SQLite does not support encryption or passwords. There are a few extensions that add the capability for encryption, among these are The SQLite Encrytion Extension (SEE), SQLite-Crypt, wxsqlite3 and SQLCipher. However none of these provides with the tcl bindings to be able to manipulate an SQLite database from tcl code.
I will show you how to achieve this, but it will take a bit of work. You need to download MinGW/MSYS, OpenSSL and the SQLCipher source code. After that follow these steps:
1 - install MinGW/MSYS
2 - install OpenSSL (requires Visual C++ 2008 Redistributables)
3 - create an sqlcipher directory and place all the files from the SQLCipher zip
4 - copy openSSL/bin/libeay32.dll to sqlcipher directory.
5 - copy openSSL/lib/MinGW to /MinGW/lib directory.
6 - go to the sqlcipher directory and compile using the following command:
./configure CFLAGS="-DSQLITE_HAS_CODEC -I/c/openssl/include" LDFLAGS="-leay32 -L/c/openssl/lib"
7 - type make
8 - type make dll
These will create an sqlite3.exe and sqlite3.dll with tcl bindings.
When trying to encrypt a database just type: PRAGMA key = 'password'
That's all.