8、网络安全防御与评估的高效策略

网络安全防御与评估的高效策略

1. 防御效益判定算法

在网络安全防御中，判断一种防御措施是否具有效益是关键环节。以下是一个用于判定防御是否有利可图的算法：

Algorithm 2. Determine if a defence is profitable
Input: Defence δ
Input: Cost c(δ) of defence δ
Input: Impact I of risk scenario
Input: Partial selection strategy x : Dp →{0, 1}
Output: true if δ is profitable, false otherwise
1: if x(δ) = 0 then
2:
    return true
3: else
4:
    ’ Extend x to all of D
5:
    x(δ′) ←0 for all δ′ ∈D \ Dp
6:
    x(δ) ←0
7:
    v0 ←ROSI(x)
8:
    x(δ) ←1
9:
    v1 ←ROSI(x)
10:
    ’ δ is profitable iffthe residual risk is lower when δ is implemented
11:
    if v1 · I + c(δ) < v0 · I then
12:
        return true
13:
    else
14:
        return false
15:
    end if
16: end if

该算法的输入包括防御措施 $\delt