gnus-mime-security-button-end-line-format

gnus-mime-security-button-end-line-format is a variable defined in `gnus-art.el'.
Its value is

"%{%([[End of %t]%D]%)%}
"

Documentation:
The following specs can be used:
%t The security MIME type
%i Additional info
%d Details
%D Details if button is pressed