Question

Why does Cryptex calculate an additional hash (using the MD5 algorithm) from the SHA hash and store the result in the file header?

a.

To use as a key for encrypting and decrypting the data

b.

To store the unique password identification

c.

To make it incredibly easy to decrypt Cryptex archives

d.

To detect whether the supplied password was correct or incorrect

Posted under Reverse Engineering

Answer: (b).To store the unique password identification Explanation:When an archive is opened, the supplied password is hashed twice (once using SHA and once using MD5), and the MD5 result is compared against the one stored in the archive header. If they match, the password is correct. Cryptex calculates an additional hash from the SHA value and stores that as the unique password identification.

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Q. Why does Cryptex calculate an additional hash (using the MD5 algorithm) from the SHA hash and store the result in the file header?

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