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You cannot encrypt 720 bits plaintext using just AES-128. AES is a 128 bit block cipher. Such a block cipher has an input of 128 bits of plaintext and an output of 128 bits ciphertext; and that's it. You need some kind of construction to make block ciphers encrypt larger or smaller plaintext. Such constructions are known as (block cipher) modes of ...


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Take a look https://en.wikipedia.org/wiki/Triple_DES It is original DES with three different keys successively 3 × 56 = 168. In such way length of key increased 3x, but hardness much more. You would use google for "Triple AES". My first try give me this: Would a "Triple AES" (in the sense of how Triple Des works) serve for a dramatic increase in ...


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This begs the question, why would you in any real-world circumstance wish to reduce the difficulty for an attacker to break your cryptosystem? To answer your question practically, the only reasonable way I can think of to accomplish this is to simply reduce the entropy in the key. At 100%, all 128 bits of the key are used. At 50%, 64 bits of the key are ...



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