Zip on BASH :-)

bala@bala-desktop:~/Desktop$ zip -e infected.zip 10199.exe
Enter password:
Verify password:
  adding: 10199.exe (deflated 9%)
bala@bala-desktop:~/Desktop$ md5sum 10199.exe
f469bf255c2c8fedec173cd17395ff11  10199.exe
bala@bala-desktop:~/Desktop$ md5sum infected/10199.exe
f469bf255c2c8fedec173cd17395ff11  infected/10199.exe
bala@bala-desktop:~/Desktop$