A tamper-proof lock cylinder comprising an axially extended stator (2, 3, 4), a cylindrical channel extending for the full axis of said stator (2, 3, 4), a control cam (6, 7, 8) comprising a cylindrical bushing (6, 7) positioned rotatably in said cylindrical channel and a pawl supported by said cylindrical bushing (6, 7), a right rotor (9, 21) and respectively a left rotor (10, 22) actuating said control cam (6, 7, 8) positioned in said cylindrical channel, said stator (2, 3, 4) comprising a central stator portion in which said cylindrical bushing (6, 7) is positioned, a right side stator portion having, in cooperation with said right rotor (9, 21), a right encryption of the cylinder, a left side stator portion having, in cooperation with said left rotor (10, 22), a left encryption of said cylinder, a facilitated breakage right section and respectively a facilitated breakage left section connecting said right stator portion and respectively said left stator portion to said central stator portion; - said right rotor (9, 21) and respectively said left rotor (10, 22) comprise a right rotor body and respectively a left rotor body, positioned in said right side stator portion and respectively said left side stator portion, and a right rotor extension and respectively a left rotor extension, solidly constrained in rotation with said right rotor body and respectively said left rotor body, and positioned in said central stator portion; - said right rotor extension and respectively said left rotor extension are engaged and axially blocked into a right side of said cylindrical bushing (6, 7) and respectively a left side of said cylindrical bushing (6, 7); - inside said cylindrical bushing (6, 7) there is a slide (31, 32, 33, 34, 35) axially slidable between a disconnected positioned and a connected position solidly constrained in rotation of said cylindrical bushing (6, 7) selectively with either said right rotor extension or said left rotor extension; said central stator portion has a first security pin and respectively a second security pin radially slidable relative to the axis of said cylindrical channel to solidly constrain said cylindrical bushing (6, 7) in rotation with said right rotor extension and respectively said left rotor extension characterized in that - said stator (2, 3, 4) supports a first breakage sensor of said facilitated breakage right section and a second breakage sensor of said facilitated breakage left section; - said central stator portion has a first actuating element of said first security pin controlled by said second breakage sensor and a second actuating element of said second security pin controlled by said first breakage sensor. - said right rotor (9, 21) and respectively said left rotor (10, 22) comprise a right rotor body and respectively a left rotor body, positioned in said right side stator portion and respectively said left side stator portion, and a right rotor extension and respectively a left rotor extension, solidly constrained in rotation with said right rotor body and respectively said left rotor body, and positioned in said central stator portion; - said right rotor extension and respectively said left rotor extension are engaged and axially blocked into a right side of said cylindrical bushing (6, 7) and respectively a left side of said cylindrical bushing (6, 7); - inside said cylindrical bushing (6, 7) there is a slide (31, 32, 33, 34, 35) axially slidable between a disconnected positioned and a connected position solidly constrained in rotation of said cylindrical bushing (6, 7) selectively with either said right rotor extension or said left rotor extension; - said stator (2, 3, 4) supports a first breakage sensor of said facilitated breakage right section and a second breakage sensor of said facilitated breakage left section; - said central stator portion has a first actuating element of said first security pin controlled by said second breakage sensor and a second actuating element of said second security pin controlled by said first breakage sensor.