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A cipher which uses a different encryption key every time, as long as the message. The key is XOR'ed with the message to render the cipher text which can then be XOR'ed with the same key to get the plain text.
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one-time pad key related attack
When people say never use twice the same key to encrypt two different messages, they mean never use the same keystream. Here, if your keystream generation is truly random, then it is ok. If your messa …