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Lesson 6
Objective
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Encrypting - Decrypting Data
Types and uses of encryption. |
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Encrypting and decrypting data is nothing more than passing the data through an algorithm to make something readable only to the intended recipients.
The process for encryption is essentially identical to the process for decryption. At the document level, encryption takes
an easily read plaintext file and turns it into ciphertext using a
key in conjunction with a specific algorithm. Encryption has become important not only in regard to e-mail, but also for
network communications.
Encryption strength is based on three primary factors:
Strong encryption
The U.S. government classifies encryption that uses keys in excess of 40 bits as "strong encryption." U.S. companies
wishing to export products that use "strong encryption" must first obtain State Department permission to do so. Although
40-bit keys are not always strong enough for financial transactions, they are usually sufficient for individuals' needs.
Encryption types
All types of encryption are subject to defeat. Click the View Image button below to see encryption types, descriptions and commonly
used algorithms.
Encryption threats
Encryption threats
Symmetric, or single-key, encryption is a simple process that is fast and strong. However, all parties must know and trust each other
completely, and have confidential copies of the key. Hackers can compromise symmetric keys either with a dictionary
program , password sniffing, or by simply snooping through a desk, purse, or
briefcase. One countermeasure is to change your key regularly. This can reduce the danger of having a symmetric key
compromised.
Dictionary program: A program specifically written to break into a password-protected system. A dictionary
program has a relatively large list of common password names that the program repeatedly uses to gain access .
Click the link to read about encryption terms and their descriptions.
Encryption methods Terms |
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