Encryption

Due to the required disclosure of encryption algorithms by software manufacturers to government agencies and their ability to install malware which can monitor keystrokes and content of the memory of personal computers, successful encryption precludes entry of an unencrypted text on any computer connected to the internet or use of such a computer to encrypt. The appearance of encrypted messages which cannot be decoded using the usual algorithms may mark the sender and receiver as using sophisticated encryption and warranting further attention. Ordinary codes such as substitution of one letter for another can be broken quickly by security agencies.