Change Passphrase in SED in GKM

Hi Guys,

I have 10 PCs with SED 10.3.2 in GKM. Each PC has 5 users who authenticate at different times. So, the same user can authenticate to the 10 PCs. Therefore, in each of the 10 PCs is the private key of each of the 5 users in their respective profile.

As I can proceed to change the phassprase one or all users ..?

Thank you for your help.

NOTE: Therefore, emerged the question of how to change the passphrase if in SKM ...?