Book setting definition

However, Electronic Code Book is not a good system to use with small block sizes (for example, smaller than 40 bits) and identical encryption modes. This is because some words and phrases may be reused often enough so that the same repetitive part-blocks of ciphertext can emerge, laying the groundwork for a codebook attack where the plaintext patterns are fairly obvious. However, security may be improved if random pad bits are added to each block. On the other hand, 64-bit or larger blocks should contain enough unique characteristics (entropy) to make a codebook attack unlikely to succeed.

Book setting definition

book setting definition

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