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Encryption

Encryption and science and art of writing messages in encrypted form or in code. And part of a field of study that deals with secret communications, used, among other purposes, to:

• authenticate the identity of users;
• authenticate and protect the confidentiality of personal communications and commercial transactions and banking;
• protect the integrity of electronic funds transfers.

A message encrypted by an encryption method should be private, that is, only those who sent and received that should have access to the contents of the message. In addition, a message should be, that is, the person who received it must verify that the sender and even someone who claims to be and be able to identify whether a message may have been modified.

The current encryption methods are safe and effective and based on the use of one or more keys. The key and a string that can contain letters, digits and symbols (such as a password), and and converted into a number, the methods used to encrypt and decrypt messages.

Currently, cryptographic methods can be divided into two broad categories, according to the type of key used: a single key cryptography and public key cryptography and privacy.

What is encryption of unique key?

A single key cryptography uses the same key to both encode and decode messages. Although this method is quite efficient in relation to the processing time, ie the time taken to encode and decode messages, the main disadvantages is the use of a secure environment for the key can be shared between persons or entities wishing to exchange encrypted information.

What is cryptography of public and private key?

The public key cryptography and private uses two different keys, one to encode and decode messages to another. In this method each person or entity has two keys: one public, which can be freely disseminated, and one private, which must be kept secret by its owner.

Messages encoded with the public key can only be decrypted using the corresponding private key.

Be the example, where Joseph and Mary want to communicate confidentially. So they have to perform the following procedures:

1. José encodes a message using the public key of Mary, which is available for the use of any person;

2. Once encrypted, José sends the message to Mary, through the Internet;

3. Maria receives and decodes the message using its private key, and that only their knowledge;

4. If Mary want to answer the message, you must perform the same procedure, but using the public key of Joseph

Although this method has much lower performance compared to processing time, when compared with the encryption key only, has the major advantage of free distribution of public keys, not requiring a secure environment so that keys are combined in advance.

Moreover, it can be used to generate digital signatures.

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