What is encryption Definition from What. Is. com. Encryption is the conversion of electronic data into another form, called ciphertext, which cannot be easily understood by anyone except authorized parties. By submitting your personal information, you agree that Tech. Target and its partners may contact you regarding relevant content, products and special offers. You also agree that your personal information may be transferred and processed in the United States, and that you have read and agree to the Terms of Use and the Privacy Policy. The primary purpose of encryption is to protect the confidentiality of digital data stored on computer systems or transmitted via the Internet or other computer networks. Data Encryption Techniques Since youre interested in ENCRYPTION, maybe youd like these Microsoft. Net a billion dollar boondoggle The U. S. EPA is LYING to us. Codes. Caesar Cipher This is an online, JavaScript enabled version of a Caesar cipher program, for you to try. Also, there is a FREE version of the Caesar cipher. Playfair_Cipher_01_HI_to_BM.png' alt='How To Crack A Cipher Text Encryption' title='How To Crack A Cipher Text Encryption' />Encryption is the conversion of data into a form, called a ciphertext, that cannot be easily understood by unauthorized people. Decryption is the process of. Modern encryption algorithms play a vital role in the security assurance of IT systems and communications as they can provide not only confidentiality, but also the following key elements of security Authentication the origin of a message can be verified. Integrity proof that the contents of a message have not been changed since it was sent. Non repudiation the sender of a message cannot deny sending the message. History of encryption. The word encryption comes from the Greek word kryptos, meaning hidden or secret. The use of encryption is nearly as old as the art of communication itself. As early as 1. 90. BC, an Egyptian scribe used non standard hieroglyphs to hide the meaning of an inscription. In a time when most people couldnt read, simply writing a message was often enough, but encryption schemes soon developed to convert messages into unreadable groups of figures to protect the messages secrecy while it was carried from one place to another. The contents of a message were reordered transposition or replaced substitution with other characters, symbols, numbers or pictures in order to conceal its meaning. In 7. 00 BC, the Spartans wrote sensitive messages on strips of leather wrapped around sticks. When the tape was unwound the characters became meaningless, but with a stick of exactly the same diameter, the recipient could recreate decipher the message. Later, the Romans used whats known as the Caesar Shift Cipher, a monoalphabetic cipher in which each letter is shifted by an agreed number. So, for example, if the agreed number is three, then the message, Be at the gates at six would become eh dw wkh jdwhv dw vla. At first glance this may look difficult to decipher, but juxtapositioning the start of the alphabet until the letters make sense doesnt take long. Also, the vowels and other commonly used letters like T and S can be quickly deduced using frequency analysis, and that information in turn can be used to decipher the rest of the message. The Middle Ages saw the emergence of polyalphabetic substitution, which uses multiple substitution alphabets to limit the use of frequency analysis to crack a cipher. This method of encrypting messages remained popular despite many implementations that failed to adequately conceal when the substitution changed, also known as key progression. Possibly the most famous implementation of a polyalphabetic substitution cipher is the Enigma electro mechanical rotor cipher machine used by the Germans during World War Two. It was not until the mid 1. Until this point, all encryption schemes used the same secret for encrypting and decrypting a message a symmetric key. In 1. 97. 6, B. Whitfield Diffie and Martin Hellmans paper New Directions in Cryptography solved one of the fundamental problems of cryptography, namely how to securely distribute the encryption key to those who need it. This breakthrough was followed shortly afterwards by RSA, an implementation of public key cryptography using asymmetric algorithms, which ushered in a new era of encryption. How we use encryption today. Until the arrival of the Diffie Hellman key exchange and RSA algorithms, governments and their armies were the only real users of encryption. However, Diffie Hellman and RSA led to the broad use of encryption in the commercial and consumer realms to protect data both while it is being sent across a network data in transit and stored, such as on a hard drive, smartphone or flash drive data at rest. Devices like modems, set top boxes, smartcards and SIM cards all use encryption or rely on protocols like SSH, SMIME, and SSLTLS to encrypt sensitive data. Encryption is used to protect data in transit sent from all sorts of devices across all sorts of networks, not just the Internet every time someone uses an ATM or buys something online with a smartphone, makes a mobile phone call or presses a key fob to unlock a car, encryption is used to protect the information being relayed. Digital rights management systems, which prevent unauthorized use or reproduction of copyrighted material, are yet another example of encryption protecting data. How encryption works. Data, often referred to as plaintext, is encrypted using an encryption algorithm and an encryption key. This process generates ciphertext that can only be viewed in its original form if decrypted with the correct key. Decryption is simply the inverse of encryption, following the same steps but reversing the order in which the keys are applied. Todays encryption algorithms are divided into two categories symmetric and asymmetric. Symmetric key ciphers use the same key, or secret, for encrypting and decrypting a message or file. The most widely used symmetric key cipher is AES, which was created to protect government classified information. Symmetric key encryption is much faster than asymmetric encryption, but the sender must exchange the key used to encrypt the data with the recipient before he or she can decrypt it. This requirement to securely distribute and manage large numbers of keys means most cryptographic processes use a symmetric algorithm to efficiently encrypt data, but use an asymmetric algorithm to exchange the secret key. Asymmetric cryptography, also known as public key cryptography, uses two different but mathematically linked keys, one public and one private. The public key can be shared with everyone, whereas the private key must be kept secret. RSA is the most widely used asymmetric algorithm, partly because both the public and the private keys can encrypt a message the opposite key from the one used to encrypt a message is used to decrypt it. This attribute provides a method of assuring not only confidentiality, but also the integrity, authenticity and non reputability of electronic communications and data at rest through the use of digital signatures. Cryptographic hash functions. A cryptographic hash function plays a somewhat different role than other cryptographic algorithms. Hash functions are widely used in many aspects of security, such as digital signatures and data integrity checks. Configure Windows Recovery Environment For Bit Locker Key. They take an electronic file, message or block of data and generate a short digital fingerprint of the content called a message digest or hash value. The key properties of a secure cryptographic hash function are Output length is small compared to input. Computation is fast and efficient for any input. Any change to input affects lots of output bits. One way value the input cannot be determined from the output. Strong collision resistance two different inputs cant create the same output. Hour of Code Simple Encryption. Your browser is not supported. Please upgrade your browser to one of our supported browsers. You can try viewing the page, but expect functionality to be broken. App Lab works best on a desktop or laptop computer with a mouse and keyboard. You may experience issues using this tool on your current device. Game Lab works best on a desktop or laptop computer with a mouse and keyboard. You may experience issues using this tool on your current device. Unfortunately, were currently experiencing issues with loading Web Lab on this browser. You may want to use a different browser until this is resolved. 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