If you are following a technical manual with this title, it likely details these phases:

Verifying the integrity of the transformed key using a checksum or digital signature.

Recent research in Ukraine discusses digital transformation of public services using distributed ledger technology (blockchain) . In these systems, "key transformation" is the process of generating public keys from private keys using elliptic curve cryptography, governed by specific state security "instructions". Typical Steps in a Key Transformation "Instruction"

Depending on the specific field, this topic generally covers:

Formatting the initial "raw" key according to specific padding rules.