However, asymmetric encryption is very slow and not intended to encrypt large amounts of data. The downside of block ciphers is that if you need to encrypt something that is not exactly as large as the block size, you need some kind of block chaining.Īsymmetric ciphers are actually block ciphers as well, so you can use them to encrypt any kind of data and also of any length using block chaining. AES can only encrypt 16 byte input to 16 byte output (regardless if AES-128, AES-192 or AES-256, this number just refers to the key length, not to the block size). Stream ciphers process data byte by byte whereas block ciphers process them block by block.īlock ciphers can only encrypt entire blocks. Ciphers are either block ciphers or stream ciphers.
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