I'm not quite sure whether irreversible encryption is a thing in this context (its sometimes used to talk about e.g. password storage, but I think that's a very different use-case), so I'll sally in with an interesting tangent:

https://en.wikipedia.org/wiki/Homomorphic_encryption

   Homomorphic encryption is a form of encryption that allows
   computation on ciphertexts, generating an encrypted result
   which, when decrypted, matches the result of the 
   operations as if they had been performed on the plaintext.

   Homomorphic encryption can be used for secure outsourced
   computation
   ...