With the growing popularity of Asynchronous Transfer Mode and frame relay services,encrypting data at the packet level is becoming an attractive alternative to the conventional method of securing transactions on a link-by-link basis.

• 随着异步传输模式（ATM）和帧中继服务的日渐流行（信息）包级上的数据加密正在成为一种链路到链路基础上使交易安全进行的颇有吸引力的常规替代办法。