How strong is the encryption provided by 64/128/192-bit keys?
The encryption strength is usually measured by the amount of “work” (time and computational resources) required to find correct key to decrypt the data. The strength of the encryption depends on the length of the key, i.e. 192-bit key length is the strongest and 64-bit key length is the least strong. The encryption strength increases exponentially with the length of the key. In order words, an increase in key length of 1 bit (e.g. from 128 to 129) doubles the amount of “work” required to find the correct key. Therefore, 192 bits key length provides about a trillion times more strength than 128 bits key length. And similarly, 128 bits key length provides about a trillion times more strength than 64 bits key length.
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