The length of the encryption key is the unit a bit. One of the bits in a binary computer that contain the values 0 and 1 are the key with a length of 1-bit numbers, it is possible to replace the key with 0 or 1 of 2-bit length key figures as possible is 0, 1, 2, and 3, respectively. 3-bit length key figures as possible to between 0 and 7, so when adding a key for every 1 bit length value of the key will increase the key twice or a number that is likely to increase to 2 times 7.
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