US5432850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for secure data transmission
Assignee: Lannet Data Communications Ltd
•
Filing: 1993-06-30
•
Granted: 1995-07-11
•
Expires: 2013-06-30
Abstract
Abstract A method for secure transmission of data having a destination address and a source address on a shared communication network comprising the steps of transmitting a multiplicity of data frames, each containing at least an encrypted data sequence employing the destination address as at least part of a decryption key therefor, receiving the multiplicity of data frames at a receiver on the shared communication network and attempting to decrypt the encrypted data sequence by employing the local address of the receiver as at least part of a decryption key.
Inventors
- 👤 Michael Rothenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:15
CPC Classifications
H; H04; H04L; H04L63/00; H04L63/04; H04L63/0428; H04L63/0435; H04L9/00; H04L9/40
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
101 words
A method for secure transmission of data having a destination address and a source address on a shared communication network comprising the steps of: transmitting a multiplicity of data frames, each containing at least an encrypted data sequence, said multiplicity of data frames also containing an address check sequence; receiving the multiplicity of data frames at a receiver on the shared communication network; employing the address check sequence and the source address to verify that the local address of the receiver is identical to the destination address; and performing a decryption operation on the encrypted data sequence of verified data frames.
Claim 2
Independent Claim
101 words
A method for secure transmission of data having a destination address and a source address on a shared communication network comprising the steps of: transmitting a multiplicity of data frames, each containing at least an encrypted data sequence, said multiplicity of data frames also containing an address check sequence; receiving the multiplicity of data frames at a receiver on the shared communication network; employing the address check sequence and the source address to verify that the local address of the receiver is identical to the destination address; and performing a decryption operation on the encrypted data sequence of verified data frames.
Claim 3
Dependent Claim
35 words
A method according to claim 1 and including the step of preventing the receiver from receiving the transmission upon failure to verify that the local address of the receiver is identical to the destination address.
Claim 4
Dependent Claim
51 words
A method according to claim 2 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the step of performing a decryption operation utilizes the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 5
Dependent Claim
66 words
A method according to claim 2 wherein said multiplicity of data frames each also contains an encrypted source address sequence employing the destination address as at least part of a decryption key, and wherein the step of performing a decryption operation also comprises the step of: employing the local address of the receiver as part of a decryption key to decrypt the encrypted source address sequence.
Claim 6
Independent Claim
36 words
A method according to claims 4 and wherein the step of performing a decryption operation also comprising the step of: employing the decrypted source address as part of a decryption key to decrypt the data sequence.
Claim 7
Dependent Claim
51 words
A method according to claim 5 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the step of performing a decryption operation utilizes the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 8
Dependent Claim
51 words
A method according to claim 4 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the step of performing a decryption operation utilizes the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 9
Dependent Claim
66 words
A method according to claim 1 wherein said multiplicity of data frames each also contains an encrypted source address sequence employing the destination address as at least part of a decryption key, and wherein the step of performing a decryption operation also comprises the step of: employing the local address of the receiver as part of a decryption key to decrypt the encrypted source address sequence.
Claim 10
Dependent Claim
36 words
A method according to claim 8 and wherein the step of performing a decryption operation also comprising the step of: employing the decrypted source address as part of a decryption key to decrypt the data sequence.
Claim 11
Dependent Claim
51 words
A method according to claim 9 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the step of performing a decryption operation utilizes the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 12
Dependent Claim
51 words
A method according to claim 8 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the step of performing a decryption operation utilizes the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 13
Dependent Claim
51 words
A method according to claim 1 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the step of performing a decryption operation utilizes the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 14
Dependent Claim
113 words
Apparatus for secure transmission of data having a destination address and a source address on a shared communication network comprising: a transmitter which transmits a multiplicity of data frames, each containing at least an encrypted data sequence, said multiplicity of data frames also containing an address check sequence; a verifier which receives the encrypted data sequence and employs the address check sequence and the source address to verify that the local address of the receiver is identical to the destination address; a decrypter, which receives the verified data frames and performs a decryption operation thereon; and a receiver, which receives said multiplicity of data frames on said shared communication network after decryption thereof.
Claim 15
Dependent Claim
113 words
Apparatus for secure transmission of data having a destination address and a source address on a shared communication network comprising: a transmitter which transmits a multiplicity of data frames, each containing at least an encrypted data sequence, said multiplicity of data frames also containing an address check sequence; a verifier which receives the encrypted data sequence and employs the address check sequence and the source address to verify that the local address of the receiver is identical to the destination address; a decrypter, which receives the verified data frames and performs a decryption operation thereon; and a receiver, which receives said multiplicity of data frames on said shared communication network after decryption thereof.
Claim 16
Dependent Claim
33 words
Apparatus according to claim 13 and wherein said decrypter prevents the receiver from receiving the transmission upon failure to verify that the local address of the receiver is identical to the destination address.
Claim 17
Dependent Claim
50 words
Apparatus according to claim 14 and wherein said multiplicity of data frames each also contains an encrypted source address sequence employing the destination address as at least part of a decryption key, and wherein said decrypter employs the local address of the receiver to decrypt the encrypted source address sequence.
Claim 18
Dependent Claim
25 words
Apparatus according to claim 15 wherein the decrypter also employs the decrypted source address as part of a decryption key to decrypt the data sequence.
Claim 19
Dependent Claim
45 words
Apparatus according to claim 16 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the decrypter employs the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 20
Dependent Claim
45 words
Apparatus, according to claim 15 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the decrypter employs the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 21
Dependent Claim
45 words
Apparatus according to claim 14 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the decrypter employs the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 22
Dependent Claim
50 words
Apparatus according to claim 13 and wherein said multiplicity of data frames each also contains an encrypted source address sequence employing the destination address as at least part of a decryption key, and wherein said decrypter employs the local address of the receiver to decrypt the encrypted source address sequence.
Claim 23
Dependent Claim
25 words
Apparatus according to claim 20 wherein the decrypter also employs the decrypted source address as part of a decryption key to decrypt the data sequence.
Claim 24
Dependent Claim
45 words
Apparatus according to claim 21 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the decrypter employs the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 25
Dependent Claim
45 words
Apparatus according to claim 20 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the decrypter employs the local address of the receiver as at least part of a decryption key for decryption purposes.
Claim 26
Dependent Claim
45 words
Apparatus according to claim 13 wherein said encrypted data sequence also employs the destination address as at least part of the key therefor and wherein the decrypter employs the local address of the receiver as at least part of a decryption key for decryption purposes.
References Cited (Backward Citations)
US4418425A
Cited
US4860352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-10 | 1999-01-09 | 1999-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-10 | 2003-01-09 | 2003-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-10 | 2007-01-09 | 2007-07-11 | $7700.00 | Window Closed / Lapsed |