1. 创建加密数据库

$ sqlcipher encrypted.db
SQLCipher version 3.8.4.3 2014-04-03 16:53:12
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> PRAGMA key = 'thisiskey';
sqlite> create table encrypted (id integer, name text);
sqlite> .schema
CREATE TABLE encrypted (id integer, name text);
sqlite> .q

2. 打开加密数据库

$ sqlcipher encrypted.db
SQLCipher version 3.8.4.3 2014-04-03 16:53:12
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> PRAGMA key = 'thisiskey';
sqlite> .schema
CREATE TABLE encrypted (id integer, name text);

3. 修改数据库密码

sqlite> PRAGMA rekey = 'newkey';

4. 加密已有的数据库

$ sqlcipher banklist.sqlite3 
SQLCipher version 3.8.4.3 2014-04-03 16:53:12
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> ATTACH DATABASE 'encrypted.db' AS encrypted KEY 'thisiskey';
sqlite> SELECT sqlcipher_export('encrypted');
sqlite> DETACH DATABASE encrypted;

5. 解密数据库

$ sqlcipher encrypted.db 
SQLCipher version 3.8.4.3 2014-04-03 16:53:12
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> PRAGMA key = 'thisiskey';
sqlite> ATTACH DATABASE 'plaintext.db' AS plaintext KEY '';
sqlite> SELECT sqlcipher_export('plaintext');
sqlite> DETACH DATABASE plaintext;

参考资料：

• SQLCipher的使用
• SQLCipher API