Encryption system for time division multiplexed networks
First Claim
1. An encryption system for interfacing with a time division multiplexing (TDM) telecommunications arrangement, said encryption system providing encryption of data received by said telecommunications arrangement and the telecommunications arrangement producing an in-band TDM data stream formatted into TEM frames including a predetermined number of individual in-band TDM framing bits located at corresponding individual original in-band framing bit locations, said encryption system including a local side comprising:
- means for receiving from said telecommunications arrangement a first in-band TDM data stream to be encrypted;
means for removing each of said individual in-band TDM framing bits from the received in-band TDM data stream;
means for encrypting said received in-band TDM data stream after said framing bits are removed to produce an encrypted data stream; and
means for reinserting each of said individual in-band TDM framing bits into a said corresponding individual original framing bit location in said encrypted TDM data stream to produce an encrypted data stream with reinserted in-band TDM framing bits; and
said system further including a remote side comprising;
means for receiving said encrypted data stream with inserted in-band TDM framing bits, for removing said in-band TDM framing bits therefrom, and for decrypting the received encrypted data stream to produce a second TDM data stream; and
means for reinserting said in-band TDM framing bits into said second TDM data stream at said corresponding original framing bit locations so as to produce a third in-band TDM data stream that corresponds to said first in-band TDM data stream.
0 Assignments
0 Petitions
Accused Products
Abstract
An encryption system is provided for interfacing a time division multiplexing (TDM) telecommunications arrangement with an encryption device for the scrambling of data received by the telecommunications arrangement. The telecommunications arrangement produces a TDM data stream formatted into TDM frames including a predetermined number of TDM framing bits and corresponding framing bit locations. At a local side of the system, a first TDM data stream is received and sampled, and the TDM framing bit information is detected and stored therefrom. The data stream is then sent to an encryptor for encryption, and thereafter the TDM framing bit information is reinserted into the corresponding bit locations of the encrypted data stream. As a result, the TDM framing bit information is passed around the encryptor. This encrypted data stream and framing bit information is transmitted to a remote station across a TDM (e.g., T1) communications network. At the remote station, the TDM framing bit information is again detected and stored, the encrypted data stream is decrypted, and the TDM framing bit information is reinserted to the corresponding locations.
29 Citations
16 Claims
-
1. An encryption system for interfacing with a time division multiplexing (TDM) telecommunications arrangement, said encryption system providing encryption of data received by said telecommunications arrangement and the telecommunications arrangement producing an in-band TDM data stream formatted into TEM frames including a predetermined number of individual in-band TDM framing bits located at corresponding individual original in-band framing bit locations, said encryption system including a local side comprising:
-
means for receiving from said telecommunications arrangement a first in-band TDM data stream to be encrypted; means for removing each of said individual in-band TDM framing bits from the received in-band TDM data stream; means for encrypting said received in-band TDM data stream after said framing bits are removed to produce an encrypted data stream; and means for reinserting each of said individual in-band TDM framing bits into a said corresponding individual original framing bit location in said encrypted TDM data stream to produce an encrypted data stream with reinserted in-band TDM framing bits; and said system further including a remote side comprising; means for receiving said encrypted data stream with inserted in-band TDM framing bits, for removing said in-band TDM framing bits therefrom, and for decrypting the received encrypted data stream to produce a second TDM data stream; and
means for reinserting said in-band TDM framing bits into said second TDM data stream at said corresponding original framing bit locations so as to produce a third in-band TDM data stream that corresponds to said first in-band TDM data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. In a time division multiplexing (TDM) telecommunications system which produces an in-band TDM data stream formatted into TDM frames including a predetermined number of individual in-band TDM framing bits located at corresponding individual original framing bit locations, an encryption system comprising first and second encryption units interconnected by a telecommunications network of said telecommunications system, said encryption units comprising:
-
means for receiving a first in-band TDM data stream to be encrypted; means for removing each of said individual in-band TDM framing bits from the received in-band TDM data stream; means for encrypting said received in-band TDM data stream after said framing bits have been detected and stored to produce an encrypted data stream; and means for inserting each of said individual in-band TDm framing bits into a said individual corresponding original framing bit location in said encrypted TDM data stream to produce an encrypted data stream with inserted in-band TDM framing bits for transmission to said second unit; and means for receiving an encrypted data stream with inserted in-band TDM framing bits from said second unit, for detecting and storing each of said individual in-band TDM framing bits therefrom, and for decrypting said encrypted data stream to produce a second TDM data stream; and
means for reinserting each of said individual in-band TDM framing bits into said second TDM data stream at said corresponding original framing bit locations so as to produce a third in-band TDM data stream that corresponds to said first in-band TDM data stream encrypted by said second unit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
-
Specification