Question: The KL-43 was paraded in front of cameras during what political scandal that occurred during the second term of the Reagan administration?

full_context: Document 1: DRYAD: The DRYAD Numeral Cipher/Authentication System (KTC 1400 D) is a simple, paper cryptographic system employed by the U.S. military for authentication and for encryption of short, numerical messages. Each unit with a radio is given a set of matching DRYAD code sheets. A single sheet is valid for a limited time (e.g. 6 hours), called a "cryptoperiod."
Document 2: Iran hostage crisis: The Iran hostage crisis was a diplomatic standoff between Iran and the United States. Fifty-two American diplomats and citizens were held hostage for 444 days from November 4, 1979, to January 20, 1981 after a group of Iranian students belonging to the Muslim Student Followers of the Imam's Line, who supported the Iranian Revolution, took over the U.S. Embassy in Tehran. It stands as the longest hostage crisis in recorded history.
Document 3: House October Surprise Task Force: The House October Surprise Task Force (formally "Task Force of the Committee on Foreign Affairs to Investigate Certain Allegations Concerning the Holding of Americans as Hostages by Iran in 1980") was a task force instituted by the United States House of Representatives in 1992 to examine the October Surprise allegations: that during the 1980 United States presidential election the Reagan campaign had sought to negotiate a solution to the Iran hostage crisis in competition to the US government of Jimmy Carter, in order to prevent the successful resolution of the crisis giving Carter an electoral boost. Following the publication of the report in January 1993, Task Force chairman Rep. Lee H. Hamilton published an editorial in "The New York Times" summarising the Task Force conclusion that "there was virtually no credible evidence to support the accusations."
Document 4: Opposition to military action against Iran: According to most U.S. news networks, a majority of Americans support United States or Israeli military action against Iran. Other, more recent, polls point out that Americans "back a newly brokered nuclear deal with Iran by a 2-to-1 margin and are very wary of the United States resorting to military action against Tehran even if the historic diplomatic effort falls". Organised opposition to a possible future military attack against Iran by the United States (US) and/or Israel is known to have started during 2005–2006. Beginning in early 2005, journalists, activists and academics such as Seymour Hersh, Scott Ritter, Joseph Cirincione and Jorge E. Hirsch began publishing claims that United States' concerns over the allege threat posed by the possibility that Iran may have a nuclear weapons program might lead the US government to take military action against that country. These reports, and the concurrent escalation of tensions between Iran and some Western governments, prompted the formation of grassroots organisations, including Campaign Against Sanctions and Military Intervention in Iran in the US and the United Kingdom, to advocate against potential military strikes on Iran. Additionally, several individuals, grassroots organisations and international governmental organisations, including the Director-General of the International Atomic Energy Agency, Mohamed ElBaradei, a former United Nations weapons inspector in Iraq, Scott Ritter, Nobel Prize winners including Shirin Ebadi, Mairead Corrigan-Maguire and Betty Williams, Harold Pinter and Jody Williams, Campaign for Nuclear Disarmament, Code Pink, the Non-Aligned Movement of 118 states, and the Arab League, have publicly stated their opposition to such an attack.
Document 5: Timeline of the Iran–Contra affair: The Iran–Contra affair was a political scandal in the United States that came to light in November 1986. During the Reagan administration, senior administration officials secretly facilitated the sale of arms to Iran, the subject of an arms embargo. Some U.S. officials also hoped that the arms sales would secure the release of hostages and allow U.S. intelligence agencies to fund the Nicaraguan Contras. Under the Boland Amendment, further funding of the Contras by the government had been prohibited by Congress.
Document 6: Iran–Contra affair: The Iran–Contra affair (Persian: ماجراي ایران-کنترا‎ ‎ , Spanish: "caso Irán-Contra" ), also referred to as Irangate, Contragate or the Iran–Contra scandal, was a political scandal in the United States that occurred during the second term of the Reagan Administration. Senior administration officials secretly facilitated the sale of arms to Iran, which was the subject of an arms embargo. They hoped, thereby, to fund the Contras in Nicaragua while at the same time negotiating the release of several U.S. hostages. Under the Boland Amendment, further funding of the Contras by the government had been prohibited by Congress.
Document 7: Heath Robinson (codebreaking machine): Heath Robinson was a machine used by British codebreakers at the Government Code and Cypher School (GC&CS) at Bletchley Park during World War II in Cryptanalysis of the Lorenz cipher. This achieved the decryption of messages in the German teleprinter cipher produced by the Lorenz SZ40/42 in-line cipher machine. Both the cipher and the machines were called "Tunny" by the codebreakers, who named different German teleprinter ciphers after fish. It was mainly an electro-mechanical machine, containing no more than a couple of dozen valves (vacuum tubes), and was the predecessor to the electronic Colossus computer. It was dubbed "Heath Robinson" by the Wrens who operated it, after cartoonist William Heath Robinson, who drew immensely complicated mechanical devices for simple tasks, similar to (and somewhat predating) Rube Goldberg in the USA.
Document 8: Enigma machine: The Enigma machines were a series of electro-mechanical rotor cipher machines developed and used in the early- to mid-20th century to protect commercial, diplomatic and military communication. Enigma was invented by the German engineer Arthur Scherbius at the end of World War I. Early models were used commercially from the early 1920s, and adopted by military and government services of several countries, most notably Nazi Germany before and during World War II. Several different Enigma models were produced, but the German military models, having a plugboard, were the most complex. Japanese and Italian models were also in use.
Document 9: Debategate: Debategate or briefing-gate was a political scandal affecting the administration of Ronald Reagan; it took place in the final days of the 1980 presidential election. Reagan's team had somehow acquired President Jimmy Carter's briefing papers, classified top secret, that Carter used in preparation for the October 28, 1980 debate with Reagan. The briefing papers were never specified to be vital strategy memos or just routine position papers. This leak of campaign papers was not divulged to the public until late June 1983, after Laurence Barrett published "Gambling With History: Reagan in the White House", an in-depth account of the Reagan administration's first two years.
Document 10: KC 85: The KC 85 ('KC' meaning "Kleincomputer", or "small computer") were models of microcomputers built in East Germany, first in 1984 by Robotron (the KC 85/1) and later by VEB Mikroelektronik "Wilhelm Pieck" Mühlhausen (KC 85/2, KC 85/3 and KC 85/4).
Document 11: Aster CT-80: The Aster CT-80, an early (1982) home/personal computer developed by the small Dutch company MCP (later renamed to Aster Computers), was sold in its first incarnation as a kit for hobbyists. Later it was sold ready to use. It consisted of several Eurocard PCB's with DIN 41612 connectors, and a backplane all based on a 19-inch rack configuration. It was the first commercially available Dutch personal/home computer. The Aster computer could use the software written for the popular Tandy TRS-80 computer while fixing many of the problems of that computer, but it could also run CP/M software, with a big amount of free memory Transient Program Area, (TPA) and a full 80×25 display, and it could be used as a Videotext terminal. Although the Aster was a clone of the TRS-80 Model I it was in fact more compatible with the TRS-80 Model III, and ran all the software of these systems including games. It also had a built in speaker which was compatible with such games software.
Document 12: Tower Commission: The Tower Commission was commissioned on 1 December 1986 by U.S. President Ronald Reagan in response to the Iran Contra scandal. Reagan appointed Republican and former Senator John Tower of Texas, former Secretary of State Edmund Muskie, and former National Security Advisor Brent Scowcroft.
Document 13: KL-43: The KL-43 is a portable, electronic cipher device used by the United States and the NATO from the early 1980s. The machine, manufactured by TRW, is an adaptation of language translator technology, and includes a keyboard for input and an LCD for output. It also contains a built-in modem, a telephone coupler, and the facility for connecting to a printer. A version of the KL-43 was famously used by Oliver North to communicate with his assistant, Fawn Hall, and others while managing clandestine operations in Nicaragua in support of the "Contra" rebels. The device was paraded in front of cameras during the Iran-Contra congressional hearings.
Document 14: Iran–North Korea relations: Iran–North Korea relations (Korean: 이란-조선민주주의인민공화국 관계 ; Persian: روابط ایران و کره‌ی شمالی‎ ‎ ) are described as being positive by official news agencies of the two countries. Diplomatic relations picked up following the Iranian Revolution in 1979 and the establishment of an Islamic Republic. Iran and North Korea pledge cooperation in educational, scientific, and cultural spheres. Some media reports claim this cooperation extends to nuclear cooperation, though official U.S. government publications and academic studies have disputed this. The United States has been greatly concerned by North Korea's arms deals with Iran, which started during the 1980s with North Korea acting as a third party in arms deals between the Communist bloc and Iran, as well as selling domestically produced weapons to Iran, and North Korea continues selling missile to Iran. North Korea and Iran are the remaining two members of George W. Bush's "Axis of evil", which has led to many of the concerns regarding Iran–North Korea relations.
Document 15: TRS-80: The TRS-80 Micro Computer System (TRS-80; later known as the Model I to distinguish it from successors) is a desktop microcomputer launched in 1977 and sold by Tandy Corporation through their Radio Shack stores. The name is an abbreviation of "Tandy/Radio Shack, Z-80 microprocessor". It was one of the earliest mass-produced and mass-marketed retail personal computers.
ground_truth: The Iran–Contra affair