Stream versus block cipher analogy

We have two teams of four people who have been tasked with unloading one five-ton lorry full of skittles and placing them in a room on the bottom floor of a building.

There are skittles in boxes and there are skittles which have been placed loose. One of the teams has loose skittles that need to be bagged and the other lorry has boxes of skittles. It is obvious that the team with boxes of skittles will win:

  • Initialization Vector (IV): This is an arbitrary number that can be used along with a secret key for data encryption. This number, also called a nonce, is employed only one time in any session. The IV length is usually comparable to the length of the encryption key or the block of the cipher in use. ...

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