Changes between Version 1 and Version 2 of security/electronic_signatures


Ignore:
Timestamp:
Feb 28, 2013, 4:29:23 PM (11 years ago)
Author:
Sam Habiel
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • security/electronic_signatures

    v1 v2  
    99Various parts of FOIA VISTA accomplish this using the encryption and decryption functionality. The encryption algorithm used is a stream cipher (I am not exactly sure which one). For TIU documents, the cipher algorithm uses the document's checksum of document contents as one of the vectors in the algorithm to encrypt the signer's name and title. If the document is modified outside of TIU, the user will see gibberish for these two fields.
    1010
     11For example, this is a typical signature:
     12{{{
     13/es/ DOCTOR MCDUCK, MD
     14ENT PHYSICIAN
     15Signed: 02/27/2013 09:34
     16}}}
     17
     18If the document is changed outside of TIU, it may look like this (this example isn't real as I do not have access to the algorithm):
     19{{{
     20/es/ lks&*(*% *(*&@#$*&
     21A#@^*(ssDASDF
     22Signed: 02/27/2013 09:34
     23}}}
     24
     25Other VISTA packages, notably Radiology, implement the same functionality, using other vectors for encryption.
     26