Database encryption and decryption circuit and method using subkeys
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United States of America Patent
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-
Mar 1, 1983
Grant Date -
N/A
app pub date -
Jan 30, 1980
filing date -
Jan 30, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An encryption and decryption circuit and method using subkeys which is therefore particularly useful for the encryption and decryption of database information. Each data field has a corresponding write key and a different read key. A database record is encrypted by multiplying each field by its corresponding write key and adding up all such products modulo the product of all read keys. The read keys must be prime numbers and the write keys must satisfy a certain relationship with respect to the read keys. A database record may have a single field decrypted by dividing the encrypted record by the read key for that field and taking the remainder. The security of each field may thereby be individually controlled without compromising the security of the entire record.
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