## Symmetric And Asymmetric Cryptography

- [Voiceover] There are many different kinds of encryption algorithms and there are different ways that we can categorize them. Two of the major categories of encryption algorithms are symmetric and asymmetric algorithms. You're probably already familiar with the concept of symmetry meaning that two things are the same. Symmetric shapes have two sides that when divided along an axis are identical. The human face is an example of a symmetric object. In cryptography, symmetry relates to keys rather than shapes. We have two categories of encryption algorithms. In symmetric encryption algorithms, also known as shared secret encryption algorithms, the encryption and decryption operations use the same key. If one user encrypts a message using the secret key, apple, the second user would then decrypt the message using that same key, apple. It's a shared secret. Asymmetric encryption algorithms on the other hand use different keys for encryption and decryption. They're also known as public key encryption algorithms and they use the concept of a keypair that I'll discuss more in a moment. First, let's dive more into symmetric encryption. You can think of a shared secret key as the password to a message. Let's say that Alice and Bob want to communicate with each other. If they both know the same shared secret, they can use it to exchange encrypted messages with each other. This works great when we only have two people involved. They can simply agree on an encryption key and then use it communicate it with each other. If we have three people involved, now we need to change things a little bit. Alice and Bob can still use their shared secret key to communicate with each other privately but now Charlie joins the picture and wants to be able to communicate with Alice or Bob. Each pe Continue reading >>

## Name The Difference Between Symmetric And Asymmetric Cryptography

Name the Difference Between Symmetric and Asymmetric Cryptography During your IT interview, you may be asked to state the difference between symmetric and asymmetric key cryptography. This article goes through the basic similarities, differences, advantages, and disadvantages of symmetric and asymmetric encryption key systems. The Difference Between Symmetric and Asymmetric Key Cryptography Main Facts Symmetric key cryptography (also called Secret key cryptography) features one key that two people can use to encrypt and decrypt data send between themselves. All parties who want to decrypt the cyphertext need to have access to the secret key to use symmetric key cryptography for confidential communication. Asymmetric key cryptography (also called Public key cryptography) utilizes two keys. One of the keys is public and is used for encrypting data, while the second key is private and it is used for decrypting the data. Advantages and Disadvantages of Symmetric Key Cryptography Symmetric key cryptography is very accessible and easy to use. There is one key shared between two people. While this could be extremely convenient, the confidentiality it manages to achieve is actually limited. The core disadvantage of symmetric key cryptography is that confidentiality depends entirely on the two people or parties who share the code. If one of them shares the code with a third party, confidentiality is breached. Moreover, the more the two people use the key to encrypt data on the Internet, the more vulnerable the information is. This happens because the same key can be used to decrypt data. Advantages and Disadvantages of Asymmetric Key Cryptography With asymmetric keys, data can be encrypted by using a public key and the decrypted by using a secret key. At the same time, the data Continue reading >>

## Cryptography - Asymmetric Vs Symmetric Encryption - Information Security Stack Exchange

I am currently taking a principles of information security class. While talking about different encryption methods a large number of my classmates seem to believe that Asymmetric Encryption is better (more secure) than Symmetric Encryption. A typical statement is something like this: Generally asymmetric encryption schemes are more secure because they require both a public and a private key. Certainly with symmetric encryption you have to worry about secure key exchange but as far as I can tell there's no inherent reason why one must be more secure than the other. Especially given that the asymmetric part is often just used for the key exchange and then the actual data is encrypted with a symmetric algorithm. So, am I missing something or can a general statement like this really be made about which is more secure. So if I have a message encrypted with AES and another copy encrypted with RSA and all other things being equal which is more likely to be cracked. Can this comparison even be made? There is no way to directly compare them. I would point out the only thing we can say is secure is one time truly random pad based XOR stream cipher (which is symmetric), however key exchange is a major problem. We can also say that we can, in theory, break RSA and El Gammel (the two main asymmetric) algorithms) with quantum computing, we just haven't built the device to actually do it.. ewanm89 Sep 16 '11 at 23:39 For the same key size typically the asymmetric encryption (especially RSA) is less secure. Of course in practice you offset this by using larger keys. starblue Sep 17 '11 at 7:54 More secure is generally a unmeasurable quantity. Resistance of message M to attack X by threat Y is much more meaningful. this.josh Sep 18 '11 at 4:15 ECRYPT does a periodic assessment of the r Continue reading >>

## Symmetric Vs. Asymmetric Encryption What Are Differences?

Symmetric vs. Asymmetric Encryption What are differences? / SSL Information /Symmetric vs. Asymmetric Encryption What are differences? Information security has grown to be a colossal factor, especially with modern communication networks, leaving loopholes that could be leveraged to devastating effects. This article presents a discussion on two popular encryption schemes that can be used to tighten communication security in Symmetric and Asymmetric Encryption. In principle, the best way to commence this discussion is to start from the basics first. Thus, we look at the definitions of algorithms and key cryptographic concepts and then dive into the core part of the discussion where we present a comparison of the two techniques. An algorithm is basically a procedure or a formula for solving a data snooping problem. An encryption algorithm is a set of mathematical procedure for performing encryption on data . Through the use of such an algorithm, information is made in the cipher text and requires the use of a key to transforming the data into its original form. This brings us to the concept of cryptography that has long been used in information security in communication systems. Cryptography is a method of using advanced mathematical principles in storing and transmitting data in a particular form so that only those whom it is intended can read and process it. Encryption is a key concept in cryptography It is a process whereby a message is encoded in a format that cannot be read or understood by an eavesdropper. The technique is old and was first used by Caesar to encrypt his messages using Caesar cipher. A plain text from a user can be encrypted to a ciphertext, then send through a communication channel and no eavesdropper can interfere with the plain text. When it reach Continue reading >>

## Whats The Difference Between Symmetric And Asymmetric Encryption? What Are Some Examples?

Symmetric encryption uses only one key (Both parties share the same key). Before the communication begin both the parties must exchange the shared secret key Asymmetric encryption uses public and private key, different keys for encryption and decryption .Public key is made available to everyone and private key is kept secret Symmetric encryption takes the plaintext converts it into cipher text, receiver decrypts the cipher text using the same key Asymmetric encryption takes the plain text hashes it using Senders Private Key and the hash is converted to cipher text using Recipients Public Key, Receiver will decrypt it using Recipients Private Key and match the hash using Senders Public Key Symmetric encryption is fast but key exchange is a problem Asymmetric encryption is slow but solves the problem of key exchange Symmetric encryption are DES, 3DES, AES, IDEA, RC4 (Stream cipher), latest symmetric encryption used is AES256 as breaking that key is impossible by todays computing capability Asymmetric encryption are RSA, ElGamal, ECC, Diffie - Hellman (Widely used only in key exchange) and DSA Example: In case of VPN if you are trying to connect, the connection is established using Asymmetric encryption as it solves the problem of key exchange, but the data is transferred using Symmetric encryption as it is fast Continue reading >>

## Symmetric And Asymmetric Key Encryption: Forming A Mental Model

FREE REGISTRATION Already a Member Login Here Symmetric and Asymmetric Key Encryption: Forming a Mental Model When being introduced to cryptography, an admittedly daunting subject, its best to start at the most common subjects first at a very high level and then go deeper once that view is understood; the nitty-gritty of the mathematics behind the crypto can wait. One of the best ways to learn anything new is by using mental models, which is to learn a thought process of how something works, and often how a process would work in the real world. I am often asked to explain the difference between symmetric and asymmetric encryption after people continually confuse the two. So, the purpose of this writing is to provide a very high-level, easy-to-understand mental model of symmetric encryption, asymmetric encryption, and digital signatures, which together make up some of the very basic basics of cryptography. Starting off, well create a scenario. Consider that two people, Alice and Bob, are very close friends (or perhaps more who knows?) They also work in the same officeand talk to each other via their work computers during the workday. A third office worker, Eve, is either annoyed or jealous at their relationship and tries to intercept and read messages sent between Alice and Bob. Both Alice and Bob know that Eve is tech-savvy and somewhat malicious towards their relationship. Even though Alice and Bob have nothing to hide, the idea of Eve intercepting and reading their messages creeps them out, so they want to make themselves less vulnerable to such behavior. How would they go about this? The answer (or one of many answers) is encryption, and they want to use either symmetric or asymmetric encryption to protect their messages. Symmetric Encryption: Shared Secret (Same Ke Continue reading >>

## Security - Difference Between Asymmetric And Symmetric Encryption Methods? - Stack Overflow

Difference between asymmetric and symmetric encryption methods? OK I'm confused as how these two encryption methods work. I know that symmetric is conventional, and uses a shared private key between two users. This is a bit broad as a question, you'd be better served by reading a book on the subject, e.g. cacr.math.uwaterloo.ca/hac because this is really a broad subject for which an "executive summary" don't work well as the devil really hides in the details... Bruno Rohe Mar 29 '11 at 21:46 I suggest starting with Applied Cryptography . It's an excellent introduction to the principles involved in cryptography. If you're seriously interested in cryptography, I strongly recommend the Handbook of Applied Cryptography as an amazing reference work. It will be too much to handle at first, but it is free, so go grab a copy now :) and when you're done with AC, read HAC. (Actually, the hardback edition is very well made and far easier to read than a few hundred pages of laser-printed paper; consider buying it if you like the looks of the PDFs.) Symmetric encryption works by mixing secret input with a secret key in such a fashion that it is (a) fast (b) cannot derive the input or key from the output. The details of the mixing varies significantly, but there are block ciphers and stream ciphers ; block ciphers work by looking at the input data in 8 or 16 or 32 byte blocks at a time, and diffusing the input and key within those blocks. Different modes of operation are needed to encrypt more data than fits in the blocks, and different modes of operation might or might not spread data between blocks too. Symmetric ciphers are fantastic for bulk data encryption, from 8 bytes to 8 terabytes, it's the best choice for encrypting data. Asymmetric encryption works by exploiting very diff Continue reading >>

## Symmetric Vs Asymmetric Encryption

Overview: Symmetric vs. Asymmetric Encryption Secure file transfer protocols generally employ a combination of symmetric and asymmetric encryption to preserve the confidentiality of data while in transit. So why the need for two kinds of encryption? What is the difference between symmetric and asymmetric? In this post, we take a closer look at the main functions of symmetric and asymmetric encryption, their strengths, their weaknesses, and why we'd prefer having both. Symmetric key encryption is a type of encryption that makes use of a single key for both the encryption and decryption process. Some of the encryption algorithms that use symmetric keys include: AES (Advanced Encryption Standard), Blowfish, DES (Data Encryption Standard), Triple DES, Serpent, and Twofish. If you want to apply symmetric key encryption to a file transfer environment, both the sender and receiver should have a copy of the same key. The sender will use his copy of the key for encrypting the file, while the receiver will use his copy for decrypting it. So if you manage a secure file transfer server that only supports symmetric encryption and one of your users wants to encrypt a file first before uploading it, one of you (either the user or you, the server admin) should first generate a key and then send the other person a copy of that key. Asymmetric key encryption, on the other hand, makes use of two keys. A private key and a public key. The public key is used for encrypting, while the private key is used for decrypting. Two of the most widely used asymmetric key algorithms are: RSA and DSA . If you're going to use asymmetric key encryption in a file transfer environment, the sender would need to hold the public key, while the receiver would need to hold the corresponding private key. So, goi Continue reading >>

## Difference Between Symmetric-key Cryptography And Asymmetric-key Cryptography.

It only needs one key to encrypt and decrypt the message. Both user should agree or exchange the same key. Two different keys required :- public key and private key. Everyone can see the public key and only the one who has private key can decode the message. How to crack a cipher text encrypted with each algorithm in each technique In this system, only one key is needed, in order to decode the message, you only need the key. Or you can identify the pattern how they the encryption is done. E.g : the encoded message is jgnnq and you can probably guess that the real message is hello by moving each letter to the prior letter. (Probably need to try out every single possiblilty.) It is like double encryption. First, the user use receivers public key to encrypt the message, although everyone knows and can see the message, only the person with his own private key can decode the message. So,To decode the system or message, the persons private key is needed, or need to identify how the private key is created. It is almost impossible to crack the system because the size of the key is too big. To confirm a senders identity in each technique. This technique confirms senders identity by finding who can encrypt the message or decode the message. This technique confirms the senders identity by the encryption. One person encrypt the message with his private key, and send that with public key (Digital Signature). The strengths and weaknesses of each techniques Safer (ample of probability), and faster. Allow letting other people read the encrypted message. No problem of Key distribution. Continue reading >>

## What Is The Difference Between Symmetric And Asymmetric Cryptography ?

What is the difference between symmetric and asymmetric cryptography ? by Zafar Uddin , Senior Network Security Engineer, FCm Travel solution India PVT Ltd. - 2 years ago Symmetric Encryption is a process of converting Readable data (Clear-Text or Plain-Text) to Cipher-Text (Unreadable format) and converting it back to Clear-Text using same key and with Asymmetric you require both side different keys. Can't find the answers you're looking for? Ask your own questions, and get answers from specialists on Bayt.com Enter your contact details to send you the answer or log in by Narn Khayadi , ICT Support, Stima Sacco - 2 years ago Asymmetric encryption, also known as public-key encryption, utilizes a pair of keys; a public key and a private key. If you encrypt data with the public key, only the holder of the corresponding private key can decrypt the data, hence ensuring confidentiality whileSymmetric encryption, means that the encryption and decryption operations utilize the same key This field must contain at least 15 characters. This field must contain 150 characters or less. Please make sure that your answer is written in the same language as the question. Thank you for answering the question. Unfortunately, the answer you are trying to submit has already been added. You can't add content on Bayt.com Specialties because your account has been blocked for violating the terms of service. You can't add content on Bayt.com Specialties because you don't have a rank yet or your email hasn't been verified. Answer should contain a minimum of 25 characters. Continue reading >>

## Differences Between Hash Functions, Symmetric & Asymmetric Algorithms

Differences between Hash functions, Symmetric & Asymmetric Algorithms Cryptographic algorithms can be categorized into three classes:Hash functions, Symmetric and Asymmetric algorithms. This article sheds light on their differences, purpose and main fields of application. A lot of security services such as confidentiality, integrity, authentication, and non-repudiation can be provided by using cryptographic algorithms. Confidentiality serves the purpose that information is not revealed to unauthorized entities. Confidentiality is accomplished by transforming the understandable information to a state that is unintelligible except by authorized entities. This transformation mechanism is called encryption. Decryption of unintelligible data is performed to restore it to its original state. Both symmetric and asymmetric algorithms can provide encryption. Confidentiality is not only important for data at rest but also for the network communication data. Integrity is a mechanism that assures that the data has not been altered in an unapproved way. The integrity of data is maintained at the creation, transmission and storage phases. Alteration of data includes insertion, deletion and substitution breaches. Digital signatures and message authentication codes (MAC) are the cryptographic mechanisms which can be used to notice both intentional & accidental alterations. There are 2 types of authentication services which can be achieved using cryptography i.e. Source and Integrity authentication. Source authentication assures identity of the entity that originally generated/crafted the information. Integrity authentication validates that data has not been modified and the integrity of data is protected. Non-repudiation is the guarantee that no one can deny a transaction. The termino Continue reading >>

## Symmetric Vs. Asymmetric Encryption Whats The Difference?

Symmetric Encryption also called as Secret Key Cryptography, it employs the same secret key for both encryption and decryption, that is used to exchange information during a secure session between clients browser and web server with an SSL Certificate. This is a type of encryption whose technique allows the application of only one key for both encryption and decryption of a message that is being shared through a communication channel. Also known as the conventional encryption method, Symmetric encryption happens to be the oldest known method of encryption with the Caesar cipher falling in this category. In this method, the plain text gets encrypted and then converted to the cipher text using an encryption algorithm and a key. On reaching the intended receiver, the ciphertext gets converted back to plain text utilizing the same key that was applied for encryption, and a decryption algorithm. The key used can be as easy as a secret number or just a string of letters. We can use a shift cipher, which is a simple Symmetric Encryption technique, to demonstrate this. If your plain-text is, COME TOMORROW and your secret key is to shift each letter by three positions, then for instance letter C in the text becomes letter F in the cipher-text. This is precisely what is referred to as the Caesar cipher. Your plain text above will, therefore, look like FRPH VRPRUURZ after encryption. At first glance, the cipher message will be incomprehensible to any eavesdropper. However, once it is decoded using the secret key, it reverts to plain text once more. Examples of modern Symmetric key encryption algorithms include block ciphers such as Blowfish, AES, DES, Camellia, and Serpent, or stream ciphers such as FISH, RC4, QUAD, Py, and SNOW. Asymmetric Encryption also called as Public Key Cr Continue reading >>

## Symmetric And Asymmetric Encryption - The Difference Explained

Symmetric and Asymmetric Encryption - The Difference Explained SSL Certificates & Web Security Specialist at RapidSSLOnline | Owner of SSL Certificates Education Group RapidSSLonline brings you the technical comparative breakdown of the two encryption methods Day after day, the tally of data breaches and data-tampering incidents keeps reaching new heights. This is because cyber attackers keep evolving by finding new, delicate techniques to victimize online users. In order to counteract such attempts, safeguarding information has become an indispensable measure in todays cyber security world. Encryption is one such method to protect discreet information being transferred online. The Encryption technique is employed in two ways, namelySymmetric EncryptionandAsymmetric Encryption. Before getting to the difference between Symmetric and Asymmetric encryption, lets clear a few concepts first. Symmetric encryption is a conventional method of Encryption. It is also the simplest of two techniques. Symmetric encryption is executed by means of only one secret key known as Symmetric Key that is possessed by both parties. This key is applied to encode and decode the information. The sender uses this key before sending the message and the receiver uses it to decipher the encoded message. Asymmetric Encryption is a relatively new and complex mode of Encryption. Complex because it incorporates two cryptographic keys to implement data security. These keys are called a Public Key and a Private Key. The Public key, as the name suggests, is available to everyone who wishes to send a message. On the other hand, the private key is kept at a secure place by the owner of the public key. The involvement of two keys makes Asymmetric Encryption a complex technique. Thus, it proves to be a massiv Continue reading >>

## Description Of Symmetric And Asymmetric Encryption

Description of Symmetric and Asymmetric Encryption There are two basic techniques for encrypting information: symmetric encryption (also called secret key encryption) and asymmetric encryption (also called public key encryption.) Symmetric encryption is the oldest and best-known technique. A secret key, which can be a number, a word, or just a string of random letters, is applied to the text of a message to change the content in a particular way. This might be as simple as shifting each letter by a number of places in the alphabet. As long as both sender and recipient know the secret key, they can encrypt and decrypt all messages that use this key. The problem with secret keys is exchanging them over the Internet or a large network while preventing them from falling into the wrong hands. Anyone who knows the secret key can decrypt the message. One answer is asymmetric encryption, in which there are two related keys--a key pair. A public key is made freely available to anyone who might want to send you a message. A second, private key is kept secret, so that only you know it. Any message (text, binary files, or documents) that are encrypted by using the public key can only be decrypted by applying the same algorithm, but by using the matching private key. Any message that is encrypted by using the private key can only be decrypted by using the matching public key. This means that you do not have to worry about passing public keys over the Internet (the keys are supposed to be public). A problem with asymmetric encryption, however, is that it is slower than symmetric encryption. It requires far more processing power to both encrypt and decrypt the content of the message. To use asymmetric encryption, there must be a way for people to discover other public keys. The typic Continue reading >>

## A Comparison Between Symmetric And Asymmetric Key Encryption Algorithm Based Decryption Mixnets

A comparison between symmetric and asymmetric key encryption algorithm based decryption mixnets Abstract: This paper presents a comparison between symmetric and asymmetric key encryption algorithm based decryption mixnets through simulation. Mix-servers involved in a decryption mixnet receive independently and repeatedly encrypted messages as their input, then successively decrypt and shuffle them to generate a new altered output from which finally the messages are regained. Thus mixnets confirm unlinkability and anonymity between senders and the receiver of messages. Both symmetric (e.g. onetime pad, AES) and asymmetric (e.g. RSA and ElGamal cryptosystems) key encryption algorithms can be exploited to accomplish decryption mixnets. This paper evaluates both symmetric (e.g. ESEBM: enhanced symmetric key encryption based mixnet) and asymmetric (e.g. RSA and ElGamal based) key encryption algorithm based decryption mixnets. Here they are evaluated based on several criteria such as: the number of messages traversing through the mixnet, the number of mix-servers involved in the mixnet and the key length of the underlying cryptosystem. Finally mixnets are compared on the basis of the computation time requirement for the above mentioned criteria while sending messages anonymously. Continue reading >>