Heißluftgebläse. Credit: Museum in der Runde Ecke

The next artifact in my list is the “Heißluftgebläse”—a hot air blower constructed by the Stasi for opening envelopes and packages sealed with rubberized self-adhesive tape. Unlike the various steam methods the Stasi employed, which only worked on water-based glues and could potentially damage the contents of letters, this machine was used to focus hot, dry air directly to the flap in order to soften and release the adhesive.

Like other “hacked” machines constructed for postal surveillance the Stasi Operative-Technical Sector fashioned this blower using off the shelf, reused, and hand-made parts. In this case, they adopted a commercially-available vacuum cleaner to force air through a heating cartridge and down a steel tube towards a platform where workers laid envelopes. At the end of the tube there is a metal apparatus that could be used to focus the hot air and gently pry the envelope flap open. Impressively, the Runde Ecke index states this method be used to open up to 150 letters per hour.

Heißluftgebläse. April and July Credit: Wikepedia user Appaloosa

I’m particularly interested in the different representations of this machine. In these two photographs, both posted by the same Wikipedia user in 2008 just months apart, it appears there were two separate machines on exhibit. This is suggested by comparing the scratches on the base and stand. Yet, while they are clearly different, they are strangely positioned in exactly the same location—an exhibition at the Museum in der Runde Ecke which contains objects found in the Leipziger district administration for state security (BVfS)—with other obvious differences. In the 22 April photo (left) the vacuum cleaner is still attached, showing how the machine was originally used. But in the 27 July image the vacuum and tape have been removed. Was it needed for cleaning in the museum? Where could it have gone? There are additional small differences that point to these being distinct machines, the most noticeable of which is that a different bracket is holding the heating apparatus.

It’s thanks to deviations like this that the telling of the story of Stasi postal surveillance continues to evolve. Aesthetic decisions that seem inconsequential—like a museum staff member replacing the device with the yellowing tape with the one that doesn’t look as disheveled—change how we are able to perceive the past. Here, those moments which make the economic and material constraints the Stasi OTS experienced while hacking and iterating across their analog surveillance devices become less clear. While, thanks to the BTsU we are fortunate to be able to dissect and interpret the methods of the Stasi, it is not possible to collect everything. This unfortunately obscures the parallels with our 21st century hacker culture that, like the Stasi, have grown into immense organizations intent on perfecting and perpetuating their power through surveillance.

1. Heißluftgebläse zum öffnen von gummierten selbstklebenden Briefen (Inventory no. 00020). Objekt- und Fotodatenbank Online im Museum in der Runden Ecke. Accessed June 13, 2017.
2. BStU. Die Stasi und das Postgeheimnis. Accessed June 10, 2017.

Credit: BStU

Since hot steam could damage sensitive contents like photographs, the Stasi used the C-83 (“Cellophan 83”) “cold steam” generating device to open those letters. Produced in Hungary, the C-83 used a special film (cellophane) stretched over a tray filled with distilled water. Up to 25 letters could be placed on the film, flaps down, so that when the water in the tray was heated to 50ºC the “cold steam” diffused through the film and dissolved the glue on the envelope flaps.

The procedure was time-consuming because cold steam dissolved the glue at a much slower rate than the hot steam method. Once the glue started to soften, workers had could only lift the letters off the foil for a short time in order to carefully open them using a special spatula.

Credit: BStU

It is unclear if this is an original mass-produced device or is a product modified by the Stasi OTS. It is constructed of painted sheet metal, cast plastic, and other materials that suggest it was primarily constructed in a factory, though it is possible the Stasi made modifications to assist in letter-opening.

Credit: Museum in der Runde Ecke

Credit: Museum in der Runde Ecke

Credit: Museum in der Runde Ecke

1. Kaltdampf-Öffnungsgerät zum öffnen von Briefen (Zellofanbodengerät) (Inventory no. 00006). Objekt- und Fotodatenbank Online im Museum in der Runden Ecke. Accessed June 13, 2017.
2. BStU. Die Stasi und das Postgeheimnis. Accessed June 10, 2017.

Credit: Museum in der Runde Ecke

If the “W”-shaped, two-letter steam distribution grid was an “upgrade,” then the ultimate “deluxe” Stasi steam device for manually opening letters with hot water vapor is the “Arbeitstisch der Heißdampf-Öffnungsanlage 532” (English: Work Table for Hot Steam Opening System 532). This modular table was constructed for Department M by the Operational-Technical Sector (OTS) of the MfS in the late 1970’s for manually steaming open envelopes with water-soluble adhesives. The Museum in der Runde Ecke has two of these modified working tables. There is no information on whether “532” is the model number or series number (which would imply there were 531 other models!), and unfortunately I did not record the plate on the front last time in Leipzig, so I cannot confirm its contents until I return.

Credit: Museum in der Runde Ecke

One of the Runde Ecke tables has its own power supply which could be connected to up to three other units to supply power in series (a.k.a. “daisy chaining”). In the center of each table is a “W”-shaped vapor dispersion grid on which two envelopes could be placed. Under the plate is the steam generator, which contained a heater, water storage, and float. While in operation a storage vessel for distilled water was placed underneath. The unit was operated by turning the rotary switch (positions: 0 = “off”, 1 = “pause”, and 2 = “full”) on the attached control panel. Two control lights indicated the operating state of the table, a yellow light which lit when the table was on, and a red light which illuminated when the float inside the steam generator detected that the water was low.

Credit: Museum in der Runde Ecke

To use the table MfS staff turned the steam generator dial to the “full” position. This activated the heater inside the water receptacle. Once the water reached the correct temperature and began to evaporate the staff placed the flap of the letters on the angles of the W-shaped mesh grids. The vapor, which could reach temperatures of to 100ºC, emerged from the W and dissolved the adhesive. A towel was stretched over the opening to prevent water buildup. Up to 100 letters (between private citizens of the GDR) per hour could be opened on this device.

Stasi staff using the “Work Table for Hot Steam Opening System 532.” Credit: BStU, MfS, Dept. M, Fo 0031, figure 0003

Of the devices I’ve examined so far, this table has little outright evidence that it contains modified parts. Unlike the “hacker aesthetic” of other devices, attention has been given to the various additions to the table to match them to the original. The control panels use commercially-available switches and indicators and are constructed with sheet steel and painted to match the bluish grey steel of the tables. The “W” mesh steam dispersion grid appears to be constructed of aluminum or another treated metal that would not oxidize, and is attached to the table using a plate with measured and symmetrical fasteners. Like the Stasi organization itself, which over time refined their methods according their ideology and what was available, the sharp edges and reused parts on this transformed table are concealed to match the professionalism, efficiency, and attention to detail with which the workers were expected to perform their tasks.

Credit: Owen Mundy

1. Work Table for Hot Steam Opening System 532 (Inventory no. 00007). Objekt- und Fotodatenbank Online im Museum in der Runden Ecke. Accessed June 10, 2017.
2. Work Table for Hot Steam Opening System 532 (Inventory no. 00354). Objekt- und Fotodatenbank Online im Museum in der Runden Ecke. Accessed June 10, 2017.
3. BStU. Die Stasi und das Postgeheimnis. Accessed June 10, 2017.

Credit: Museum in der Runde Ecke

Like other devices constructed in the 1970’s and ‘80s by Department M and the Stasi OTS, this “Aufdampftopf” (“steam pot”) was fashioned using a basic household appliance as a starting point. Starting with a “cooking pot,” as it’s called in the Museum in der Runde Ecke index, the vessel was altered with a tight lid so it could be used to heat water (added via the attached funnel) and generate, collect, and disperse steam for opening letters.

The “W” shape of the vapor dispersing grid on top corresponds to the adhesive edges of, not one, but two envelopes placed end to end on the mesh. Presumably an administrator or other coworker made a human mechanical observation in the spirit of efficiency, suggesting that if the grid was expanded then workers could open two envelopes at once.

Like the Kleindampfentwickler with vapor dispersion grid on its top, the Dampfentwickler made from a steam pot also uses copper tubes and plating in its construction. Likewise, the steam pot additions exhibit a DIY aesthetic that contrasts with the mass produced original object. The copper, again chosen for its malleability and capacity to withstand water, shows signs of use in its darkening patina. It gives the steam pot the appearance of a prop for a dystopian science fiction film, or at least a reference to a real thing, inspiring one to think of a steampunk look popular among cosplayers.

Credit: Museum in der Runde Ecke

The Stasi’s practice of taking bits and pieces from whatever was available might have been based on scarcity given the economic constraints in communist GDR, but their hacked outcomes have a specific “remix aesthetic,” to borrow the term Eduardo Navas uses in his book Remix Theory: The Aesthetics of Sampling. Specifically, the Stasi’s reuse and appropriation of objects and materials towards utilitarian ends expresses itself in the same way the “sampling” of a DJ or musician might. Given the motivations for, uses of, and choices in construction of this device—to secretly open personal communications between individuals and examine their contents (which of course happens on the part of governments and corporations nowadays)—an art historian or anthropologist might term this a classic example of “early hacker”.

1. Steam generator for opening letters (Inventory no. 00042). Objekt- und Fotodatenbank Online im Museum in der Runden Ecke. Accessed June 10, 2017.

The Museum in der Runde Ecke in Leipzig has an amazing collection of devices found in the Leipziger district administration office (BVfS) during the dissolution of the Stasi. These are listed online in a thorough index with photos and descriptions. Their images are much better than those I was able to make through the glass of their museum displays, and while I’ve contacted the Citizen’s Committee about making new ones, they hopefully won’t mind if I reproduce some of them here in the meantime.

Credit: Museum in der Runde Ecke

This steam generator was used, like the Kleindampfentwickler in my previous post, for opening “suspicious” letters. The Stasi Department M works directed the steam from the nozzle at the envelope to loosen the water-soluble glue on the flap. Like the Kleindampfentwickler, it was originally a mass-produced device (the Runde Ecke description states it was originally a medical inhaler). It has a glass tube indicating water level, and was stored in a case containing other working materials (which were not preserved) such as “ether, distilled water, glue, knife, scissors, brushes, adhesive strips and cleaning cloths.”

1. Steam generator for opening letters (Inventory no. 00031). Objekt- und Fotodatenbank Online im Museum in der Runden Ecke. Accessed June 10, 2017.

Department M, along with the Stasi OTS (Operativ-Technische Sektor), developed and implemented numerous technical tools, intelligence checks, and operational activities to speed their postal surveillance in the GDR. By the 1970’s, the department was already using various modified household appliances or industrial devices to assist in steaming open and closing letters. One example is this “Kleindampfentwickler”—a “small steam generator,” which appears to be a modified espresso maker or water boiler, with an added, V-shaped steam outlet.

The Kleindampfentwickler (Credit: BStU)

The materials and intentional flat and curved lines in the design of the chrome base and plastic handle suggest it was mass produced. The Stasi probably chose the kettle for the wide base and low placement of the electrical connection which serve to keep the center of gravity low and prevent tipping. They used a V-shape for this and other steam outlets to match the angled shape of envelope flaps. This one is designed to loosen the glue on a single envelope, while other steam outlets could accommodate more.

The crude construction of the modified steam outlet sharply contrasts with the retail-ready kettle. The choice of soldered copper for the material of the pipe leading upwards and steam outlet were probably based on what was available, water resistant, and easy to work with. Copper is used for speciality roofs and gutters, with the seams joined together using heat and solder. The joinery on the Stasi’s addition is not pretty, making it stand out against the base, but it exemplifies the experimental methodologies of the engineers who worked behind closed doors, as well as the belief the aesthetics or secrecy of their work would never be scrutinized.

The Kleindampfentwickler Operational Carrying Case (Credit: BStU)

In the beginning of the 1970s most of the work of Department M was performed by hand. This labor included sorting and selecting suspicious mail, manually steaming it open, examining the contents, transcribing, copying or photographing the interior or exterior of the letter, in some cases, examining the letter for conspiratorial or stealth writing, resealing the envelope, and placing the letter back into circulation at Deutsche Post. As the secret operations heightened the suspicions during the Cold War, and with the postal service increasingly relied upon for cross-border communications thanks to the Berlin Wall preventing face to face meetings, Department M received more pressure to increase their efficiency through mechanical means.

One such machine used by the Stasi was referred to as the “PiD Trap.” This electronic device automatically scanned and screened regular letters from printed materials like newspaper excerpts, church letters, and advertisements. Like the organizational systems the Stasi employed, this apparatus made it possible to divide and focus the labor of their workers and expedited the sorting and determination of suspicious mail and “negative” or “hostile” influences from the west in the form of Politisch-ideologische Diversion (PiD). (Labrenz-Weiß, 28)

1. Hanna Labrenz-Weiß, Abteilung M (MfS Handbuch). Hg. BStU. Berlin 2005.

Today I made this diagram to describe the manual labor and flow of mail from the Deutsche Post stream through the Stasi’s Department M surveillance operations. It’s a fairly boring flow chart but gets at the heart of the organizational processes and divisions of labor they developed to speed their work.

During the seven years Gerd Reinicke worked for Department M the scope of surveillance grew steadily. This is particularly evident in the 1980s, when as the government became more and more concerned of the “class struggle,” they dramatically increased the number of operators in Department M, more than doubling the size from 1980 to 1989.

Stasi Dept. M – Total employees (data from Abteilung M (MfS Handbuch). Hg. BStU. Berlin 2005.)

Reinicke and his coworkers in the “Evaluation and Information” unit constantly tried to increase the “Trefferquote” or “hit rate” of material worthy of confiscation by memorizing large numbers of postal codes, names, and handwriting. Their shift managers carefully sampled the work of individual employees, checking for missed letters, which could result in punishment and disciplinary measures.

Once a citizen or group had been classified as “operationally interesting” then all their mail was withheld for inspection. Citizens of the GDR who sent private messages critical of the government or its leaders through the mail first, had their mail confiscated, and second could be brought to court on charges of “anti-state agitation” according to Section 106 of the Criminal Code of the GDR. (Reinicke, 105)

1. Reinicke, Gerd. “Mitlesen für den Klassenkampf: Postkontrolle der Stasi”. In: Heimliche Leser in der DDR: Kontrolle und Verbreitung unerlaubter Literatur (ed. Siegfried Lokatis). Berlin, 2008.