# Can Hill Cipher be considered as Asymmetric?

I know hill cipher is a block chipher ,We produce decryption key by inverse of key matirx but we still use different key for decryption. Therefore Can we say that Hill cipher is asymmetric chipher?

• Think of the inverse key as the output of a block cipher key schedule, the same way AES uses InvMixColumns to generate decryption subkeys in the Equivalent Inverse version of the cipher – Richie Frame Jun 2 '15 at 10:13

No, because matrix inversion can be done efficiently. Namely, if encryption is multiplication by a matrix $A$, then you can define decryption with $A$ as first computing the inverse of $A$ and then multiplying.