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AES-CTR is a stream cipher, of a particular kind where the keystream is obtained by encryption of a counter. So the question reduces to: what are drawbacks of AES-CTR compared to other stream ciphers? The main ones compared to ChaCha20 are: Without hardware support, AES can fail to cache-timing attacks. Without hardware support, AES is slower. Without ...


First, AES-CTR isn't "similar to a stream cipher." It is a stream cipher. That means the real question is "why do we develop new stream ciphers when AES-CTR provides an acceptable one?" The answer is that newer stream ciphers tend to be superior to AES in some way or another. AES is a secure cipher, but it has some bad properties; for instance, it's hard ...

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