9, Claude Shannon of Bell Laboratories published the fundamental theory behind secret- key ciphers, and the decades of evolution since then have yielded high- caliber examples. Secret- key ciphers can be used to protect critical/sensitive data.īecause secret- key ciphers use a single key that Bob and Alice must share, this is also known as symmetric cryptography.

Today's ciphers use either secret- key or public- key techniques. Even the sharpest hacker in the world will be unable to decrypt data as long as the key remains secret. Quality encryption always follows a fundamental rule: the actual procedure being used, the algorithm, doesn't need to be kept secret. He must use the same cipher as Alice, or he won't be able to decrypt her messages, and she won't understand his replies. If Alice sends encrypted files to Bob, Bob can't choose the cipher to use. For example, to ensure secure connections between a Web site and just about any browser, the site must support RC4, since the overwhelming majority of Web browsers support that cipher. The basic notion of all ciphers is to allow two people - popularly called. This primer will help you decipher the jumble of TLAs (three- letter acronyms) that define encryption. General philosophy and net-born resources are discussed. Introduction This document covers some of the main issues that affect Linux security. Learn about encryption and cryptography basics and the key concepts behind different types of encryption algorithms to help protect your enterprise. Heartbleed is a security bug in the OpenSSL cryptography library, which is a widely used implementation of the Transport Layer Security (TLS) protocol. But what's the difference? How do you know if you're buying industrial- strength protection or if your developers are choosing the right encryption algorigthms for the job? Where do you begin to make sense of it all? Now, the problem is to sort out the choices.

Today, we have a broad selection of stronger, faster and better- designed algorithms. 0s, there was only one real choice - the Data Encryption Standard (DES). Whether your company's protecting customer credit card information, securing remote user connections to your network or protecting your intellectual property from digital piracy, you're using encryption every day.īut crypto can be intimidating to the uninitiated, and there are a daunting array of options. AES, DES, RSA, ECC - there are so many ways to encrypt your data. Understanding encryption and cryptography basics.

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