We present a new K-band survey covering 623 arcmin 2 in the VVDS 0226-0430 deep field down to a limiting magnitude KVega 20.5. We use the spectroscopic sample extracted from this new K-band catalogue to assess the effectiveness of optical-near infrared color selections in identifying extreme classes of objects at high redshift. 1. The VVDS F02 K-selected sample Near-infrared (NIR) selected samp...

We present new protocols for conditional disclosure of secrets (CDS), where two parties want to disclose a secret to a third party if and only if their respective inputs satisfy some predicate. • For general predicates P : [N ]×[N ] → {0,1}, we present two protocols that achieve o(N 1/2) communication: the first achieves O(N 1/3) communication and the second achieves sub-polynomial 2O( p log N ...

We present an analysis of the Far Ultraviolet Spectroscopic Explorer (FUSE) and the Space Telescope Imaging Spectrograph (STIS E140M) spectra of HE0226–4110 (zem = 0.495) that have a nearly continuous wavelength coverage from 910 to 1730 Å. We detect 56 Lyman absorbers and 5 O VI absorbers. The number of intervening O VI systems per unit redshift with Wλ & 50 mÅ is dN (O VI)/dz ≈ 11. For 4 of t...

In this paper we describe in detail the reduction, preparation and reliability of the photometric catalogues which comprise the CFH12K-VIRMOS deep field. This region, consisting of four contiguous pointings of the CFH12K wide-field mosaic camera, covers a total area of 1.2 deg. The survey reaches a limiting magnitude of BAB ∼ 26.5, VAB ∼ 26.2, RAB ∼ 25.9 and IAB ∼ 25.0 (corresponding to the poi...