John Melody Me

Cryptography II Cryptography Consists of Two Branches: 1. Cryptography is the area of constructing cryptographic systems. 2. Cryptoanalysis is the are of breaking cryptographic systems. " Cryptography is a field of computer science and mathematics that focuses on techniques for secure communication between two parties."

Cryptography K.R.G.X.B.W.O.Z.X.P.G (Cryptography) Cryptography is the science of the using secret codes. Terminology ----+---"Cryptanalyst" is someone who uses and studies secret code. Codes vs Ciphers. Codes are made to be understandable and publicly available. A cipher is a set of rules for converting between plaintext and ciphertext. For example; the Famous Caesar Cipher : Cipher Disk__ A..B..C..D..E..F..G..H..I..J..K..L..M..N..O..P..Q..R..S..T..U..V..W..X..Y..Z 0..1..2..3..4..5..6..7..8..9..10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25

Computer operated by binary codes ( 0 and 1 : Bit OFF and ON); Binary code operated by decimal (base 10) }Positional notation}; Base 8 { 0 1 2 3 4 5 6 7 } Base 10 { 0 1 2 3 4 5 6 7 8 9 } Base 12 { 0 1 2 3 4 5 6 7 8 9 A B } Alphanumeric Base 36 { 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z } Alphanumeric Base 62 { 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z } 8-bit systems : " 128 / 64 / 32 / 16 / 8 / 4 / 2 / 1 "

Children in the worlds most successful nations are not as well behaved or as well equipped to learn as they were in the past. Bringing up children has never been easy, but nowadays it's a minefield. Social changes have been no less startling. The pressure of work for all parents have increased enormously; marriages are less stable and cohabitation and divorce widespread. Unfortunately, children are not fully developed adults, they still have to move along that development continuum, acquiring the habits of civilised behaviour. Focused attention, deferred gratification, self-control , empathy and other important lessons can't be learned at electric speed.