| 摘要 |
In a preferred embodiment, an identification code having therein both general information which is encrypted using standards symbologies and security information which is encrypted using a unique symbology. In the case of bar codes, the bar code may include two separate sets of bars. One set of bars may include basic information, for example an employee's identification number, encrypted using standard symbologies which may be read in any standard reader. The other set of bars includes security information which is encrypted using a unique symbology which can be read only in a special reader and which is meaningless to a standard bar code reader or bar code duplicator. Thus, where security is a factor, the special readers would be provided; but, where security is not a factor, the basic identification could be read by any standard reader.
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