Expire link to save file when you go back to the front.
To reduce onscreen jitter, and form a finer appearance in motion, the info messages now read as follows.

1.5MB Save with random filename
1.5MB Save with original filename
Encrypting bit by bit of 1.5MB
1.5MB Your encrypted file is ready
1.5MB Save your encrypted file
Decrypting bit by bit of 1.5MB
1.5MB Your decrypted file is ready
1.5MB Save your decrypted file
File size is more elegant without decimal when less than a MB