Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
1999-11-15
2004-11-30
Sheikh, Ayaz (Department: 2131)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C713S190000, C713S152000, C380S029000, C380S037000
Reexamination Certificate
active
06826691
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to encryption/decryption of data, and to data carriers incorporating arrangements for encryption/decryption of data.
BACKGROUND OF THE INVENTION
Electronic devices are commonly used to carry data (such as, for example, financial or personal data) which must be kept secure from unauthorised access. A typical method of preventing unauthorised access to data carried in such devices is by the use of a password.
A typical, known password scheme involves the use of the known Data Encryption Standard (DES) to encrypt/decrypt the password. In its steps the Data Encryption Standard algorithm requires data to be permuted in a predetermined manner.
The practical implementation of the Data Encryption Standard typically requires the presence of extra registers and/or additional processing steps to effect the required permutations.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an arrangement for encryption/decryption of data, and a data carrier incorporating same, in which the above disadvantages are overcome or at least alleviated.
In accordance with a first aspect of the invention there is provided an arrangement for encryption/decryption of data as claimed in claim
1
.
In accordance with a second aspect of the invention there is provided an arrangement for encryption/decryption of data as claimed in claim
2
.
In accordance with a third aspect of the invention there is provided a data carrier incorporating an arrangement for encryption/decryption of data as claimed in claim
6
.
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Freescale Semiconductor Inc.
Moorthy Aravind
Sheikh Ayaz
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