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4

In a better world, TLS_FALLBACK_SCSV would not be necessary: SSL has been supporting downgrade-proof version negotiation since at least SSL 3.0, so a man in the middle should never be able to limit a connection to a version older than the mutually supported maximum. However, out there are some broken servers that don't really support that kind of version ...


8

Is it true the longer the key length is the more secure the encryption? No. Key length does put a lower bound on security, because it determines the complexity of brute force iteration of the key space or factoring, discrete log, etc. for some asymmetric algorithms. However, once you have a long enough key to make brute force attacks impossible, there ...


3

Like all things in life, there are tradeoffs to be balanced. SSL can use RSA keys, right? So why not generate 2 billion bit RSA keys? Well, the efficiency of RSA goes down significantly as more bits are added. With too large of keys, RSA would be impractical to use in real life. Another answer to your question is that 5000-bit AES does not exist. We are ...


1

Not in general, no. For example, under certain kinds of attacks AES-256 is actually easier to break than AES-128. There are many, many factors that can affect the security of an encryption scheme; key length is only one of them.


0

Basically you are talking about “superencipherment”. This has a long history in cyptography, but it eats up space like crazy. Your observation of PK cyptography being vulnerable is true. Solving 'Prime' would bring the house down.


2

They rely on problems not so different as you might think. They are based either in the factoring problem or in the discrete logarithm problem, which have a deep connection between each other. Once you have an algorithm that can efficiently solve one, you most likely would be able to adapt it to reproduce an answer for the other in polynomial time. Thus ...


6

I don't know about computing things in parallel, so I will ignore that part of the question. First, please note that the encryption algorithm is rarely the the weak point of the security. It is far more likely that you will have problems with the implementation, some spyware installed on your computer, a weak password (If you use qwerty as your password, ...



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