Method for checking data sequences
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United States of America Patent
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Aug 5, 1997
Grant Date -
N/A
app pub date -
Jul 20, 1995
filing date -
Jul 29, 1994
priority date (Note) -
Expired
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Abstract
The invention relates to a method for checking data sequences, comprising a protection step and a verification step, with a control sequence being formed in the protection step on the basis of an identification sequence, which identification sequence comprises identification values which identify data sequences which are to be protected, and which control sequence comprises control values of which at least some have been formed on the basis of operation values, which operation values have been derived from data of sequences which were identified by the said identification values, and with the data sequences being verified, in the verification step, on the basis of the control values. In accordance with the invention control values are formed, successively, by combining an identification value with an operation value related to a preceding control value. The invention is especially useful for verifying data files.
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