Stream ciphers are based on generating a possible infinite cryptographic keystream of random data. They take one output bit (or byte) at a time, and use it to encrypt the corresponding bit (or byte) of input data.
Stream ciphers work on continuous stream of plaintext data and they do not divide it into smaller blocks.
One-Time Pad (OTP) is a symmetric stream cipher, with a quite easy algorithm and an excellent level of provided protection.
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RC4 is a symmetric stream cipher, known and praised for its speed and simplicity.
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Salsa20 is a symmetric stream cipher, which is generally considered to be well-designed and effective.
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CSS symmetric stream cipher designed to protect DVD content.
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