One of the functions used in ITUbee's round function is $L$ which is defined as $L(A, B, C, D, E) = [E \oplus A \oplus B, A \oplus B \oplus C, B \oplus C \oplus D, C \oplus D \oplus E, D \oplus E \oplus A]$. Is this operation invertible?


Yes, it's invertible. Consider:

$(E \oplus A \oplus B) \oplus (B \oplus C \oplus D) \oplus (C \oplus D \oplus E)$

to get the value of $A$. The values of $B, C, D$ and $E$ can be calculated in a similar manner.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.