Dual Key Speech Encryption Algorithm Based Underdetermined BSS

Figure 2

(a) The original speech signals and two segments 𝑠₁(𝑡), 𝑠₂(𝑡); (b) two segments of key signals I 𝑘₁(𝑡), 𝑘₂(𝑡); (c) two segments of key signals II ℎ₁(𝑡), ℎ₂(𝑡); (d) two encrypted segments 𝑥₁(𝑡), 𝑥₂(𝑡); (e) two recovered segments by approximate calculation 𝑠₁̂(𝑡), 𝑠₂̂(𝑡).

(a)

(b)

(c)

(d)

(e)