Systems, methods and computer program products for reducing effective key length of ciphers using one-way cryptographic functions and an initial key
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United States of America Patent
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May 6, 2003
Grant Date -
N/A
app pub date -
Oct 28, 1998
filing date -
Oct 28, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Systems, methods and computer program products reduce effective key length of a symmetric key cipher by deriving an intermediate value from an initial key, using a one-way cryptographic function. Predetermined bit locations of the intermediate value are selected to obtain an intermediate key. An intermediate shortened key is derived from the intermediate key by setting predetermined bit locations of the intermediate key to predetermined values. A diffused intermediate shortened key is derived from the intermediate shortened key using the one-way cryptographic function. Predetermined bit locations of the diffused intermediate shortened key are then selected to obtain a shortened key. In first embodiments, the one-way cryptographic function is a one-way hash function. Second embodiments use the symmetric key cipher itself to perform the one-way cryptographic function.
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