Kaid's Blog

A Case Study On End-to-End Encryption Used In Whatsapp 1.Introduction to End-to-End Encryption WhatsApp's end-to-end encryption is available when you and the people you message use the latest versions of the app. WhatsApp's end-to-end encryption ensures only you and the person you're communicating with can read what is sent, and nobody in between, not even WhatsApp. This is because your messages are secured with a lock, and only the recipient and you have the special key needed to unlock and read them. For added protection, every message you send has its own unique lock and key. WhatsApp, since its inception six years ago, has quickly grown into a global phenomenon, becoming one of the most popular mobile based communications applications in the world today. With a user base that eclipsed one billion in February, WhatsApp provides a service that potentially endangers the privacy of over 10% of the entire human population. In order to address these security concern

Columnar Transposition Cipher Introduction  The columnar transposition cipher is a fairly simple, easy to implement cipher. It is a transposition cipher that follows a simple rule for mixing up the characters in the plaintext to form the ciphertext. Although weak on its own, it can be combined with other ciphers, such as a substitution cipher, the combination of which can be more difficult to break than either cipher on it's own. The  ADFGVX cipher uses a columnar transposition to greatly improve its security. Example  The key for the columnar transposition cipher is a keyword e.g.  GERMAN . The row length that is used is the same as the length of the keyword. To encrypt a piece of text, e.g. defend the east wall of the castle we write it out in a special way in a number of rows (the keyword here is  GERMAN ): G E R M A N d e f e n d t h e e a s t w a l l o f t h e c a s t l e x x In the above example, the plaintext has been padded so that it neatly fits in a

Convolution<title> <meta name="description" content="Digital Signal Processing (Linear Circular Convolution Using Circular Method),basics of convolution"> <meta name="keywords" content="Digital Signal Processing, Linear Circular Convolution Using Circular Method,Convolution,DSP"> </h1> <div> <div class="separator" style="clear: both; text-align: center;"> </div> <div style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"> <a href="about:invalid#zClosurez" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"></a><a href="about:invalid#zClosurez" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"></a>Convolution is a mathematical way of combining two signals to form a third signal. It is the s