Connecting Security Requirements Analysis and Secure Design Using Patterns and UMLsec - Advanced Information Systems Engineering - page 373

Fig. 2. Structural View of GSA for “CSPF Confidential Data Transmission Using
Cryptographic Key-Based Symmetric Encryption”

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Fig. 3. Behavioral View Complementing Fig. 2

example a GSA for the machine domain of the CSPF confidential data trans-
mission using cryptographic key-based symmetric encryption. Figure 2 shows
the structural view of the GSA using a composite structure diagram. The Sender
machine domain loads the Sent data and Cryptographic key 1 domains from a storage
device. Hence, we introduce the GNC StorageManager to access a storage device.
The Sent data domain is encrypted using the Cryptographic key 1 domain. For this
reason, we introduce the GSC SymmetricEncryptorDecryptor presented in Sect. 3.2.
Furthermore, the Sender machine domain sends the encrypted data to the Com-
munication medium domain. Hence, we introduce the GNC CommunicationManager
to access a network.
AccordingtotheCSPFthisGSAis related to, the plaintext pt represented in
the CSPF as lexical domain Sent data should be kept confidential. Hence, the GSC
SymmetricEncryptorDecryptor and the GNC Application that makes use of this GSC