In this paper, we use linear approximations of the addition modulo 2 of three n-bit integers to identify linear approximations of g1, g2, the feedback functions of HC-128. This, in turn, shows that the process of keystream output generation of HC-128 can be well approximated by linear functions. In this direction, we show that the “least significant bit” based distinguisher (presented by the de...

introduction: head circumference (hc) measurement is one of the important parameter for diagnosis of neurological, developmental disorders and dysmorphic syndromes. recognition of different disorders requires an understanding of normal variation for hc size, in particular, in infancy period with most rapid growth of the brain. because of international and interracial standard chart differences ...

Statement 1. HC-128 supports 128-bit key and 128-bit initialization vector. Statement 2. 2 keystream bits can be generated from each key/IV pair. Statement 3. There is no hidden flaw in HC-128. Statement 4. The smallest period is expected to be much larger than 2. Statement 5. Recovering the secret key is as difficult as exhaustive key search. Statement 6. Distinguishing attack requires more th...

HC-128 is an eSTREAM final portfolio stream cipher. Several authors have investigated its security and, in particular, distinguishing attacks have been considered. Still, no one has been able to provide a distinguisher stronger than the one presented by Wu in the original HC128 paper. In this paper we first argue that the keystream requirement in Wu’s original attack is underestimated by a fact...

Ten mg hydrocortisone (HC) was administered intravenously to a healthy volunteer after a dexamethasone suppression test and HC concentrations were determined from 1-270 min in plasma, plasma water and on erythrocytes. HC was extracted from erythrocyte concentrates with high efficiency by HC-poor plasma or by human or bovine albumin solutions. Determination of HC in the plasma of the volunteer m...

If A is an admissible set, let HC(A) = {x I x E A and x is hereditarily countable in A}. Then HC(A) is admissible. Corollaries are drawn characterizing the "real parts" of admissible sets and the analytical consequences of admissible set theory. ?1. A transitive set A is admissible if it satisfies pairing, set union, J0-separation and J0-bounding (Platek [7], Barwise [1]). An easy theorem of ZF...