Because a MAC can be computed faster than a digital signature, it is practical for transport layer security like SSL, where a large volume of data is transmitted.

由于MAC的计算要比数字签名快，因此它对于诸如ssl等数据传输量很大的传输层安全性来说是实用的。

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Transport-layer security, message-layer security, threat protection, identity and access control – security is truly a first class citizen, and the gateways have the certifications to prove it.

传输层安全、消息级安全、入侵保护、身份认证和访问控制——安全的确是一等公民，而且网关中有证书来证实这一点。

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TLS protocol is an important transport layer security protocol, and is widely used.

TLS协议是一种重要的传输层安全协议，得到了广泛的应用。

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"The presence of armed security personnel in a school adds a layer of security and diminishes the response time that is beneficial to the overall security, " said Asa Hutchinson, a former Republican congressman who led the NRA task force that developed the report.

BBC: NRA calls for armed guards in US schools

"I believe that we introduce a new layer in security, " Givon says.

CNN: Behavioral screening -- the future of airport security?

Sensors allow an added layer of security to regularly scheduled visual inspections.

CNN: Is this the 'safest bridge in America?'