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Answer» The MAJOR distinction between a block CYPHER and a stream cypher is that a block cypher turns plain text into ciphertext one block at a time. Stream cypher, on the other hand, converts plain text into ciphertext by taking one byte of plain text at a time. | Block Cipher | Stream Cipher |
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| By converting plaintext into ciphertext one block at a time, Block Cipher converts plain text into ciphertext. | Stream Cipher takes one byte of plain text at a time and converts it to ciphertext. | | Either 64 bits or more than 64 bits are used in block ciphers. | 8 bits are used in stream ciphers. | | The ECB (ELECTRONIC Code Book) and CBC (Common Block Cipher) ALGORITHM modes are utilized in block cipher (Cipher Block Chaining). | CFB (Cipher Feedback) and OFB (Output Feedback) are the two algorithm types utilized in stream cipher (Output Feedback). | | The Caesar cipher, polygram substitution cipher, and other transposition algorithms are used in the block cipher. | Stream cipher uses substitution techniques such as the rail-fence technique, columnar transposition technique, and others. | | When compared to stream cipher, a block cipher is slower. | When compared to a block cipher, a stream cipher is slower. |
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