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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 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 ...
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.
Live streaming. In August 2015, Facebook began to allow users to live stream video. Streams appear on the News Feed, and users can comment on them in real-time. Live broadcasts are automatically saved as a video post to the streamer's page. The feature was positioned as a competitor to services such as Meerkat and Periscope.
training key - (NSA) unclassified key used for instruction and practice exercises. Type 1 key - (NSA) keys used to protect classified information. See Type 1 product. Type 2 key - (NSA) keys used to protect sensitive but unclassified (SBU) information. See Type 2 product. Vernam key - Type of key invented by Gilbert Vernam in 1918. See stream key.
Facebook Watch (currently rebranding to Facebook Video) is a video on demand service operated by American company Meta Platforms (previously named Facebook, Inc.). The company announced the service in August 2017 and it was available to all U.S. users that month. Facebook Watch's original video content is produced for the company by others, who ...
Here is a look at the key events that have unfolded since late last year. NOVEMBER 16, 2023 Cassie says in a lawsuit that Combs subjected her to years of abuse, including beatings and rape.
In 2021, an internal document leak from the company then known as Facebook (now Meta Platforms, or Meta) showed it was aware of harmful societal effects from its platforms, yet persisted in prioritizing profit over addressing these harms. The leak, released by whistleblower Frances Haugen, resulted in reporting from The Wall Street Journal in ...