Key and corresponding lock

A key for locking a cylinder lock, comprising:

• at least one first surface and at least one second surface;
• a plurality of sensing positions provided along a longitudinal extent of the key;
• at least one code being provided on the first surface;
• and
• at least one further code being provided on the second surface;
• wherein the codes comprising control points at the plurality of sensing positions provided transversely to the longitudinal extent of the key, arranged at certain control heights and connected by control grooves;
• wherein at least three control grooves are provided, of which at least one control groove is constructed as a deep control groove with deep control points, and the remaining control grooves are constructed as shallow control grooves with shallow control points, wherein each of the at least one control groove constructed as said deep control groove having a larger groove depth than the shallow control grooves, and wherein the shallow control grooves extending essentially parallel to one another;
• wherein at least one control point is provided with a larger diameter, on the at least first surface and on the at least one second surface at least at one sensing position compared to a control point at another sensing position;
• and
• wherein the differently dimensioned control point is part of at least one deep control groove.