Process for data certification by scrambling and certification system using such a process
First Claim
1. A method for certifying data (ECG1) which arise from a source forming part of a first entity and are intended for at least one user, said method comprising the steps of:
- scrambling said data arising from said source using a first string of control words CW1, so as to construct a first scrambled item IE(ECG1),encrypting said first string of control words CW1 using a first key KA, so as to construct a first string of encrypted control words E(CW1)KA,wherein said scrambling and encryption steps are performed by an authority independent of the first entity and also of the user, said method further comprising the steps of;
transferring, to the user, said first scrambled item IE(ECG1) and said first string of encrypted control words E(CW1)KA, anddecrypting said first string of encrypted control words E(CW1)KA and descrambling said first scrambled item IE(ECG1) using means supplied to the user under the control of said independent authority.
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Accused Products
Abstract
The invention relates to a process for data certification as well as to the system implementing the certification process.
The certification of the data is performed by scrambling.
An authority independent of the entity which controls the data source and of the user(s) for which these data are intended, scrambles the data with the aid of control words and encrypts the control words with the aid of an encryption algorithm with key K.
So that a user or the users can descramble the data scrambled by the independent authority, a certification verification device containing the encryption key K is supplied to the user or users under the control of the independent authority.
The certification process and the system associated therewith apply more particularly to conditional-access systems.
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Citations
27 Claims
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1. A method for certifying data (ECG1) which arise from a source forming part of a first entity and are intended for at least one user, said method comprising the steps of:
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scrambling said data arising from said source using a first string of control words CW1, so as to construct a first scrambled item IE(ECG1), encrypting said first string of control words CW1 using a first key KA, so as to construct a first string of encrypted control words E(CW1)KA, wherein said scrambling and encryption steps are performed by an authority independent of the first entity and also of the user, said method further comprising the steps of; transferring, to the user, said first scrambled item IE(ECG1) and said first string of encrypted control words E(CW1)KA, and decrypting said first string of encrypted control words E(CW1)KA and descrambling said first scrambled item IE(ECG1) using means supplied to the user under the control of said independent authority. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for certifying data which arise from a source and are intended for at least one user, said source forming part of a first entity, comprising:
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a first scrambling and encryption device, forming part of an authority independent of the first entity and also of the user, for scrambling said data arising from said source using a first string of control words CW1 so as to construct a first scrambled item IE(ECG1) and for encrypting said first string of control words using a first key KA so as to construct a first string of encrypted control words E(CW1)KA ; and a certification verification device supplied to the user under the control of the independent authority and comprising circuits for decrypting said first string of encrypted control words E(CW1)KA and for descrambling said first scrambled item IE(ECG1) using said first string of decrypted control words CW1. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification