Secure Data Device (SDD)

Secure Data Devices (SDDs) protect classified Government data transmissions. SDDs provide Secure Telephone Unit (STU)-III/Secure Telephone Equipment (STE) secure data transmission functions without voice features and is fully interoperable with all other STU-III/STE products. It allows the user to access a computer database, send a facsimile message, or use email and be sure the information is protected. The SDD was developed under the Government’s STU-III/STE program and is approved for use by Federal departments, agencies, and Government contractors.