Abstract: Locking arrangement having a lock cylinder with an associated key (1), in particular a flat turning key, wherein a core (2) of the lock cylinder has a keyway (3) which is open in the direction of an end side of the cylinder, is provided with profile ribs/grooves and in the center thereof the vertex of a conical opening (4), which opens in the direction of the end side of the cylinder, is located. At an insertion end, the key (1) forms a tip (5) with flanks (6) in the form of arcuate lines. The tip (5) is formed by two arcuate lines (6), of which a point of intersection is located in a broad-side center (7) of the key, and a tangent angle (delta) at the point of intersection (5) is greater than the vertex angle (&mgr;) of the cone opening (4), wherein the arcuate lines (6) have bevels (9), in the direction of the mutually opposite broad sides (8), having a bevel angle (omega) which is smaller than the vertex angle (&mgr;) of the cone opening (4).