초록

The certification process and the system associated therewith apply more particularly to conditional-access systems.

대표청구항 ▼

[ We 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 fir

[ We 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).sub.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).sub.KA, anddecrypting said first string of encrypted control words E(CW1).sub.KA and descrambling said first scrambled item IE(ECG1) using means supplied to the user under the control of said independent authority.