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What you are describing is known as a Stream Cipher. As to the differences, the linked article can be cited to get you started: Stream ciphers are often used for their speed and simplicity of implementation in hardware, and in applications where plaintext comes in quantities of unknowable length like a secure wireless connection. If a block cipher (not ...


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From the security advisory that you posted, it appears to me that the design error can be summarised as The PRNG is a hash function. the input to the PRNG(hash function), half of it is from the previous PRNG output, which is known, you can just read it off the previous output. So essentially the hash-function SHA-1's strength becomes halved - 80 bits ...



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