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What is the difference between 40-bit encryption and 128-bit encryption?

40-bit and 128-bit refer to the size of the key used to encrypt information. To use the lock and key analogy, the greater the number of keys, the more difficult it is to find the correct key to fit into the lock that protects the information. Therefore, the larger the size of the encryption level, the more difficult it is to find the right key to unlock the information.