Certificate validity checking
AssigneeThomson Licensing
InventorAlain Durand
Life of this patent
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Abstract
A method for checking a validity of a certificate (600) containing a key associated to a network device (601) in a network, comprises receiving at the network an encrypted content (611) and a validity index (630) associated to the content. The validity of the certificate is evaluated from a time index (606) contained within the certificate, the time index having a value corresponding to a time of issue of the certificate, and from the validity index associated to the encrypted content.
Claims19
A method for decrypting encrypted data by a network device in a network, the data allowing decryption of an encrypted content, the network device storing a certificate containing a key associated to the network device in the network, the method comprising, in the network device:
- receiving the encrypted data and a validity index associated to the content;
- evaluating, without reference to a clock, a time validity of the certificate using a time index contained within the certificate, and the validity index associated to the encrypted content, the time index having a value corresponding to a time of issue of the certificate;
- and
- decrypting the encrypted data only when the certificate is evaluated to be valid.
A system for decrypting encrypted data allowing decryption of an encrypted content, the system comprising:
- a network device storing a certificate containing a key associated to the network device, the network device being configured to:
- receive the encrypted data and a validity index associated to the content;
- evaluate, without reference to a clock, a time validity of the certificate using a time index of the certificate and the validity index associated to the encrypted content, the time index having a value corresponding to a time of issue of the certificate;
- and
- decrypt the encrypted data only when the certificate is evaluated to be valid.
Dependencies are inferred from the claim text.