On 2008-Apr-30, at 11:47, Joachim Schneider wrote: .Q: " In the formula: Cq ← 1 XTS-AES-blockEnc(Key, Pj, i, q) Pj can be replaced by Pq, correct?" A: I think you're right. Any C(q) would be derived from a P(q) and the tweak. I think j is a typo and should be replaced with q as j is a loop invariant. Same goes for the decryption formula on page 7.
Do we need to amend the published draft to fix this typo? If we do, then some additional explanatory text around this question:
Q: "-In line 30 and 31 page 3 there is statement says that the size of a data-unit is 2^128-2 128 bit block. On the next sentence it says that the size of the data-unit is 2^20 128 bit block. This seems to be a contradiction." A: I think the key is in the words preceding the numbers - namely "shall not" (meaning may not without grave consequences) and "should not" which isn't quite as restrictive. No contradiction there
should be added as I have seen that same question raised by more than one person.
chongo () /\oo/\
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