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POEncryption with AES-256 and the Initialization Vector
 

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    <p>I have a question relating to the use of an Initialization Vector in AES encryption. I am referencing the following articles / posts to build encryption into my program: </p> <p>[1] <a href="https://stackoverflow.com/questions/992019/java-256bit-aes-encryption">Java 256-bit AES Password-Based Encryption</a><br> [2] <a href="http://gmailassistant.sourceforge.net/src/org/freeshell/zs/common/Encryptor.java.html" rel="nofollow noreferrer">http://gmailassistant.sourceforge.net/src/org/freeshell/zs/common/Encryptor.java.html</a></p> <p>I was originally following erickson's solution from the first link but, from what I can tell, PBKDF2WithHmacSHA1 is not supported on my implementation. So, I turned to the second link to get an idea for my own iterative SHA-256 hash creation. </p> <p>My question comes in how the IV is created. One implementation ([1]) uses methods from the Cypher class to derive the IV where are the other ([2]) uses the second 16 bytes of the hash as the IV. Quite simply, why the difference and which is better from a security standpoint? I am kinda confused to the derivation and use of IVs as well (I understand what they are used for, just not the subtler differences), so any clarification is also very welcome.</p> <p>I noticed that the second link uses AES-128 rather than AES-256 which would suggest to me that I would have to go up to SHA-512 is I wanted to use this method. This seems like it would be an unfortunate requirement as the user's password would have to be 16 characters longer to ensure a remotely secure hash and this app is destined for a cell phone.</p> <p>Source is available on request, though it is still incomplete.</p> <p>Thank you in advance.</p>
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    1. COIt is worth to take a loot at http://stackoverflow.com/questions/14937707/getting-incorrect-decryption-value-using-aescryptoserviceprovider/. It says about setting the `IV` during encryption.
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