中文摘要：

SHA-1在许多安全协议中广为使用，包括TLS和SSL、PGP、SSH、S／MIME和IPsec，曾被视为是MD5的后继者。依托基于SHA-1加密算法的Android系统屏幕图案锁实例，对SHA-1加密算法完成了C语言实现，同时对图案锁进行了暴力破解，简要探讨了屏幕锁安全性问题。

英文摘要：

SHA- 1 widely used in many security protocols, including TLS and SSL, PGP, SSH, S/MIME and IPsee, has been seen as the successors of the MDS. In this paper, based on the encryption algorithm based on SHA - 1 the Android lock screen design examples, the encryption algorithm for SHA. 1 completed the C language implementation, design lock for the brute force at the same time, briefly discusses the screen lock security problems.