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Since the early days of TCP, port scanning has been used by computer saboteurs to locate vulnerable systems. In a new set of top secret documents seen by Heise, it is revealed that in 2009, the British spy agency GCHQ made port scans a "standard tool" to be applied against entire nations (Figure 1, see the picture gallery). Twenty-seven countries are listed as targets of the HACIENDA program in the presentation (Figure 2), which comes with a promotional offer : readers desiring to do (...)