network profile
| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 9 months |
| seen | yesterday | |
| stats | profile views | 10 |
|
Oct 1 |
comment |
How could block encryption in counter mode be secure from viewpoint of entropy? I surmise that it seems anyway difficult to characterize a nice goal of design for stream encryptions, noting on the other hand that the perfect security of OTP is based on the concept of entropy. |
|
Oct 1 |
comment |
How could block encryption in counter mode be secure from viewpoint of entropy? But do you consider my figure of entropy correct? If so, what is the magnitude of entropy that a key stream bit would need to have in practice for a more or less secure stream encryption? |
|
Oct 1 |
asked | How could block encryption in counter mode be secure from viewpoint of entropy? |
|
Sep 22 |
comment |
Why is there a strong distinction between stream and block ciphers? @CodesInChaos. Sorry I missed to answer your main point. I was referring to Ebermann's sentence "A stream cipher usually translates the bits/bytes/... of the stream differently, depending ...". Doesn't that "differently" correspond to the notion of variablity? |
|
Sep 22 |
comment |
Why is there a strong distinction between stream and block ciphers? @CodesInChaos. Different applications have different performance requirements. To encrypt e.g. an email, one doesn't need the performance that would be desirable for encryption of, say, a video-file. |
|
Sep 22 |
comment |
Why is there a strong distinction between stream and block ciphers? If I don't err, "chaining" in block encryption is normally employed in the context of "block chaining", i.e. rendering the successive blocks dependent on one another so as to make the analysis more difficult. So IMHO ECB would have by definition no chaining effect as such. |
|
Sep 22 |
comment |
Why is there a strong distinction between stream and block ciphers? As to speed, different applications have different demands. To encrypt e.g. a normal email, 1 sec. is certainly not too much as to be inacceptable. Open source by itself is IMHO not sufficient to fully satisfy user's wishes. It would be desirable that he could without too much difficulties understand the design (at least to some degree intuitively, subjectively) and that the cipher would be good enough for his purposes. |
|
Sep 22 |
comment |
Why is there a strong distinction between stream and block ciphers? @PauloEbermann. IMHO you answered for me a question of CodesinChaos conscerning "dynamics and variability". |
|
Sep 22 |
comment |
Why is there a strong distinction between stream and block ciphers? I questioned whether it is necessary to have two different terms. According to what you explained, a stream cipher is simply a special case of a block cipher, i.e. one for the limiting case where the n in the set {0,1}^n is 1. So I would argue for not maintaining the current distinction of terminologies. |
|
Sep 22 |
asked | Why is there a strong distinction between stream and block ciphers? |
