1·The integrity of the message origin needs to be guaranteed (for example, through notary services) to enable validation, auditing, and nonrepudiation when necessary.
必须保证消息源的完整性(如通过公证服务)才能在必要时启用验证、审核和认可。
2·Authentication, encryption, nonrepudiation, and compression.
验证、加密、认可和压缩。