@startuml
file plaintext [
    Platte tekst

    <size:40><&envelope-open></size>
]
file ciphertext [
    Versleutelde tekst

    <size:40><&envelope-closed></size>
]
file plaintext2 [
    Platte tekst

    <size:40><&envelope-open></size>
]
plaintext -ri-> ciphertext: <size:20><&key></size> Sleutel A
ciphertext -ri-> plaintext2: <size:20><&key></size> Sleutel B
@enduml
