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@startuml
'left to right direction
' scale elements so that latex becomes proportionally smaller
skinparam CardFontSize 25
skinparam ArrowThickness 2
' rectangular shaped arrow lines
skinparam linetype ortho
card Donor as donor
card Charity as charity
card Donau as donau
donor "<latex>$\text{ 1. }\vec\mu,$\\$\text{ donation money}$</latex>" -> charity
charity "<latex>$\text{2. }\sigma_c\text{ }$$</latex>" -> donau
donau --> charity : <latex>$\text{3. }\overline\beta_1, ..., \overline\beta_n$</latex>
charity --> donor : <latex>$\text{4. }\overline\beta_1, ..., \overline\beta_n$</latex>
note as leg #white
<latex>$\vec{u} = \text{blinded unique donor identifiers}$</latex>
<latex>$\mu = \langle \overline{u}, H(K^{pub}_x) \rangle$</latex>
<latex>$\sigma_c = \text{sign(\vec{\mu}, C^{priv})}$</latex>
<latex>$\overline{\beta} = \text{blind signature}$</latex>
end note
@enduml
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