Changes between Version 1 and Version 2 of security/electronic_signatures

Timestamp:

Feb 28, 2013, 4:29:23 PM (12 years ago)

Author:

Sam Habiel

Comment:

--

security/electronic_signatures

@@ -9 +9 @@
 Various 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.
 
+For example, this is a typical signature:
+{{{
+/es/ DOCTOR MCDUCK, MD
+ENT PHYSICIAN
+Signed: 02/27/2013 09:34
+}}}
+
+If 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):
+{{{
+/es/ lks&*(*% *(*&@#$*&
+A#@^*(ssDASDF
+Signed: 02/27/2013 09:34
+}}}
+
+Other VISTA packages, notably Radiology, implement the same functionality, using other vectors for encryption.
+