Abstract: Apparatus for singulating paper sheets. The apparatus includes: a deck for supporting a plurality of paper sheets; a device for feeding the plurality of paper sheets along the deck; a retarding roller situated above the deck for retarding the plurality of paper sheets; and a feeding roller situated below the retarding roller for feeding the lowermost of the paper sheets past the retarding roller, which has a metal sleeve with a grit coating having a hardness on the Rockwell "C" scale of at least 60 and a grit size according to the U.S. Standard System between 10 and 320.

Abstract: Apparatus for apprising an unattended station of the presence of a voice message awaiting retrieval from a voice mail system. The voice mail system is connected to the unattended station, as by automatic telephone dialing, whereupon activating signals are transmitted to the unattended station to dispose that station in a signal receiving mode of operation. Display data then are transmitted to the unattended station when said unattended station is conditioned to receive signals. A disconnect operation is carried out to disconnect the voice mail system from the unattended station if the unattended station is not conditioned to receive signals, or subsequent to the transmission of the display data. Preferably, and in accordance with the preferred embodiment, the voice message is transmitted for recording at the unattended station if the display data are received successfully thereat.

Abstract: A method and apparatus for generating cryptographic keys for a postal manifest and for synchronizing cryptographic keys for transmitting postal data securely on a communication link is presented. The techniques for generating a key and for synchronizing keys use the same apparatus but use slightly different data to create a cryptographic key.The postal data center maintains a unique set of data for each server station. Using this set of data along with a manifest sequence number (or communication transaction number) and the date, a cryptographic key is created. Each server station stores a fixed master key, KO, a permutation table, Pt, and ID, and GMT date. Using the manifest sequence number (or the communication transaction number) a row of the permutation table is altered and the master key KO is scrambled with the permutation table top get a new key K2. With K2, the date, server ID, and manifest sequence number (our communication transaction number) are encrypted.