# Tag Info

## New answers tagged key-reuse

0

With this cipher, it's pretty easy to retrieve at least 1 key that is consistent with 2 pairs of plaintext,ciphertext . (Other ciphers are better or worse at making it nearly impossible to recover even 1 key consistent with the given plaintext,ciphertext). With this cipher, it is not possible to fully retrieve the key from only 2 known pairs of ...

0

There is a straightforward brute force method. For example, take the lowest $8$ bits of everything and check for valid values of $K_1$ and $K_2$, mod $2^8$. You will need about $2^{16}$ checks to get the lower $8$ bits of $K_1$ and $K_2$. Proceed then to values mod $2^{16}$, as you know the lower $8$ bits of $K_1$ and $K_2$, only bits $8\dots15$ of these ...

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