PREVENTING PATTERN RECOGNITION IN ELECTRONIC CODE BOOK ENCRYPTION

摘要

In general, in one aspect, noise is injected into a bitmap associated with content to be presented on a display to create a noisy bitmap. The noisy bitmap is encrypted using electronic code book (ECB) encryption. The resulting ciphertext does not include recognizable patterns from the content as is typical with ECB encryption. The injection of noise may include modifying pixel values for at least a subset of pixels in the bitmap. The pixel values may be modified by using a counter, a known modification pattern, or a random number generator. The bitmap may be analyzed to determine how the bitmap can be modified to maximize the randomness of the bitmap while ensuring that the noisy bitmap is visually perceptually similar when presented. The noise may be injected into a block of pixels prior to the block being encrypted.

主权项

1. A method comprising
injecting noise into a bitmap associated with content to be presented on a display to create a noisy bitmap; and encrypting the noisy bitmap using electronic code book (ECB) encryption, wherein resulting ciphertext will not include recognizable patterns from the content.