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An activity stream is a list of recent activities performed by an individual, typically on a single website. For example, Facebook 's News Feed is an activity stream. Since the introduction of the News Feed on September 6, 2006, [ 1 ] other major websites have introduced similar implementations for their own users.
In April 2016, Facebook unveiled a live-streaming API, aimed to allow developers to use any device, including professional video cameras and drones, to integrate with the live-video streaming platform. [109] [110] Facebook also updated its mobile app to provide a dedicated section for showcasing current and recent live broadcasts. [111] To ...
[27] [28] [29] Facebook introduced key features like the News Feed, which became central to user engagement. By late 2007, Facebook had 100,000 pages on which companies promoted themselves. [30] Facebook had surpassed MySpace in global traffic and became the world’s most popular social media platform.
Key generation, distribution and management are critical for those applications. A stream cipher makes use of a much smaller and more convenient key such as 128 bits. Based on this key, it generates a pseudorandom keystream which can be combined with the plaintext digits in a similar fashion to the one-time pad. However, this comes at a cost.
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Stream ciphers are vulnerable to attack if the same key is used twice (depth of two) or more. Say we send messages A and B of the same length, both encrypted using same key, K. The stream cipher produces a string of bits C(K) the same length as the messages. The encrypted versions of the messages then are: E(A) = A xor C
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