密码学算法的实现，包括得到大随机数，CFB、ECB、lehmann算法的实现。-cryptography algorithm implementation, including access to large random number, CFB, and the ECB, LEHMANN algorithm implementation.

椭圆曲线加密算法的java语言的实现，适合密码学初学者-Java elliptic curve encryption algorithm implementation language, suitable for beginners cryptography