Editing Block cipher (section)

===Brute-force attacks===
{{expand section|1=Impact of key size and block size, discuss time–m to the [[birthday attack]].|date=January 2019}} This property results in the cipher's security degrading quadratically, and needs to be taken into account when selecting a block size. There is a trade-off though as large block sizes can result in the algorithm becoming inefficient to operate.<ref>{{cite book|author=Martin, Keith M.|title=Everyday Cryptography: Fundamental Principles and Applications|publisher=Oxford University Press|year=2012|isbn=9780199695591|page=114|url=https://books.google.com/books?id=5DZ_vv-gl4oC&pg=PA114}}</ref> Earlier block ciphers such as the [[Data Encryption Standard|DES]] have typically selected a 64-bit block size, while newer designs such as the [[Advanced Encryption Standard|AES]] support block sizes of 128 bits or more, with some ciphers supporting a range of different block sizes.<ref>{{cite book|last=Paar|first=Christof|title=Understanding Cryptography: A Textbook for Students and Practitioners|publisher=Springer|year=2010|isbn=9783642041006|page=30|url=https://books.google.com/books?id=f24wFELSzkoC&pg=PA30|display-authors=etal}}</ref>