Stream ciphers, where plaintext bits are combined with a cipher bit stream by an exclusive-or operation (xor), can be secure if used properly. However, they are vulnerable to attacks if certain precautions are not followed: Keys must never be reused.
Stream ciphers, where plaintext bits are combined with a cipher bit stream by an exclusive-or operation (xor), can be secure if used properly. However, they are vulnerable to attacks if certain precautions are not followed: Keys must never be reused.
Source: Wikipedia "Stream cipher attacks" · CC BY-SA 4.0
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