An architecture for a block cipher, where the architecture includes functional units that are logically reconfigurable so as to be able to both encrypt clear text into cipher text and decrypt cipher text into clear text using more than one block cipher mode based on at least one of advanced encryption standard and data encryption standard. Each volume has an exclusive volume log table and an exclusive volume block update table. The combination of candidate merge bits which minimizes the absolute cumulative DSV is selected when a subsequent group of possible combinations of candidate merge bits is detected or after a predetermined delay, and the selected combination of candidate merge bits is inserted between the two successive data symbols. This is capable of acting on the supplementary product held on one side by the suction element in such a way that the said supplementary product is bent at least approximately in a V shape. Adjacent longitudinal segments are joined by flexible interconnection segments that permit the stent to bend laterally. An anchor is oriented at right angles to the longitudinal axis.