Jonathan Leffler

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146 reputation
4
bio website None
location United States
age 53
visits member for 3 years, 9 months
seen Jul 10 at 23:32
Long-time Informix user and developer, experienced in C and Unix (many variants). Email: jonathan.leffler@gmail.com

Apr
10
comment What was so dangerous about PGP that its creator was charged in court for it?
As I read it, the article describes a case of espionage, but does not describe a Russian-backed bank or other company taking over a Silicon Valley company.
Apr
8
comment What was so dangerous about PGP that its creator was charged in court for it?
Can you provide any sort of evidence to back up your claims about the USSR acquiring Silicon Valley startups?
Jan
30
revised Encryption and Deniability
decrytp -> decrypt
Jan
29
comment Encryption and Deniability
Because Alice wants to be able to deny knowing K. If she did as you suggested, she would have to know K, so she could not deny knowing what is in the message. As shown, she can claim that Mallory sent her K', H and M' (but she can claim that she does not know K or M). If done as you suggest, she could not plausibly claim not to know K and hence M.
Jan
29
awarded  Teacher
Jan
29
comment Encryption and Deniability
I think Bob can prove that Alice knows K, and Bob knows that M was encrypted with K to generate M', and therefore Bob can show that Alice could have decrypted M' to get M, so for all practical purposes, Alice knew what was in M (or should have done) and she sent it to Bob.
Jan
29
answered Encryption and Deniability
Jan
29
comment Encryption and Deniability
Given the step P = ras_encrypt(Bob's public key, K + S), there isn't really a way for Alice to deny that she knew K, and therefore knew the content of M', and therefore she can't plausibly deny that she sent the message M to Bob. Some other person who does know K could create H, and Alice could have been duped into creating S from H. However, the step that generates P requires Alice to know K, so she can't plausibly deny being able to read M', which for all practical purposes means she knows what was in M and therefore sent M to Bob (and he has proof that she did).
Jun
3
awarded  Editor
Jan
19
comment What is the vulnerability in my PHP code?
This question is also on the main StackOverflow site.
Dec
22
awarded  Supporter
Dec
22
awarded  Autobiographer