Type: string
Default: "%4n %t%f %4l/0x%k %-4a %2c %u"
This variable allows you to customize the PGP key selection menu to your personal taste. This string is similar to ``index_format'', but has its own set of printf()-like sequences:
%n number
%k key id
%u user id
%a algorithm
%l key length
%f flags
%c capabilities
%t trust/validity of the key-uid association
%[<s>] date of the key where <s> is an strftime(3)
expression