Advanced Encryption Standard (AES)
An algorithm for the encryption of electronic data. It has growingly replaced Data Encryption Standard (DES) nowadays. It adopts the symmetric-key algorithm, which indicates that the same key is used for both encrypting and decrypting the data.
Administrative Unit 4 (AU-4)
Affidavit Identification Number (AIN)
Available Second (AS)
A measure of time during which service is available to the paying customer.
Asynchronous Transfer Mode (ATM)
A standard switching technique that can be used to carry many different service types such as voice, video, or data all over one network. It does this by dividing the data stream into fixed length cells of size 53 bytes, which thus can be more easily implemented in hardware. ATM also goes by the connection-oriented model which establishes a "virtual circuit" connection between data points before it transmits data.