Abstract type for key from string representation.

Item Summary
Name	Type	Multiplicity	Description
privateKey	property ProtectedStringType	[1,1]
passphrase	property ProtectedStringType	[1,1]
certificate	property ProtectedStringType	[1,1]

Items
- privateKey
  
  Flags: RAM,runtime
  
  Multiplicity: [1,1]
- passphrase
  
  Flags: RAM,runtime
  
  Multiplicity: [1,1]
- certificate
  
  Flags: RAM,runtime
  
  Multiplicity: [1,1]