In simple words:
LMK : MAIN OR MOTHER KEYS. UNDER THIS KEYS ALL THE FUTURE GENERATED KEYS WILL BE SAVED. You need to save this LMKs in the either chip card format of paper. Mostly used it Chip card, thales provides you with this cards.
ZPK: Zone Pin Key. used for pinblock generation
ZMK: Zone Master Key, VIsa calls it ZCMK. Its a transport key. Whenever you want to comunicate with another system. And u dont want to EXPOSE the CLEAR COMPONENTs you can use a ZMK to transport them. What you will do, you will invoque 3 custodians, Each of the them will generate a clear ZMK component. Then u will form a ZMK criptogram with those 3 clear components. After that you can export any key under that ZMK. For the other party to get the key. U will need to send them by email the key (ex ZPK) ZPK under ZMK, and the from each custodian has to send to a specific person its clear component. In the other company they will form the ZMK from the clear component and just import the key.
LMK : MAIN OR MOTHER KEYS. UNDER THIS KEYS ALL THE FUTURE GENERATED KEYS WILL BE SAVED. You need to save this LMKs in the either chip card format of paper. Mostly used it Chip card, thales provides you with this cards.
ZPK: Zone Pin Key. used for pinblock generation
ZMK: Zone Master Key, VIsa calls it ZCMK. Its a transport key. Whenever you want to comunicate with another system. And u dont want to EXPOSE the CLEAR COMPONENTs you can use a ZMK to transport them. What you will do, you will invoque 3 custodians, Each of the them will generate a clear ZMK component. Then u will form a ZMK criptogram with those 3 clear components. After that you can export any key under that ZMK. For the other party to get the key. U will need to send them by email the key (ex ZPK) ZPK under ZMK, and the from each custodian has to send to a specific person its clear component. In the other company they will form the ZMK from the clear component and just import the key.