## How long is a 128-bit password?

In order to provide enough material for a 128-bit key, a password, consisting of letters and punctuation marks, should be at least 26 characters long; if the password contains also digits, the length may be decreased to 24.

**What is a 128-bit key?**

128-bit encryption is a data/file encryption technique that uses a 128-bit key to encrypt and decrypt data or files. It is one of the most secure encryption methods used in most modern encryption algorithms and technologies. 128-bit encryption is considered to be logically unbreakable.

### How many possible keys are there when using a cipher with a key size of 128 bits?

2128 possible combinations

With a 128-bit key, there are 2128 possible combinations. But thanks to a quantum computer’s ability to probe large numbers, only the square root of the number of combinations needs to be examined — in this case, 264. This is still a huge number, and AES should remain secure with increased key sizes, Mosca says.

**How many characters is a 128-bit key?**

An AES 128-bit key can be expressed as a hexadecimal string with 32 characters.

## How do I get AES 128 key?

On the command line, type:

- For 128-bit key: openssl enc -aes-128-cbc -k secret -P -md sha1.
- For 192-bit key: openssl enc -aes-192-cbc -k secret -P -md sha1.
- For 256-bit key: openssl enc -aes-256-cbc -k secret -P -md sha1. “secret” is a passphrase for generating the key. The output from the command is similar to:

**How many numbers is 128 bits?**

The 128-bit data type can handle up to 31 significant digits (compared to 17 handled by the 64-bit long double). However, while this data type can store numbers with more precision than the 64-bit data type, it does not store numbers of greater magnitude.

### What is the most difficult password?

1. Mix meanless Word, number and symbol randomly, and at least 15 length. Mix meanless Word, number and symbol randomly, and at least 15 length (mix uppercase and lowercase). Actually, strongest password equals to hardest remember password, for example “E7r9t8@Q#h%Hy+M”.

**How do I know if I have 128-bit encryption?**

To verify that the 128-bit encryption is in place, start the new browser, select the Help menu item from the top pull-down bar and choose About Internet Explorer… On the screen that appears, Windows users will see displayed the 128-bit cipher strength.