G - Physics – 09 – F
Patent
G - Physics
09
F
G09F 3/03 (2006.01) G06Q 10/08 (2012.01) G09C 5/00 (2006.01)
Patent
CA 2674827
Prior art tamper evident seals are manufactured, distributed to end-users, and then individually applied to the task of sealing a container (an envelope in the preferred embodiment) and at a later time and/or distant place, individually verified for tamper clues, and finally broken so that the contents may be retrieved with some assurance of confidentiality and integrity. The present invention enhances the security of the verification phase with an encrypted data representation of the individual seal item, captured at manufacturing time and used at verification time for more comprehensive tamper clues information. The encryption is a cryptographic symmetric key algorithm; the symmetric key is legibly present on the seal unit and preferably nowhere else, but the ciphertext is kept in a server operated by the overseeing organization. With this arrangement, an enemy wishing to make a exact duplicate seal needs access to both the seal unit and the ciphertext, so he would interact with the server and his access would be noticed as suspect. The difficulty of copying a seal is raised by the detailed information encrypted at the server, this exact same information that will be available for the legitimate verifier. In some variants of the invention intended for low volume tamper seal applications, the singularity of each seal unit is increased by manual alterations (at manufacturing time) to an intermediate seal form made by automated means. Such natural variability, an image of which is part of the detailed tamper clues information, is expected to make seal duplication even more difficult.
Connotech Experts-Conseils Inc.
Moreau Thierry
Na
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