Guardian, 2013.

J. Vincent, Aliations, Emotion and the Mobile Phone, in Cross-Modal Analysis of Speech, Gestures, Gaze and Facial Expressions, ser. Lecture Notes in Computer Science, p.2841, 2009.

R. Ling, New Tech, New Ties: How Mobile Communication Is Reshaping Social Cohesion, 2008.

J. Laugesen and Y. Yuan, What Factors Contributed to the Success of Apple's iPhone? in Proceedings of the 2010 Ninth International Conference on Mobile Business / 2010 Ninth Global Mobility Roundtable, ser. ICMB-GMR '10, p.9199, 2010.

R. N. Akram, K. Markantonakis, and K. Mayes, Building the Bridges A Proposal for Merging dierent Paradigms in Mobile NFC Ecosystem, The 8th International Conference on Computational Intelligence and Security, 2012.

A. Shabtai, Y. Fledel, U. Kanonov, Y. Elovici, S. Dolev et al., Google Android: A Comprehensive Security Assessment, IEEE Security & Privacy Magazine, vol.8, issue.2, p.3544, 2010.
DOI : 10.1109/MSP.2010.2

M. Becher, F. C. Freiling, J. Homann, T. Holz, S. Uellenbeck et al., Mobile Security Catching Up? Revealing the Nuts and Bolts of the Security of Mobile Devices, 2011 IEEE Symposium on Security and Privacy, 2011.
DOI : 10.1109/SP.2011.29

A. Technica, Available: http://arstechnica.com/security/2014/02/ crypto-weaknesses-in-whatsapp-the-kind-of-stu-the-nsa-would-love, 2014.

. H. Online and . Scalability, Available: http://highscalability.com/blogthe-whatsapp-architecture-facebook-bought-for-19-billion, 2014.

A. Freier, P. Karlton, and P. Kocher, August) RFC:6101 -The Secure Sockets Layer (SSL) Protocol Version 3.0. Online. IETF. 13. (2011, Marrch) Security of BlackBerry PIN-to-PIN Messaging. Online . Communications Security Establishment Canada, 2011.

T. Dierks and E. Rescorla, RFC 5246 -The Transport Layer Security (TLS) Protocol Version 1.2, Tech. Rep, 2008.
DOI : 10.17487/rfc4346

M. Landman, Managing smart phone security risks, 2010 Information Security Curriculum Development Conference on, InfoSecCD '10, p.145155, 2010.
DOI : 10.1145/1940941.1940971

A. P. Felt, S. Egelman, and D. Wagner, I've got 99 problems, but vibration ain't one, Proceedings of the second ACM workshop on Security and privacy in smartphones and mobile devices, SPSM '12, p.3344, 2012.
DOI : 10.1145/2381934.2381943

M. L. Polla, F. Martinelli, and D. Sgandurra, A Survey on Security for Mobile Devices, IEEE Communications Surveys & Tutorials, vol.15, issue.1, p.446471, 2013.
DOI : 10.1109/SURV.2012.013012.00028

C. Alexander and I. Goldberg, Improved user authentication in off-the-record messaging, Proceedings of the 2007 ACM workshop on Privacy in electronic society , WPES '07, p.4147, 2007.
DOI : 10.1145/1314333.1314340

G. Belvin, A Secure Text Messaging Protocol, Cryptology ePrint Archive, 2014.

C. E. Dyreson and R. T. Snodgrass, Timestamp semantics and representation, Information Systems, vol.18, issue.3, p.143166, 1993.
DOI : 10.1016/0306-4379(93)90034-X

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.31.5057

R. N. Akram, K. Markantonakis, and K. Mayes, Pseudorandom Number Generation in Smart Cards: An Implementation, Performance and Randomness Analysis, 2012 5th International Conference on New Technologies, Mobility and Security (NTMS), 2012.
DOI : 10.1109/NTMS.2012.6208760

R. Rogers, J. Lombardo, Z. Mednieks, and B. Meike, Android Application Development: Programming with the Google SDK, 2009.

L. Wall, The Perl Language Reference Manual (for Perl version 5.12.1), 5th ed., ser. Perl Reference Manual (for Perl version 5.12.1. United Kingdom: Network Theory Ltd Available: http://www.network-theory.co.uk/docs, November) PHP Cryptogrpahy Extensions: Mcrypt. Online. PHP. [Online]. Available, 2010.

. Mosquitto, An Open Source MQTT v3.1/v3.1.1 Broker

P. Saint-andre, Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence, Internet RFC, vol.3921, 2004.
DOI : 10.17487/rfc6121

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.642.1819

T. Bray, Extensible Markup Language -SW (XML-SW), Tech. Rep, 2002.

C. Bouncy-castle, . Package, and . Online, Bouncy Castle