Stream cipher is one that encrypts a digital data stream one bit or one byte at a time
Block cipher is one in which a block of plaintext is treated as a whole n used to produce a ciphertext block of equal length
hmmmmmmm got it!!!
A block cipher divides plain text into a sequence of text groups. It operates on each group to encode it, gives it to output, and restarts with the next text group.
A nontrivial block cipher could perform several complex transformations of the grouped text in a sequence. A trivial block cipher could reverse the order of the text characters in every group of six characters. "This is a nonsensical test." could be encoded as "i sihTon a sisnesnet lac.ts"
A stream cipher operates continuously on incoming text. As it examines each character, it operates on it and sends it to output, and continues without restarting.
A nontrivial stream cipher could examine a group of characters starting at the current character, and operate on the group to send an encoded character to output, discarding the current character and fetching the next character ahead of the group. A trivial stream cipher could send the character that alphabetically precedes each character of text. "This is nice" could be encoded as "Sghr~hr~mhbd"
Every block cipher involves a transformation of a block of plaintext into a block of ciphertext, where the transformation depends on the key. The mechanism of diffusion seeks to make the statistical relationship between the plaintext and ciphertext as complex as possible in order to thwart (hinder or prevent) attempts to deduce the key. Confusion seeks to make the relationship between statistics of the cipher text and the value of the encryption key as complex as possible, again to thwart attempts to discover the key.
difference between cross section and block daigram
Some characteristics of an Advanced Symmetric Block Cipher are key dependent S-boxes, data dependent rotation, variable plaintext or ciphertext block length, and operations on both plain and ciphered data.
2352 bytes (the size of a block)
67ci
mrs. okelley is mean
yes there is.
A carton has 24 drinks in it and a block has 30
A semi-block letter is less formal than a block letter.
There is no difference.
No such thing as a 350 big block.
The bore and stroke.