1024-bit ciphers are always stronger than 512-bit ciphers

In order to achieve smallest file size, it's better to encrypt then compress, rather than compress then encrypt.

If an efficient algorithm for integer factorisation is found, AES would be insecure.

What is an appropriate AES key size for achieving medium-term protection against a very powerful attacker?

What is an appropriate RSA key size for achieving medium-term protection against a very powerful attacker?

Select all of the attacks which specifically apply to authentication protocols.

What is two-factor authentication? Provide an example attack scenario where the second factor of authentication would prevent a security compromise.

Symmetric cryptography is very useful when performing key distribution.