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May
18
comment What is the difference between online and offline brute force attacks?
Yes; but that's typically not the meaning of online in cryptography, as understood in online brute-force attack.
May
18
comment Does failure of indistinguishability of encryptions imply lack of CPA-security?
Yes, except for use of OTP as an example. Let's take the semantic step of considering that the OTP can be subjected to the test while still remaining worth of its name, despite the fact that a single key $k$ is drawn at step 1, and it is shorter than the total (or even individual) size of messages at 2 and 4. We have to admit that this OTP is used with the same pad at each use in 2 and 4 (with the pad a repetition of the key for longer messages). This OTP fails the test of indistinguishablity of encryptions under eavesdropping, and is thus not a proper example of the point discussed.
May
18
revised What is the difference between online and offline brute force attacks?
Add note
May
18
comment What is the difference between online and offline brute force attacks?
@Jingwei: OK for that description of offline brute force attacks; for online brute force attack, what's important is that the other entitie(s) is/are what is under attack. I'll add a note to clarify.
May
18
answered What is the difference between online and offline brute force attacks?
May
18
revised Is the HMAC construction really neccessary for a fixed length message?
Final polish
May
18
revised Is the HMAC construction really neccessary for a fixed length message?
remove considerations on the third construct, and ROM
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Fix intro
May
17
comment Is the HMAC construction really neccessary for a fixed length message?
@Anon2000: for your need of a fast MAC, have you considered Siphash?
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Polish, fix link
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Revised summary
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Polish
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Polish
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Give example where HMAC is better
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Third try
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Start with a summary
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Start with a summary
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
Expand
May
17
revised Is the HMAC construction really neccessary for a fixed length message?
deleted 982 characters in body
May
17
answered Is the HMAC construction really neccessary for a fixed length message?