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Identify the encryption algorithm by the description: Symmetric-key block cipher having a classical 12- or 16-round Feistel network with a block size of 64 bits for encryption, which includes large 8 × 32-bit S-boxes based on bent functions, modular addition and subtraction, key-dependent rotation, and XOR operations. This cipher also uses a "masking" key and a "rotation" key for performing its functions.