Cylinder lock and locking tumbler

A cylinder lock comprising:

• a cylinder shell;
• a key plug rotationally mounted in said cylinder shell to provide a shear line between the cylinder shell and the key plug;
• a longitudinal key slot extending into said key plug generally parallel to a rotational axis thereof for receiving a key blade, the key blade having an elongated generally longitudinally extending wave-like code pattern;
• a row of lock tumblers, each of said tumblers having a body part and a finger, each of the body parts of the tumblers being non-rotatably guided for elevational movement only in an associated transverse cavity in said key plug, each of the fingers of the tumblers projecting transversely outwardly from said body part to extend into said key slot and engage the code pattern of a properly shaped key blade inserted into the key slot, said fingers being located in such predetermined positions that a free end portion of each finger forms a specific, irregular longitudinal distribution pattern different from a longitudinal distribution of the tumbler body parts;
• and
• a fence member for blockingly associating the locking tumblers with the cylinder shell so that elevational positioning of said locking tumblers with said properly shaped key blade enables clearance of the shear line.