selective-encrypted-transmission-pattern

name	selective-encrypted-transmission-pattern
description	Security pattern for encrypting specific data before transmission. Use when only certain data elements need encryption, implementing field-level encryption for transit, or when entities must actively manage encryption decisions. Addresses "Leak action request or data in transit" problem.

Selective Encrypted Transmission Security Pattern

Entities actively encrypt specific sensitive data elements before transmitting them over uncontrolled channels. Entities directly interact with cryptographic libraries to encrypt only necessary parts.

Problem Addressed

Leak action request or data in transit: Sensitive data exposed while being transmitted over a channel that may be observed by unauthorized parties.

Core Components

Role	Type	Responsibility
Sender	Entity	Encrypts and transmits data
Receiver	Entity	Receives and decrypts data
CryptographerS	Cryptographic Primitive	Encryption library for Sender
CryptographerR	Cryptographic Primitive	Decryption library for Receiver

Data Elements

• d: Plaintext data element
• {d}_k: Ciphertext (d encrypted with key k)
• keyInfoS: Key information for encryption
• keyInfoR: Key information for decryption
• configS/configR: Cipher configuration

Pattern Flow

Sender → [encrypt(d, keyInfoS, configS)] → CryptographerS
CryptographerS → [{d}_k] → Sender
Sender → [{d}_k] → Receiver (over channel)
Receiver → [decrypt({d}_k, keyInfoR, configR)] → CryptographerR
CryptographerR → [d] → Receiver