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Stream cipher. The operation of the keystream generator in A5/1, an LFSR-based stream cipher used to encrypt mobile phone conversations. A stream cipher is a symmetric key cipher where plaintext digits are combined with a pseudorandom cipher digit stream (keystream). In a stream cipher, each plaintext digit is encrypted one at a time with the ...
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 ...
Keystream. In cryptography, a keystream is a stream of random or pseudorandom characters that are combined with a plaintext message to produce an encrypted message (the ciphertext). The "characters" in the keystream can be bits, bytes, numbers or actual characters like A-Z depending on the usage case. Usually each character in the keystream is ...
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: where xor is performed bit by bit.
Salsa20 and the closely related ChaCha are stream ciphers developed by Daniel J. Bernstein. Salsa20, the original cipher, was designed in 2005, then later submitted to the eSTREAM European Union cryptographic validation process by Bernstein. ChaCha is a modification of Salsa20 published in 2008. It uses a new round function that increases ...
Activity stream. 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.
Block cipher. In cryptography, a block cipher is a deterministic algorithm that operates on fixed-length groups of bits, called blocks. Block ciphers are the elementary building blocks of many cryptographic protocols. They are ubiquitous in the storage and exchange of data, where such data is secured and authenticated via encryption.
The network address it used at the time – facebookcorewwwi.onion – is a backronym that stands for Facebook's Core WWW Infrastructure. [7] In April 2016, it had been used by over 1 million people monthly, up from 525,000 in 2015. [3] Google does not operate sites through Tor, and Facebook has been applauded for allowing such access, [11 ...