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PerryTachett



Joined: 08 Jun 2008
Posts: 5
PerryTachett
A one-time pad is unbreakable.
Many cyphers are unbreakable when entropy of key > entropy of plaintext.
It doesn't take any fancy garbage to make something completely unbreakable even with infinite resources.
Example one-time pad:
Key is random 512 bits.
Plaintext is random 512 bits.
Cyphertext is Key xor Plaintext.

S(A xor B) is greater than or equal to both S(A), and S(B), where S(A) = entropy of A.
If S(Key) = 512 bits, therefor is totally random, the resultant entropy is 512 bits. This gives an attacker no information about the plaintext.
Post 08 Jun 2008, 20:00
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17716
Location: In your JS exploiting you and your system
revolution
PerryTachett wrote:
A one-time pad is unbreakable.
Many cyphers are unbreakable when entropy of key > entropy of plaintext.
It doesn't take any fancy garbage to make something completely unbreakable even with infinite resources.
Example one-time pad:
Key is random 512 bits.
Plaintext is random 512 bits.
Cyphertext is Key xor Plaintext.

S(A xor B) is greater than or equal to both S(A), and S(B), where S(A) = entropy of A.
If S(Key) = 512 bits, therefor is totally random, the resultant entropy is 512 bits. This gives an attacker no information about the plaintext.
Sure, but the problem still remains how to securely transport the key to the end destination. That is why, up till now, one-time-pads have not been implemented in practical systems. This may change with quantum cryptography key distribution in the future.
Post 08 Jun 2008, 20:14
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PerryTachett



Joined: 08 Jun 2008
Posts: 5
PerryTachett
Oh, yes, I know.
However, I was specifically responding to vid:

Quote:

Quote:
it can be cracked, matter of time.


every encryption with can be cracked if you have enough time Laughing
Post 08 Jun 2008, 20:49
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AlexP



Joined: 14 Nov 2007
Posts: 561
Location: Out the window. Yes, that one.
AlexP
Quote:
That is why, up till now, one-time-pads have not been implemented in practical systems
Wasn't there some sort of White House -> Moscow hot line that used OTP? Hmm... Break OTP and we learn all of the Cold War conspiracies!!!!!
Post 09 Jun 2008, 12:53
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