Add encryption metadata documents

docs/Formats/encryption-metadata-format.md

@@ -0,0 +1,29 @@
+---
+title: Encryption Metadata Format
+layout: default
+parent: Formats
+---
+
+## Encryption Metadata Format
+
+The Encryption Metadata Format defines metadata related to encryption, including parameters used in key encapsulation and password-based key derivation.
+
+### EncryptionMetadataFormat
+
+- `encryption_algorithm`: Specifies the encryption algorithm used.
+- `nonce`: Nonce used in encryption for achieving probabilistic encryption.
+- `kem_metadata`: Metadata related to the Key Encapsulation Mechanism (KEM), including the KEM algorithm, Diffie-Hellman parameters, ciphertext, and salt.
+- `pkdf_metadata`: Metadata related to the Password-Based Key Derivation Function (PKDF), including the salt and algorithm.
+
+```
++---------------------+
+|   encryption_algorithm  |
+|   nonce               |
+|   kem_metadata        |
+|   pkdf_metadata       |
++---------------------+
+```
+
+[Key Encapsulation Mechanism Metadata Format](./kem-metadata-format)
+
+[Password-Based Key Derivation Function Metadata Format](./pkdf-metadata-format)

docs/Formats/kem-metadata-format.md

@@ -0,0 +1,29 @@
+---
+title: Key Encapsulation Mechanism Metadata Format
+layout: default
+parent: Encryption Metadata Format
+---
+
+## Key Encapsulation Mechanism Metadata Format
+
+The Key Encapsulation Mechanism (KEM) Metadata Format defines metadata related to the Key Encapsulation Mechanism used in encryption.
+
+### KEMMetadataFormat
+
+- `kem_algorithm`: Specifies the Key Encapsulation Mechanism (KEM) algorithm used.
+- `dh_algorithm`: Specifies the Diffie-Hellman algorithm used for key exchange.
+- `dh_sender_public_key`: Public key component used in Diffie-Hellman key exchange.
+- `hkdf_algorithm`: Specifies the Hash-based Key Derivation Function (HKDF) algorithm used.
+- `kem_ciphertext`: The ciphertext generated by the Key Encapsulation Mechanism.
+- `kem_salt`: Salt used in the Key Encapsulation Mechanism.
+
+```
++------------------------+
+|   kem_algorithm        |
+|   dh_algorithm         |
+|   dh_sender_public_key |
+|   hkdf_algorithm       |
+|   kem_ciphertext       |
+|   kem_salt             |
++------------------------+
+```

docs/Formats/pkdf-metadata-format.md

@@ -0,0 +1,21 @@
+---
+title: Password-Based Key Derivation Function Metadata Format
+layout: default
+parent: Encryption Metadata Format
+---
+
+## Password-Based Key Derivation Function Metadata Format
+
+The Password-Based Key Derivation Function (PKDF) Metadata Format defines metadata related to the Password-Based Key Derivation Function used in encryption.
+
+### PKDFMetadataFormat
+
+- `pkdf_salt`: Salt used in the Password-Based Key Derivation Function (PKDF).
+- `pkdf_algorithm`: Specifies the Password-Based Key Derivation Function (PKDF) algorithm used.
+
+```
++----------------------+
+|   pkdf_salt          |
+|   pkdf_algorithm     |
++----------------------+
+```