Method and apparatus for data encryption

A method for encrypting binary data, the binary data comprising 64-bit data blocks, the method comprising the steps of:

• splitting the 64-bit data block into a left 32-bit block and a right 32-bit block;
• using the left 32-bit block to access and retrieve a 32-bit number from a table containing 256 32-bit numbers;
• exclusive-ORing the right 32-bit block with the 32-bit number obtained from the table;
• rotating the left 32-bit block according to a predefined rotation schedule;
• relabelling the rotated left 32-bit data block as the right 32-bit data block and relabelling the product of the exclusive-OR operation as the left 32-bit data block;
• and
• repeating the using, exclusive-ORing, rotating said relabelling steps until the binary data appears to be a random number.

A method for encrypting data, the data comprising 64-bit data blocks, the method comprising the steps of:

• calculating, prior to the start of data encryption, a standard table of pseudo-random permutations;
• selecting a user-defined key;
• first exclusive-ORing of the 64-bit data block with the key;
• splitting the product of the first exclusive-ORing into a left and right 32-bit half;
• using the left 32-bit half as an index to access the standard table and retrieve a 32-bit pseudo-random number;
• second exclusive-ORing the right 32-bit half with the 32-bit pseudo-random number;
• relabelling the product of the second exclusive-ORing of the right half and the 32-bit pseudo-random number as the left 32-bit half;
• rotating the left 32-bit half according to a predefined schedule;
• relabelling the left 32-bit half as the right 32-bit half after the rotation;
• first repeating the steps of using, second exclusive-ORing, relabelling, rotating and relabelling a predefined number of times;
• and
• repeating the first exclusive-ORing step prior to the first repeating step every eighth time the first repeating step is performed.

A method for encrypting binary data, the binary data comprising 64-bit data blocks, the method comprising the steps of:

• splitting the 64-bit data block into a left 32-bit block and a right 32-bit block;
• using the left 32-bit block to access and retrieve a 32-bit number from a table containing 32-bit numbers, the table being computed using a user-supplied key;
• exclusive-ORing the right 32-bit block with the 32-bit number obtained from the table;
• rotating the left 32-bit block according to a predefined rotation schedule;
• relabelling the rotated left 32-bit data block as the right 32-bit data block and relabelling the product of the exclusive-OR operation as the left 32-bit data block;
• and
• repeating the using;
• exclusive-ORing, rotating and relabelling steps until the binary data appears to be a random number.

A method for encrypting binary data, the binary data comprising N-bit data blocks, the method comprising the steps of:

• splitting the N-bit data block into a left N/2-bit block and a right N/2-bit block;
• using the left N/2-bit block to access and retrieve a N/2-bit number from a table containing N/2-bit numbers, the table having been computed prior to the splitting step;
• exclusive OR-ing the right N/2-bit block with the N/2-bit number obtained from the table;
• rotating the left N/2-bit block according to a predefined rotation schedule;
• relabelling the rotated left N/2-bit data block as the right N/2-bit data block and relabelling the product of the exclusive-OR operation as the left N/2-bit data block;
• and
• repeating the using, exclusive-ORing, rotating and relabelling steps until the binary data appears to be a random number.

A method for encrypting binary data, the binary data comprising 64-bit data blocks, the method comprising the steps of:

• splitting the 64-bit data block into a left 32-bit block and a right 32-bit block;
• using the left 32-bit block to access and retrieve a 32-bit number from a table containing 32-bit numbers, the table having been computed prior to the splitting step;
• reversibly mixing the right 32-bit block with the 32-bit number obtained from the table;
• rotating the left 32-bit block according to a predefined rotation schedule;
• relabelling the rotated left 32-bit data block as the right 32-bit data block and relabelling the product of the mixing operation as the left 32-bit data block;
• and
• repeating the using, mixing, rotating and relabelling steps until the binary data appears to be a random number.