Suppose that someone suggests the following way to securely confirm that the two of you are both in possession of the same secret key. you create a random bit string the length of the key, xor it with the key, and send the result over the channel. your partner xors the incoming block with the key and sends it back. you check, and if what you receive is your original random string, you have verified that your partner has the same secret key. is this scheme secure?

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science is the study of the nature and behavior of natural things and the knowledge that we obtain about them. a science is a particular branch of science such as physics, chemistry, or biology. physics is the best example of a science which has developed strong, abstract theories.

pseudoscience is a collection of beliefs or practices mistakenly regarded as being based on scientific method.

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explanation:

assault rifle is a rapid-fire, magazine-fed rifle designed for military use. it is a shoulder-fired weapon that allows the shooter to select between semi-automatic (requiring you pull the trigger for each shot), fully automatic (hold the trigger and the gun continuously fires) or three-shot-burst modes.