Information Security
Mamoona Jabbar
,Information Security
Topic: Modern Cryptology
,Classification
Classification of
of Symmetric
Symmetric encryption
encryption scheme
scheme
Digital data is represented in strings of binary digits (bits) unlike alphabets.
Modern cryptosystems need to process this binary strings to convert in to
another
binary string. Based on how these binary strings are processed, a symmetric
encryption schemes can be classified in to:
1. Block Cipher
2. Stream Cipher
, Block Cipher
In this scheme, the plain binary text is processed in blocks (groups) of bits at a
time; i.e. a block of plaintext bits is selected, a series of operations is performed
on this block to generate a block of cipher text bits. The number of bits in a
block is fixed. For example, the schemes DES and AES have block sizes of 64
and 128, respectively.
Mamoona Jabbar
,Information Security
Topic: Modern Cryptology
,Classification
Classification of
of Symmetric
Symmetric encryption
encryption scheme
scheme
Digital data is represented in strings of binary digits (bits) unlike alphabets.
Modern cryptosystems need to process this binary strings to convert in to
another
binary string. Based on how these binary strings are processed, a symmetric
encryption schemes can be classified in to:
1. Block Cipher
2. Stream Cipher
, Block Cipher
In this scheme, the plain binary text is processed in blocks (groups) of bits at a
time; i.e. a block of plaintext bits is selected, a series of operations is performed
on this block to generate a block of cipher text bits. The number of bits in a
block is fixed. For example, the schemes DES and AES have block sizes of 64
and 128, respectively.
