[EpiData-list] encryption fields in EpiData

epidata-list at lists.umanitoba.ca epidata-list at lists.umanitoba.ca
Sat Nov 5 13:13:55 CDT 2011


I am implementing an application that has to import .REC files, including 
encryption fields. 
EpiData documentation says the encryption used is AES/Rijndael, and nothing 
more. That information is not sufficient, unfortunately.
Therefore I would like to ask:

(1) What is the keylength used?

(2) What is the cipher mode of operation used?

(3) If the cipher mode is ECB or CBC, what kind of padding is used?

(4) Is an initialization vector or salt used?
(I guess none, since EpiData creates the same encrypted text in the first line 
of the .REC file, whenever the same password is used).

Probably these questions should be answered by a technical person, i.e. 
EpiData developer.

Thank you in advance,

Theodore Lytras

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