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POWhich procedure is more secure for encryption using Password and Seed
 

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  1. POWhich procedure is more secure for encryption using Password and Seed
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    <p>I am designing a procedure and file format for the encryption application. I came to a point when I need to make a decision regarding the method/workflow of the encryption. I can't make up my mind on pros vs cons of using one approach over another.</p> <p>Below is an overview of the format structure:</p> <pre> ------------------------------------------ | File signature || fixed | plain | |----------------||----------|-----------| | Algorithm info || fixed | plain | |----------------||----------|-----------| | Seed || fixed | encrypted | |----------------||----------|-----------| | Data || variable | encrypted | |----------------||----------|-----------| | CRC || fixed | encrypted | ------------------------------------------ </pre> <p>Initially, I am going to use <strong>SHA-256</strong> for a Hash function and <strong>AES-256</strong> for an Encryption algorithm, but later it will be configurable, as the format suggests.</p> <p>Proposed procedure for creating encrypted container:</p> <ol> <li>Hash(Password) => Key-Pass</li> <li>Generate random Seed</li> <li>Key-Pass XOR Seed => Key-Seeded</li> <li>Encrypt Seed with Key-Pass and store encrypted Seed</li> <li>Encrypt Data with Key-Seeded and store encrypted Data</li> <li>Encrypt CRC with Key-Seeded and store encrypted CRC</li> </ol> <h3>Questions</h3> <p><strong>A.</strong> Do I gain anything from storing encrypted Seed and CRC? Would it be less secure if I store them not encrypted?</p> <p><strong>B.</strong> Is it more or less or no difference in security of using [ Hash(Password + Seed) ] for key generation rather than prosed [ Hash(Password) XOR Seed ] for the final key?</p> <p><strong>C.</strong> A concluding question from two questions above. Would it be better or worse to use the alternative procedure for creating encrypted container:</p> <ol> <li>Hash(Password + Seed) => Key</li> <li>Store unencrypted Seed</li> <li>Encrypt Data with Key and store encrypted Data</li> <li>Store unencrypted CRC (or encrypted)</li> </ol> <p>I guess I would have to store unencrypted Seed in order to regenerate Key on reading back the encrypted content. CRC can be either encrypted or unencrypted.</p>
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