OK, the header now looks like this:
----------------------------------------------------
struct Entangle_Header {
char salt[64];
............. /*More if needed*/
/* ----- Format ----- */
uint16_t prog_version; /* Header format version */
uint64_t file_size; /* size of original file */
byte keys[32]; /* AES-256 key storage area */
............. /*More data for GCM if needed*/
}
----------------------------------------------------
And what about encrypting the header with AES-128/GCM and the very file with
AES-256/GCM? That seems to be quite secure for the file and simple for the user
(16 char key).
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