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formatting, it's meet not meetin and attack instead of attach
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Maarten Bodewes ♦
Maarten Bodewes ♦
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First, 2-key-3DES is significantly different from 2DES (which provides little additional security over DES due tobecause of MeetinMeet-in-the-Middle-Attachs attacks). 2-key-3DES does Encryptencrypt with key1, Decrypt with key2 and encrypt with key1 again (instead of a fresh key).

Now DES indeed uses arbitrary bitstrings as keys (possibly filtered for the know weak keys and a 2-key 3DES uses a pair of these bitstrings which means you'll end up with something close to $\{0,1\}^{112}$.

First, 2-key-3DES is significantly different from 2DES (which provides little additional security over DES due to Meetin-in-the-Middle-Attachs). 2-key-3DES does Encrypt with key1, Decrypt with key2 and encrypt with key1 again (instead of a fresh key).

Now DES indeed uses arbitrary bitstrings as keys (possibly filtered for the know weak keys and a 2-key 3DES uses a pair of these bitstrings which means you'll end up with something close to $\{0,1\}^{112}$

First, 2-key-3DES is significantly different from 2DES (which provides little additional security over DES because of Meet-in-the-Middle attacks). 2-key-3DES does encrypt with key1, Decrypt with key2 and encrypt with key1 again (instead of a fresh key).

Now DES indeed uses arbitrary bitstrings as keys (possibly filtered for the know weak keys and a 2-key 3DES uses a pair of these bitstrings which means you'll end up with something close to $\{0,1\}^{112}$.

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Christoph Egger
Christoph Egger
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First, 2-key-3DES is significantly different from 2DES (which provides little additional security over DES due to Meetin-in-the-Middle-Attachs). 2-key-3DES does Encrypt with key1, Decrypt with key2 and encrypt with key1 again (instead of a fresh key).

Now DES indeed uses arbitrary bitstrings as keys (possibly filtered for the know weak keys and a 2-key 3DES uses a pair of these bitstrings which means you'll end up with something close to $\{0,1\}^{112}$