For symmetric ciphers, 128 bits, not characters is considered secure. Assuming the uuencode character set [A-Za-z0-9+/] it's 6 bit per character, so 22 chars on

For symmetric ciphers, 128 bits, not characters is considered secure. Assuming the uuencode character set [A-Za-z0-9+/] it's 6 bit per character, so 22 chars only. Quite doable.