What’s the difference between strong and weak encryption?
Caesar’s simple substitution key is an example of weak encryption because
it is easy to decrypt even without the algorithm and key. Unauthorized
decryption is sometimes referred to as breaking or cracking a code. You
could crack Caesar’s code in several ways.
You could discover the key by making 25 different transformation tables,
each with a different offset (assuming that the encryption method uses the
letters of the alphabet in sequence and not at random). You could also ana-
lyze the frequency with which letters appear—in English documents, E, T,
A, O, and N appear most frequently—and you can piece together the mes-
sage by guessing the remaining letters.
Strong encryption is loosely defined as “very difficult to break.” AES
(Advanced Encryption Standard), the technology used for WPA2, is one
of the strongest cryptographic algorithms. With continuous advances in
technology, however, strong encryption is a moving target. Several encryp-
tion methods that were considered impossible to break ten years ago have
recently been cracked.
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