The Call of the Open Sidewalk

From a place slightly to the side of the more popular path

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pgpfan:ocfb

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pgpfan:ocfb [2022/05/20 23:41] – created b.walzerpgpfan:ocfb [2022/12/27 22:45] – More truth. b.walzer
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-The "Unique Value" here is a value (usually just random) that makes the message unique, even if you have encrypted the same message in the past. The fact that you are sending the same or similar messages is a type of information leak.+The "Unique Value" here is a value (usually just random) that makes the message unique, even if you have encrypted the same message in the past encrypted with the same key. The fact that you are sending the same or similar messages is a type of information leak.
  
 The problem here is that the unique value is required to decrypt the message. So it has to be passed along with the message and can't be encrypted. So an attacker knows what it is and can change it to whatever they want. This allows them to, say, quietly chop off the start of the message without penalty. The problem here is that the unique value is required to decrypt the message. So it has to be passed along with the message and can't be encrypted. So an attacker knows what it is and can change it to whatever they want. This allows them to, say, quietly chop off the start of the message without penalty.
  
-This is (again roughly) how OpenPGP starts up cipher feedback:+This is (roughly) how OpenPGP starts up cipher feedback:
  
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pgpfan/ocfb.txt · Last modified: 2022/12/27 22:56 by b.walzer