Question: In cryptography, MAGENTA is a symmetric key block cipher developed fo a a German telecommunications company formed in what year?

full_context: Document 1: Serpent (cipher): Serpent is a symmetric key block cipher that was a finalist in the Advanced Encryption Standard (AES) contest, where it was ranked second to Rijndael. Serpent was designed by Ross Anderson, Eli Biham, and Lars Knudsen.
Document 2: RC6: In cryptography, RC6 (Rivest cipher 6) is a symmetric key block cipher derived from RC5. It was designed by Ron Rivest, Matt Robshaw, Ray Sidney, and Yiqun Lisa Yin to meet the requirements of the Advanced Encryption Standard (AES) competition. The algorithm was one of the five finalists, and also was submitted to the NESSIE and CRYPTREC projects. It was a proprietary algorithm, patented by RSA Security.
Document 3: Camellia (cipher): In cryptography, Camellia is a symmetric key block cipher with a block size of 128 bits and key sizes of 128, 192 and 256 bits. It was jointly developed by Mitsubishi Electric and NTT of Japan. The cipher has been approved for use by the ISO/IEC, the European Union's NESSIE project and the Japanese CRYPTREC project. The cipher has security levels and processing abilities comparable to the Advanced Encryption Standard.
Document 4: Datang Telecom Group: Datang Telecom Group (officially Datang Telecom Technology & Industry Group) is a Chinese telecommunications equipment group headquartered in Beijing, China. The group was founded in September 1998 by the China Academy of Telecommunications Technology, which acted as the parent company of the group. It is best known for its leading role in developing the Chinese TD-SCDMA 3G mobile telecommunications standard through subsidiary DT Mobile (formerly known as Datang Mobile).
Document 5: Block cipher: In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called a "block", with an unvarying transformation that is specified by a symmetric key. Block ciphers operate as important elementary components in the design of many cryptographic protocols, and are widely used to implement encryption of bulk data.
Document 6: BTCL: BTCL or Bangladesh Telecommunications Company Limited is the largest telecommunications company in Bangladesh. The company was founded as the Bangladesh Telegraph & Telephone Board (BTTB) following Bangladesh's independence in 1971. On July 1, 2008 the BTTB became a public limited company and was renamed as BTCL. The Bangladesh government initially owned all BTCL shares, but stated it would sell the shares to the public the following year. The value of BTCL is estimated to be at ৳15,000 crore (৳150 billion). BTCL has a total of 12,636 officials and staff.
Document 7: CBC-MAC: In cryptography, a cipher block chaining message authentication code (CBC-MAC) is a technique for constructing a message authentication code from a block cipher. The message is encrypted with some block cipher algorithm in CBC mode to create a chain of blocks such that each block depends on the proper encryption of the previous block. This interdependence ensures that a change to any of the plaintext bits will cause the final encrypted block to change in a way that cannot be predicted or counteracted without knowing the key to the block cipher.
Document 8: GOST (block cipher): The GOST block cipher (Magma), defined in the standard GOST 28147-89 (RFC 5830), is a Soviet and Russian government standard symmetric key block cipher with a block size of 64 bits. The original standard, published in 1989, did not give the cipher any name, but the most recent revision of the standard, GOST R 34.12-2015, specifies that it may be referred to as Magma. The GOST hash function is based on this cipher. The new standard also specifies a new 128-bit block cipher called Kuznyechik.
Document 9: Twofish: In cryptography, Twofish is a symmetric key block cipher with a block size of 128 bits and key sizes up to 256 bits. It was one of the five finalists of the Advanced Encryption Standard contest, but it was not selected for standardization. Twofish is related to the earlier block cipher Blowfish.
Document 10: MAGENTA: In cryptography, MAGENTA is a symmetric key block cipher developed by Michael Jacobson Jr. and Klaus Huber for Deutsche Telekom. The name MAGENTA is an acronym for Multifunctional Algorithm for General-purpose Encryption and Network Telecommunication Applications. (The color magenta is also part of the corporate identity of Deutsche Telekom.) The cipher was submitted to the Advanced Encryption Standard process, but did not advance beyond the first round; cryptographic weaknesses were discovered and it was found to be one of the slower ciphers submitted.
Document 11: Romtelecom: Romtelecom was the largest telecommunications company in Romania; the majority of shares were held by the Greek telecommunications company OTE (54.01% of shares). The Romanian state also had a minority stake of 45.99% in the company. The company had a monopoly for the provision of fixed telephony services until January 1, 2003. Currently, according to the OTE Group 2006 1st Quarter Results Press Release, Romtelecom has 3,835,647 fixed telephony lines, down from 4,279,038 at the end of 1st quarter 2005. As of 24 March 2013 when Zapp network operating on CDMA was closed down, Romtelecom remained with the only CDMA network in the country until 1 January 2015 when the network was shut down, putting an end to CDMA technology in the country.
Document 12: Telecom Italia: Telecom Italia is an Italian telecommunications company headquartered in Rome, which provides telephony services, mobile services, and DSL data services. It was founded in 1994 by the merger of several state-owned telecommunications companies, the most important of which was Società Italiana per l'Esercizio Telefonico p.A., (known as "SIP", from the earlier "Società Idroelettrica Piemontese"), the former state monopoly telephone operator in Italy.
Document 13: Tanzania Telecommunications Company Limited: Tanzania Telecommunications Company Limited (TTCL) is the oldest and largest fixed line telecommunications company in Tanzania. The company comes forth from the former Tanzania Posts and Telecommunications Corporation in 1993. TTCL was wholly owned by the Government of Tanzania until the partial privatisation of the company on 23 February 2001.
Document 14: Deutsche Telekom: Deutsche Telekom AG (   ) (short form in writing only: DT, English: "German Telecom" ) is a German telecommunications company headquartered in Bonn. Deutsche Telekom was formed in 1996, as the former state-owned monopoly Deutsche Bundespost was privatized.
Document 15: Magyar Telekom: Magyar Telekom Nyrt. (Magyar Telekom Távközlési Részvénytársaság – Hungarian Telekom Telecommunications Plc.) is the largest Hungarian telecommunications company. The former monopolist is now a subsidiary of Deutsche Telekom (in 59.21% of shares). Until 6 May 2005, it was (and informally still is) known as "MATÁV" ("Magyar Távközlési Rt." - Hungarian Telecommunications PLC.). The company was formed under the name of "Magyar Távközlési Vállalat" (Hungarian Telecommunications Enterprise) in December 1989, when "Magyar Posta" (Hungarian Post) was split to three separate enterprises. On 31 December 1991, the company was re-structured as a Public Limited Company, as "Magyar Távközlési Rt.", and the company remained in 100% state ownership until the end of 1993. On 1 July 1993, the Telecommunications Act came into effect, and now it was possible to privatise the company. A consortium was formed by Deutsche Telekom and Ameritech International, which was named "MagyarCom", and bought into the company a share of 30.1% for a price of 875 million USD.
ground_truth: 1996