| 摘要 |
An apparatus and method obtains cipher block chaining mode (CBC) ciphertext blocks that were encrypted using a cipher block chaining encryption method, such a audio or video, and decrypts the CBC ciphertext blocks that were encrypted using the cipher block chaining encryption method using a multistage counter mode (CTR) decryptor to produce blocks of plaintext data from the CBC ciphertext blocks. In one example, cipher block chaining mode (CBC) information is translated (e.g., rearranged) to random counter mode (CTR) information so that a multistage counter mode (CTR) decryptor decrypts CBC ciphertext blocks into corresponding decrypted CBC plaintext blocks, in a parallel fashion, based on the translated CBC information. As such, apparatus with CTR hardware can be used to decrypt CBC or CFB ciphertext blocks.
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