Modified counter mode encryption

Abstract

A modified Counter Mode encryption technique encrypts data by receiving a seed value, generating a first value from an operation of the seed value and the plaintext; and encrypting the first value using a block encryption cipher to produce ciphertext. The operation may be an exclusive-or operation. The seed value may be a counter value based upon a position of the block of plaintext in a record of plaintext, where the length of the counter value is based upon the length of the block. The counter value may be generated by adding an initialization vector to a product of an index value and a multiplier value, where the multiplier value comprises a randomly-generated value, the index value is based upon the position of the block of plaintext in the record of plaintext, and the length of the initialization vector and the length of the multiplier value are based upon the length of the block.

Dependencies are inferred from the claim text.