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-[examples]
-
-A simple policy:
-
- $ cpabe-enc pub_key security_report.pdf 'foo and (bar or bif)'
-
-A complex policy specified on stdin:
-
- $ cpabe-enc pub_key security_report.pdf
-.br
- (sysadmin and (hire_date < 946702800 or security_team)) or
-.br
- (business_staff and 2 of (exec_level >= 5#4, audit_group, strat_team))
-.br
- ^D
-
-[policy language]
-
-Policies are specified using simple expressions of the attributes
-given to cpabe-keygen (1). The most basic policy consists of a single
-such attribute. It will only match keys produced by giving that
-attribute (possibly among others) to cpabe-keygen (1).
-
-Another type of policy consists of a comparison between an attribute
-name and a non-negative integer. The following comparisons are
-allowed: `<', `>', `<=', `>=', and `='. In this case, the attribute
-used must be a numerical attribute and specified appropriately to
-cpabe-keygen (1) (see its man page for details). Note that a
-comparison with an explicit length integer (e.g., "exec_level >= 5#4")
-can only match an attribute with the same length (so "exec_level =
-8#4" will match but "exec_level = 8#5" will not).
-
-Policies of these two basic types may be combined using the the
-keywords `and' and `or' (which may not be used as attributes), as
-shown in the first example above. The `and' operator has higher
-precedence than `or', and parenthesis may be used to specify other
-groupings.
-
-Policies may also be combined using a threshold gate operator, written
-as `K of (P1, P2, ... PN)', where K is a positive integer less than or
-equal to N, and P1, ... PN are policies. Such a policy will only be
-satisfied by a key that satisfies at least K of the policies P1, ...
-PN. An example of the threshold gate operator is included as part of
-the policy in the second example above.
-
-Note that attribute names are case sensitive and must begin with a
-letter, and the keywords `and', `or', and `of' may not be used. Also,
-`&' and `|' are synonyms for `and' and `or'.
-
-[see also]
-.BR cpabe-setup (1),
-.BR cpabe-keygen (1),
-.BR cpabe-dec (1)