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AES-192-WRAP-PAD-INV ENCRYPTION TOOL

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The AES-192-WRAP-PAD-INV algorithm is a cryptographic method designed for secure key wrapping and unwrapping operations. It utilizes the Advanced Encryption Standard (AES) block cipher with a key size of 192 bits, providing a high level of security suitable for protecting sensitive cryptographic keys and small data blocks. The algorithm extends the AES key wrap specification by including padding and inversion steps, ensuring compatibility with variable-length inputs and enhancing resilience against certain attack vectors.

Core Components

The algorithm relies on several fundamental components:

  • AES-192 Cipher: Operates in ECB mode internally to provide block-level encryption and decryption.
  • Padding Mechanism: Ensures that input data fits into the required block size by appending bytes according to a defined padding scheme.
  • Inversion Step: Applied to enhance security by rearranging and reversing certain internal transformations.

Algorithm Steps

The AES-192-WRAP-PAD-INV process is divided into wrapping and unwrapping phases. Each phase is deterministic and reversible to allow secure recovery of the original data.

Wrapping Procedure

  1. Input key data is padded to a multiple of 64 bits using the specified padding method.
  2. The padded key is split into multiple 64-bit blocks.
  3. An initial value is combined with the first block to form the first intermediate block.
  4. Each block undergoes iterative AES-192 encryption, followed by XOR and rotation operations, producing wrapped blocks.
  5. The final wrapped output consists of all encrypted blocks concatenated together with the initial value.

Unwrapping Procedure

  1. The wrapped data is divided into the initial value and wrapped blocks.
  2. Blocks are decrypted using AES-192 in reverse order, applying XOR and rotation operations inversely.
  3. The inversion step is applied to reverse internal block transformations.
  4. Padded bytes are removed according to the padding scheme, restoring the original key data.

Security Considerations

The AES-192-WRAP-PAD-INV algorithm ensures confidentiality of wrapped keys, integrity of data through deterministic transformations, and resistance to padding oracle attacks. The use of AES-192 provides a balanced tradeoff between computational efficiency and cryptographic strength. Implementations must strictly follow block processing rules to avoid weakening the wrapping procedure.

Applications

This algorithm is typically employed in secure key management systems, hardware security modules, and environments where safe transmission of cryptographic keys is required. It is compatible with standardized AES key wrapping protocols and supports varying input lengths through its padding capability.

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