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Poisson and Binomial both the distribution are used for defining discrete events.You can tell that Poisson distribution is a subset of Binomial distribution. Binomial is the most preliminary distribution to encounter probability and statistical problems. On the other hand when any event occurs with a fixed time interval and having a fixed average rate then it is Poisson distribution.
First i will explain the binomial expansion
Normal distribution is the continuous probability distribution defined by the probability density function. While the binomial distribution is discrete.
They are both continuous, symmetric distribution functions.
They are all the same.
The only difference is that a binomial has two terms and a polynomial has three or more terms.
Secret key cryptography is also known symmetric key cryptography. So there is no difference between the two.
Symmetric means the same each side, assymetric is different each side.
Symmetric key cryptography is also called secret key cryptography. Basic difference between symmetric and public key cryptography is that in symmetric key there only one key while in public key there are two keys one is kept public and other private.
Asymmetric is the opposite of symmetric