# Tag Info

5

In two key 3DES two keys are equal so that key size is only 112 bits, compared to the 168 bits of full 3DES. The advantage is a smaller key size without a correspondingly large loss in security: both two and three key 3DES can be attacked in about $2^{112}$ time. With the encrypt-decrypt-encrypt construction it clearly must be the first and last key that ...

2

I'll answer your question in order of appearance and leave the ones out which are off-topic here. For example I know you can get the $x/y$ or $x$ or $y$ from your public hexadecimal address, but can you get anything like that from the secret exponent? Not directly. You can use the secret exponent (a.k.a. private key) to calculate the public key ...

2

If we want to make three successive DES encryptions or decryption using 2 secret keys K1, K2 at least one time, and possibly a public constant C0 used as key, we are bound to chose among the following six possibilities (listed by alphabetical order, ignoring configurations equivalent by exchange of K1 and K2); all except number 5 are vulnerable to a basic ...

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