underlying security

For example, most of the Web-based systems for banking domains implementing a basic two-factor authentication scheme either use SSL/ TLS or HTTPS protocol ( Secure HyperText Transfer Protocol, RFC 2660) as the underlying network security mechanism.

例如，大多数基于Web的银行系统使用SSL/TLS或HTTPS协议（Secure HyperText Transfer Protocol，RFC2660）作为底层网络安全机制实现基本的两因素身份验证。

But the point to note is that in both the factors ( of the two-factor authentication), the system makes use of the same underlying security mechanism ( SSL/ TLS/ HTTPS) for network authentication.

但是要注意一点：对于两因素身份验证的两个因素，系统使用相同的底层安全机制（SSL/TLS/HTTPS）实现网络身份验证。

In this paper, we mainly discuss the derivative security pricing problem for the untradable underlying assert.

作者主要讨论了标的资产为不可交易情形下衍生证券的定价问题.

Note that the tokens are opaque binary data, and only the underlying security mechanism needs to be able to interpret them.

注意，标志（token）是隐性二进制数据，只有底层安全性机制才需要能够解释它们。

Buy back that option if underlying security reaches your stop level.

如果相对的证券到了止损点,你要买回期权.