Technical Communications Corporation engages in the design, development, manufacture, distribution, marketing, and sale of communications security devices, systems, and services worldwide. The company primarily provides data, video, fax, and voice networks. Its products include government systems, such as CSD 3324 SE secure telephone, fax, and data system; CSD 3324 SP telephone and fax system; DSD 72A-SP military bulk ciphering system; and DSP 9000 radio encryption system, as well as the HSE 6000 squad radio headset and telephone encryptor for public safety special operations, land mobile radio applications, and for military applications. The company also provides network security systems comprising network encryption systems with centralized key and device management for Internet protocol (IP), Synchronous Optical Network & Synchronous Digital Hierarchy, and frame relay networks to secure data in transit from local area network to local area network and across wide area networks. In addition, it offers secure office systems, such as CSD 4100 executive secure telephone and CipherTalk 8500 IP-based secure wireless phone. The company's products are used to protect confidentiality in communications between radios, landline telephones, mobile phones, facsimile machines, data network equipment over wires, fiber optic cables, radio waves, and microwave and satellite links. Further, it offers funded research and development, and technology development services. The company serves foreign and domestic governmental agencies, law enforcement and military agencies, telecommunications carriers, financial institutions, and multinational companies. It sells directly to customers, original equipment manufacturers, and value-added resellers using its in-house sales force, as well as domestic and international representatives, consultants, and distributors. The company was incorporated in 1961 and is based in Concord, Massachusetts.