2、密码学技术概览

密码学技术概览

1. 加密算法

• 博福特加密法 ：博福特加密法与维吉尼亚加密法类似，但使用的是移位反转的标准字母表。加密和解密时可借助博福特表，如下所示：
  | | 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 | Z | Y | X | W | V | U | T | S | R | Q | P | O | N | M | L | K | J | I | H | G | F | E | D | C | B | A |
  | B | A | Z | Y | X | W | V | U | T | S | R | Q | P | O | N | M | L | K | J | I | H | G | F | E | D | C | B |
  | C | B | A | Z | Y | X | W | V | U | T | S | R | Q | P | O | N | M | L | K | J | I | H | G | F | E | D | C |
  | D | C | B | A | Z | Y | X | W | V | U | T | S | R | Q | P | O | N | M | L | K | J | I