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Which statement is incorrect symmetric encryption is faster than asymmetric encryption? Nội dung chính Show
    Description[edit]Applications[edit]Hybrid cryptosystems[edit]Weaknesses[edit]Algorithms[edit]Alteration of public keys[edit]Public key infrastructure[edit]Examples[edit]History[edit]Anticipation[edit]Classified discovery[edit]Public discovery[edit]See also[edit]Notes[edit]References[edit]External links[edit]Which is faster symmetric encryption or asymmetric encryption?Why is asymmetric encryption slower than symmetric encryption?Which of the following is the correct statement about symmetric encryption?Which type of encryption is faster a asymmetric B symmetric?

An unpredictable (typically large and random) number is used to begin generation of an acceptable pair of keys suitable for use by an asymmetric key algorithm.

Which statement is incorrect symmetric encryption is faster than asymmetric encryption?

In an asymmetric key encryption scheme, anyone can encrypt messages using a public key, but only the holder of the paired private key can decrypt such a message. The security of the system depends on the secrecy of the private key, which must not become known to any other.

Which statement is incorrect symmetric encryption is faster than asymmetric encryption?

In the Diffie–Hellman key exchange scheme, each party generates a public/private key pair and distributes the public key of the pair. After obtaining an authentic (n.b., this is critical) copy of each other's public keys, Alice and Bob can compute a shared secret offline. The shared secret can be used, for instance, as the key for a symmetric cipher which will be, in essentially all cases, much faster.

Which statement is incorrect symmetric encryption is faster than asymmetric encryption?

In this example the message is digitally signed with Alice's private key, but the message itself is not encrypted. 1) Alice signs a message with her private key. 2) Using Alice's public key, Bob can verify that Alice sent the message and that the message has not been modified.

Public-key cryptography, or asymmetric cryptography, is the field of cryptographic systems that use pairs of related keys. Each key pair consists of a public key and a corresponding private key.[1][2] Key pairs are generated with cryptographic algorithms based on mathematical problems termed one-way functions. Security of public-key cryptography depends on keeping the private key secret; the public key can be openly distributed without compromising security.[3]

In a public-key encryption system, anyone with a public key can encrypt a message, yielding a ciphertext, but only those who know the corresponding private key can decrypt the ciphertext to obtain the original message.[4]

For example, a journalist can publish the public key of an encryption key pair on a web site so that sources can send secret messages to them in ciphertext. Only the journalist who knows the corresponding private key can decrypt the ciphertexts to obtain the sources' messages—an eavesdropper reading email on its way to the journalist can't decrypt the ciphertexts. However, public-key encryption doesn't conceal metadata like what computer a source used to send a message, when they sent it, or how long it is. Public-key encryption on its own also doesn't tell the recipient anything about who sent a message—it just conceals the content of a message in a ciphertext that can only be decrypted with the private key.

In a digital signature system, a sender can use a private key together with a message to create a signature. Anyone with the corresponding public key can verify whether the signature matches the message, but a forger who doesn't know the private key can't find any message/signature pair that will pass verification with the public key.[5][6]

For example, a software publisher can create a signature key pair and include the public key in software installed on computers. Later, the publisher can distribute an update to the software signed using the private key, and any computer receiving an update can confirm it is genuine by verifying the signature using the public key. As long as the software publisher keeps the private key secret, even if a forger can distribute malicious updates to computers, they can't convince the computers that any malicious updates are genuine.

Public key algorithms are fundamental security primitives in modern cryptosystems, including applications and protocols which offer assurance of the confidentiality, authenticity and non-repudiability of electronic communications and data storage. They underpin numerous Internet standards, such as Transport Layer Security (TLS), SSH, S/MIME and PGP. Some public key algorithms provide key distribution and secrecy (e.g., Diffie–Hellman key exchange), some provide digital signatures (e.g., Digital Signature Algorithm), and some provide both (e.g., RSA). Compared to symmetric encryption, asymmetric encryption is rather slower than good symmetric encryption, too slow for many purposes.[7] Today's cryptosystems (such as TLS, Secure Shell) use both symmetric encryption and asymmetric encryption, often by using asymmetric encryption to securely exchange a secret key which is then used for symmetric encryption.

Description[edit]

Before the mid-1970s, all cipher systems used symmetric key algorithms, in which the same cryptographic key is used with the underlying algorithm by both the sender and the recipient, who must both keep it secret. Of necessity, the key in every such system had to be exchanged between the communicating parties in some secure way prior to any use of the system – for instance, via a secure channel. This requirement is never trivial and very rapidly becomes unmanageable as the number of participants increases, or when secure channels aren't available, or when, (as is sensible cryptographic practice), keys are frequently changed. In particular, if messages are meant to be secure from other users, a separate key is required for each possible pair of users.

By contrast, in a public key system, the public keys can be disseminated widely and openly, and only the corresponding private keys need be kept secret by its owner.

Two of the best-known uses of public key cryptography are:

    Public key encryption, in which a message is encrypted with the intended recipient's public key. For properly chosen and used algorithms, messages cannot in practice be decrypted by anyone who does not possess the matching private key, who is thus presumed to be the owner of that key and so the person associated with the public key. This can be used to ensure confidentiality of a message.[8]Digital signatures, in which a message is signed with the sender's private key and can be verified by anyone who has access to the sender's public key. This verification proves that the sender had access to the private key, and therefore is very likely to be the person associated with the public key. It also proves that the signature was prepared for that exact message, since verification will fail for any other message one could devise without using the private key.

One important issue is confidence/proof that a particular public key is authentic, i.e. that it is correct and belongs to the person or entity claimed, and has not been tampered with or replaced by some (perhaps malicious) third party. There are several possible approaches, including:

A public key infrastructure (PKI), in which one or more third parties – known as certificate authorities – certify ownership of key pairs. TLS relies upon this. This implies that the PKI system (software, hardware, and management) is trust-able by all involved.

A "web of trust" which decentralizes authentication by using individual endorsements of links between a user and the public key belonging to that user. PGP uses this approach, in addition to lookup in the domain name system (DNS). The DKIM system for digitally signing emails also uses this approach.

Applications[edit]

The most obvious application of a public key encryption system is for encrypting communication to provide confidentiality – a message that a sender encrypts using the recipient's public key which can be decrypted only by the recipient's paired private key.

Another application in public key cryptography is the digital signature. Digital signature schemes can be used for sender authentication.

Non-repudiation systems use digital signatures to ensure that one party cannot successfully dispute its authorship of a document or communication.

Further applications built on this foundation include: digital cash, password-authenticated key agreement, time-stamping services and non-repudiation protocols.

Hybrid cryptosystems[edit]

Because asymmetric key algorithms are nearly always much more computationally intensive than symmetric ones, it is common to use a public/private asymmetric key-exchange algorithm to encrypt and exchange a symmetric key, which is then used by symmetric-key cryptography to transmit data using the now-shared symmetric key for a symmetric key encryption algorithm. PGP, SSH, and the SSL/TLS family of schemes use this procedure; they are thus called hybrid cryptosystems. The initial asymmetric cryptography-based key exchange to share a server-generated symmetric key from the server to client has the advantage of not requiring that a symmetric key be pre-shared manually, such as on printed paper or discs transported by a courier, while providing the higher data throughput of symmetric key cryptography over asymmetric key cryptography for the remainder of the shared connection.

Weaknesses[edit]

As with all security-related systems, it is important to identify potential weaknesses. Aside from poor choice of an asymmetric key algorithm (there are few which are widely regarded as satisfactory) or too short a key length, the chief security risk is that the private key of a pair becomes known. All security of messages, authentication, etc., will then be lost.

Algorithms[edit]

All public key schemes are in theory susceptible to a "brute-force key search attack".[9] However, such an attack is impractical if the amount of computation needed to succeed – termed the "work factor" by Claude Shannon – is out of reach of all potential attackers. In many cases, the work factor can be increased by simply choosing a longer key. But other algorithms may inherently have much lower work factors, making resistance to a brute-force attack (e.g., from longer keys) irrelevant. Some special and specific algorithms have been developed to aid in attacking some public key encryption algorithms; both RSA and ElGamal encryption have known attacks that are much faster than the brute-force approach.[10] None of these are sufficiently improved to be actually practical, however.

Major weaknesses have been found for several formerly promising asymmetric key algorithms. The "knapsack packing" algorithm was found to be insecure after the development of a new attack.[11] As with all cryptographic functions, public-key implementations may be vulnerable to side-channel attacks that exploit information leakage to simplify the search for a secret key. These are often independent of the algorithm being used. Research is underway to both discover, and to protect against, new attacks.

Alteration of public keys[edit]

Another potential security vulnerability in using asymmetric keys is the possibility of a "man-in-the-middle" attack, in which the communication of public keys is intercepted by a third party (the "man in the middle") and then modified to provide different public keys instead. Encrypted messages and responses must, in all instances, be intercepted, decrypted, and re-encrypted by the attacker using the correct public keys for the different communication segments so as to avoid suspicion.

A communication is said to be insecure where data is transmitted in a manner that allows for interception (also called "sniffing"). These terms refer to reading the sender's private data in its entirety. A communication is particularly unsafe when interceptions can't be prevented or monitored by the sender.[12]

A man-in-the-middle attack can be difficult to implement due to the complexities of modern security protocols. However, the task becomes simpler when a sender is using insecure truyền thông such as public networks, the Internet, or wireless communication. In these cases an attacker can compromise the communications infrastructure rather than the data itself. A hypothetical malicious staff thành viên an Internet Service Provider (ISP) might find a man-in-the-middle attack relatively straightforward. Capturing the public key would only require searching for the key as it gets sent through the ISP's communications hardware; in properly implemented asymmetric key schemes, this is not a significant risk.

In some advanced man-in-the-middle attacks, one side of the communication will see the original data while the other will receive a malicious variant. Asymmetric man-in-the-middle attacks can prevent users from realizing their connection is compromised. This remains so even when one user's data is known to be compromised because the data appears fine to the other user. This can lead to confusing disagreements between users such as "it must be on your end!" when neither user is fault. Hence, man-in-the-middle attacks are only fully preventable when the communications infrastructure is physically controlled by one or both parties; such as via a wired route inside the sender's own building. In summation, public keys are easier to alter when the communications hardware used by a sender is controlled by an attacker.[13][14][15]

Public key infrastructure[edit]

One approach to prevent such attacks involves the use of a public key infrastructure (PKI); a set of roles, policies, and procedures needed to create, manage, distribute, use, store and revoke digital certificates and manage public-key encryption. However, this has potential weaknesses.

For example, the certificate authority issuing the certificate must be trusted by all participating parties to have properly checked the identity of the key-holder, to have ensured the correctness of the public key when it issues a certificate, to be secure from computer piracy, and to have made arrangements with all participants to check all their certificates before protected communications can begin. Web browsers, for instance, are supplied with a long list of "self-signed identity certificates" from PKI providers – these are used to check the bona fides of the certificate authority and then, in a second step, the certificates of potential communicators. An attacker who could subvert one of those certificate authorities into issuing a certificate for a bogus public key could then mount a "man-in-the-middle" attack as easily as if the certificate scheme were not used all. In an alternative scenario rarely discussed,[citation needed] an attacker who penetrates an authority's servers and obtains its store of certificates and keys (public and private) would be able to spoof, masquerade, decrypt, and forge transactions without limit.

Despite its theoretical and potential problems, this approach is widely used. Examples include TLS and its predecessor SSL, which are commonly used to provide security for web browser transactions (for example, to securely send credit card details to an online store).

Aside from the resistance to attack of a particular key pair, the security of the certification hierarchy must be considered when deploying public key systems. Some certificate authority – usually a purpose-built program running on a server computer – vouches for the identities assigned to specific private keys by producing a digital certificate. Public key digital certificates are typically valid for several years a time, so the associated private keys must be held securely over that time. When a private key used for certificate creation higher in the PKI server hierarchy is compromised, or accidentally disclosed, then a "man-in-the-middle attack" is possible, making any subordinate certificate wholly insecure.

Examples[edit]

Examples of well-regarded asymmetric key techniques for varied purposes include:

    Diffie–Hellman key exchange protocolDSS (Digital Signature Standard), which incorporates the Digital Signature AlgorithmElGamalElliptic-curve cryptography
      Elliptic Curve Digital Signature Algorithm (ECDSA)Elliptic-curve Diffie–Hellman (ECDH)Ed25519 and Ed448 (EdDSA)X25519 and X448 (ECDH/EdDH)
    Various password-authenticated key agreement techniquesPaillier cryptosystemRSA encryption algorithm (PKCS#1)Cramer–Shoup cryptosystemYAK authenticated key agreement protocol

Examples of asymmetric key algorithms not yet widely adopted include:

    NTRUEncrypt cryptosystemKyberMcEliece cryptosystem

Examples of notable – yet insecure – asymmetric key algorithms include:

    Merkle–Hellman knapsack cryptosystem

Examples of protocols using asymmetric key algorithms include:

    S/MIMEGPG, an implementation of OpenPGP, and an Internet StandardEMV, EMV Certificate AuthorityIPsecPGPZRTP, a secure VoIP protocolTransport Layer Security standardized by IETF and its predecessor Secure Socket LayerSILCSSHBitcoinOff-the-Record Messaging

History[edit]

During the early history of cryptography, two parties would rely upon a key that they would exchange by means of a secure, but non-cryptographic, method such as a face-to-face meeting, or a trusted courier. This key, which both parties must then keep absolutely secret, could then be used to exchange encrypted messages. A number of significant practical difficulties arise with this approach to distributing keys.

Anticipation[edit]

In his 1874 book The Principles of Science, William Stanley Jevons[16] wrote:

Can the reader say what two numbers multiplied together will produce the number 8616460799?[17] I think it unlikely that anyone but myself will ever know.[18]

Here he described the relationship of one-way functions to cryptography, and went on to discuss specifically the factorization problem used to create a trapdoor function. In July 1996, mathematician Solomon W. Golomb said: "Jevons anticipated a key feature of the RSA Algorithm for public key cryptography, although he certainly did not invent the concept of public key cryptography."[19]

Classified discovery[edit]

In 1970, James H. Ellis, a British cryptographer the UK Government Communications Headquarters (GCHQ), conceived of the possibility of "non-secret encryption", (now called public key cryptography), but could see no way to implement it.[20][21] In 1973, his colleague Clifford Cocks implemented what has become known as the RSA encryption algorithm, giving a practical method of "non-secret encryption", and in 1974 another GCHQ mathematician and cryptographer, Malcolm J. Williamson, developed what is now known as Diffie–Hellman key exchange. The scheme was also passed to the USA's National Security Agency.[22] Both organisations had a military focus and only limited computing power was available in any case; the potential of public key cryptography remained unrealised by either organization:

I judged it most important for military use ... if you can share your key rapidly and electronically, you have a major advantage over your opponent. Only the end of the evolution from Berners-Lee designing an open internet architecture for CERN, its adaptation and adoption for the Arpanet ... did public key cryptography realise its full potential.

—Ralph Benjamin[22]

These discoveries were not publicly acknowledged for 27 years, until the research was declassified by the British government in 1997.[23]

Public discovery[edit]

In 1976, an asymmetric key cryptosystem was published by Whitfield Diffie and Martin Hellman who, influenced by Ralph Merkle's work on public key distribution, disclosed a method of public key agreement. This method of key exchange, which uses exponentiation in a finite field, came to be known as Diffie–Hellman key exchange.[24] This was the first published practical method for establishing a shared secret-key over an authenticated (but not confidential) communications channel without using a prior shared secret. Merkle's "public key-agreement technique" became known as Merkle's Puzzles, and was invented in 1974 and only published in 1978. This makes asymmetric encryption a rather new field in cryptography although cryptography itself dates back more than 2,000 years.[25]

In 1977, a generalization of Cocks' scheme was independently invented by Ron Rivest, Adi Shamir and Leonard Adleman, all then MIT. The latter authors published their work in 1978 in Martin Gardner's Scientific American column, and the algorithm came to be known as RSA, from their initials.[26] RSA uses exponentiation modulo a product of two very large primes, to encrypt and decrypt, performing both public key encryption and public key digital signatures. Its security is connected to the extreme difficulty of factoring large integers, a problem for which there is no known efficient general technique (though prime factorization may be obtained through brute-force attacks; this grows much more difficult the larger the prime factors are). A description of the algorithm was published in the Mathematical Games column in the August 1977 issue of Scientific American.[27]

Since the 1970s, a large number and variety of encryption, digital signature, key agreement, and other techniques have been developed, including the Rabin cryptosystem, ElGamal encryption, DSA - and elliptic curve cryptography.

See also[edit]

    Books on cryptographyGNU Privacy GuardIdentity-based encryption (IBE)Key escrowKey-agreement protocolPGP word listPost-quantum cryptographyPretty Good PrivacyPseudonymPublic key fingerprintPublic key infrastructure (PKI)Quantum computingQuantum cryptographySecure Shell (SSH)Symmetric-key algorithmThreshold cryptosystemWeb of trust

Notes[edit]

^ R. Shirey (August 2007). Internet Security Glossary, Version 2. Network Working Group. doi:10.17487/RFC4949. RFC 4949. Informational.^ Bernstein, Daniel J.; Lange, Tanja (14 September 2022). "Post-quantum cryptography". Nature. 549 (7671): 188–194. doi:10.1038/nature23461. ISSN 0028-0836. ^ Stallings, William (3 May 1990). Cryptography and Network Security: Principles and Practice. Prentice Hall. p. 165. ISBN 9780138690175. ^ Menezes, Alfred J.; van Oorschot, Paul C.; Vanstone, Scott A. (October 1996). "8: Public-key encryption". Handbook of Applied Cryptography (PDF). CRC Press. pp. 283–319. ISBN 0-8493-8523-7. Retrieved 8 October 2022. ^ Menezes, Alfred J.; van Oorschot, Paul C.; Vanstone, Scott A. (October 1996). "8: Public-key encryption". Handbook of Applied Cryptography (PDF). CRC Press. pp. 425–488. ISBN 0-8493-8523-7. Retrieved 8 October 2022. ^ Bernstein, Daniel J. (1 May 2008). "Protecting communications against forgery". Algorithmic Number Theory (PDF). Vol. 44. MSRI Publications. §5: Public-key signatures, pp. 543-545. Retrieved 8 October 2022. ^ Alvarez, Rafael; Caballero-Gil, Cándido; Santonja, Juan; Zamora, Antonio (27 June 2022). "Algorithms for Lightweight Key Exchange". Sensors. 17 (7): 1517. doi:10.3390/s17071517. ISSN 1424-8220. PMC 5551094. PMID 28654006. ^ "Asymmetric encryption". IONOS Digitalguide. Retrieved 2 June 2022.^ Paar, Christof; Pelzl, Jan; Preneel, Bart (2010). Understanding Cryptography: A Textbook for Students and Practitioners. Springer. ISBN 978-3-642-04100-6. ^ Mavroeidis, Vasileios, and Kamer Vishi, "The Impact of Quantum Computing on Present Cryptography", International Journal of Advanced Computer Science and Applications, 31 March 2022^ Shamir, Adi (November 1982). "A polynomial time algorithm for breaking the basic Merkle-Hellman cryptosystem". 23rd Annual Symposium on Foundations of Computer Science (SFCS 1982): 145–152. doi:10.1109/SFCS.1982.5. ^ Tunggal, Abi (20 February 2022). "What Is a Man-in-the-Middle Attack and How Can It Be Prevented - What is the difference between a man-in-the-middle attack and sniffing?". UpGuard. Retrieved 26 June 2022. ^ Tunggal, Abi (20 February 2022). "What Is a Man-in-the-Middle Attack and How Can It Be Prevented - Where do man-in-the-middle attacks happen?". UpGuard. Retrieved 26 June 2022.^ martin (30 January 2013). "China, GitHub and the man-in-the-middle". GreatFire. Archived from the original on 19 August 2022. Retrieved 27 June 2015.^ percy (4 September 2014). "Authorities launch man-in-the-middle attack on Google". GreatFire. Retrieved 26 June 2022.^ Jevons, William Stanley, The Principles of Science: A Treatise on Logic and Scientific Method p. 141, Macmillan & Co., London, 1874, 2nd ed. 1877, 3rd ed. 1879. Reprinted with a foreword by Ernst Nagel, Dover Publications, Tp New York, NY, 1958.^ This came to be known as "Jevons's number". The only nontrivial factor pair is 89681 × 96079.^ Principles of Science, Macmillan & Co., 1874, p. 141.^ Golob, Solomon W. (1996). "On Factoring Jevons' Number". Cryptologia. 20 (3): 243. doi:10.1080/0161-119691884933. S2CID 205488749. ^ Ellis, James H. (January 1970). "THE POSSIBILITY OF SECURE NON-SECRET DIGITAL ENCRYPTION" (PDF).^ Sawer, Patrick (11 March 2022). "The unsung genius who secured Britain's computer defences and paved the way for safe online shopping". The Telegraph. ^ a b Espiner, Tom (26 October 2010). "GCHQ pioneers on birth of public key crypto". www.zdnet.com.^ Singh, Simon (1999). The Code Book. Doubleday. pp. 279–292.^ Diffie, Whitfield; Hellman, Martin E. (November 1976). "New Directions in Cryptography" (PDF). IEEE Transactions on Information Theory. 22 (6): 644–654. CiteSeerX 10.1.1.37.9720. doi:10.1109/TIT.1976.1055638. Archived (PDF) from the original on 29 November 2014. ^ "Asymmetric encryption". IONOS Digitalguide. Retrieved 9 June 2022.^ Rivest, R.; Shamir, A.; Adleman, L. (February 1978). "A Method for Obtaining Digital Signatures and Public-Key Cryptosystems" (PDF). Communications of the ACM. 21 (2): 120–126. CiteSeerX 10.1.1.607.2677. doi:10.1145/359340.359342. S2CID 2873616. ^ Robinson, Sara (June 2003). "Still Guarding Secrets after Years of Attacks, RSA Earns Accolades for its Founders" (PDF). SIAM News. 36 (5).

References[edit]

    Hirsch, Frederick J. "SSL/TLS Strong Encryption: An Introduction". Apache HTTP Server. Retrieved 17 April 2013.cite web: CS1 maint: url-status (link). The first two sections contain a very good introduction to public-key cryptography.Ferguson, Niels; Schneier, Bruce (2003). Practical Cryptography. Wiley. ISBN 0-471-22357-3.Katz, Jon; Lindell, Y. (2007). Introduction to Modern Cryptography. CRC Press. ISBN 978-1-58488-551-1. Menezes, A. J.; van Oorschot, P. C.; Vanstone, Scott A. (1997). Handbook of Applied Cryptography. ISBN 0-8493-8523-7. IEEE 1363: Standard Specifications for Public-Key CryptographyChristof Paar, Jan Pelzl, "Introduction to Public-Key Cryptography", Chapter 6 of "Understanding Cryptography, A Textbook for Students and Practitioners". (companion web site contains online cryptography course that covers public-key cryptography), Springer, 2009.
    Salomaa, Arto (1996). Public-Key Cryptography (2 ed.). Berlin: Springer. 275. doi:10.1007/978-3-662-03269-5. ISBN 978-3-662-03269-5. S2CID 24751345.
    Oral history interview with Martin Hellman, Charles Babbage Institute, University of Minnesota. Leading cryptography scholar Martin Hellman discusses the circumstances and fundamental insights of his invention of public key cryptography with collaborators Whitfield Diffie and Ralph Merkle Stanford University in the mid-1970s.An account of how GCHQ kept their invention of PKE secret until 1997

Which is faster symmetric encryption or asymmetric encryption?

Asymmetric Key Encryption: Asymmetric Key Encryption is based on public and private key encryption techniques. It uses two different key to encrypt and decrypt the message. It is more secure than the symmetric key encryption technique but is much slower.

Why is asymmetric encryption slower than symmetric encryption?

Asymmetric encryption is slower than symmetric encryption because it employs two separate keys that are linked through a difficult mathematical procedure. Symmetric encryption is mostly used to transfer large amounts of data.

Which of the following is the correct statement about symmetric encryption?

Answer 2 is correct. As there is only one key in the symmetrical encryption, this must be known by both sender and recipient and this key is sufficent to decrypt the secret message.

Which type of encryption is faster a asymmetric B symmetric?

Asymmetric encryption is the more secure one, while symmetric encryption is faster. They're both very effective in different ways and, depending on the task hand, either or both may be deployed alone or together. Only one key (symmetric key) is used, and the same key is used to encrypt and decrypt the message. Tải thêm tài liệu liên quan đến nội dung bài viết Which statement is incorrect symmetric encryption is faster than asymmetric encryption? Asymmetric encryption Asymmetric encryption uses

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