Berlin Wall near Potsdamer Platz where the stretch of both walls is marked, giving visitors an impression of the dimension of the barrier system. After the fall of Berlin Wall, there were initiatives that they want to preserve the death strip walkways and redevelop it into a hiking and cycling area, known as Berliner Mauerweg. It is part of the initiative by Berlin Senate since 2005. For many years after reunification, people in Germany talked about cultural differences between East and West Germans (colloquially "Ossis" and "Wessis"), sometimes described as "Mauer im Kopf" (The wall in the head). A September 2004 poll
Meet-in-the-middle attack of several functions (or block ciphers) such that the forward mapping through the first functions is the same as the backward mapping (inverse image) through the last functions, quite literally "meeting" in the middle of the composed function. For example, although Double DES encrypts the data with two different 56-bit keys, Double DES can be broken with 2 encryption and decryption operations. The multidimensional MITM (MD-MITM) uses a combination of several simultaneous MITM attacks like described above, where the meeting happens in multiple positions in the composed function. Diffie and Hellman first proposed the meet-in-the-middle attack on a hypothetical expansion