Share
VIDEOS 1 TO 50
What is CRYPTOGRAPHIC NONCE? What does CRYPTOGRAPHIC NONCE mean? CRYPTOGRAPHIC NONCE meaning
What is CRYPTOGRAPHIC NONCE? What does CRYPTOGRAPHIC NONCE mean? CRYPTOGRAPHIC NONCE meaning
Published: 2017/08/15
Channel: The Audiopedia
Authentication Protocol | Man In Middle Attack | Replay Attack | Nonce
Authentication Protocol | Man In Middle Attack | Replay Attack | Nonce
Published: 2015/05/04
Channel: saurabhschool
What is a Bitcoin nonce?
What is a Bitcoin nonce?
Published: 2015/02/27
Channel: Bitcoin Uncensored
Blockchain Basics Explained - Hashes with Mining and Merkle trees
Blockchain Basics Explained - Hashes with Mining and Merkle trees
Published: 2016/02/07
Channel: Chainthat
Online Authenticated Encryption and its Nonce Reuse Misuse Resistance
Online Authenticated Encryption and its Nonce Reuse Misuse Resistance
Published: 2016/01/05
Channel: TheIACR
Bitcoin Q&A: Nonces, mining, and quantum computing
Bitcoin Q&A: Nonces, mining, and quantum computing
Published: 2018/05/16
Channel: aantonop
Daniel Thompson Sullivan Nonce Explanation đŸ’©
Daniel Thompson Sullivan Nonce Explanation đŸ’©
Published: 2018/08/24
Channel: Spider Bite
THE BIGGEST NONCE ON THE PLANET
THE BIGGEST NONCE ON THE PLANET
Published: 2017/01/10
Channel: Memeulous
How Bitcoin mining actually works - What is the "cryptographic puzzle"?
How Bitcoin mining actually works - What is the "cryptographic puzzle"?
Published: 2017/02/04
Channel: Keifer Kif
Caught Local Nonce Slippling Multiple Times đŸ€§ (All Parts) #Can’tRunRoundEreB
Caught Local Nonce Slippling Multiple Times đŸ€§ (All Parts) #Can’tRunRoundEreB
Published: 2018/08/08
Channel: UKDrillLDN 4.0
North west predator hunters (nonce cornered)
North west predator hunters (nonce cornered)
Published: 2018/05/17
Channel: North West Predator Hunters
Old Hippy Nonce Caught
Old Hippy Nonce Caught
Published: 2018/05/06
Channel: Todd
Violent Nonce caught
Violent Nonce caught
Published: 2018/03/29
Channel: Todd
Andreas M. Antonopoulos|| Who generates the nonce? What makes it random?
Andreas M. Antonopoulos|| Who generates the nonce? What makes it random?
Published: 2018/05/21
Channel: Crypto's Price Forecast
Introduction to Using Nonces in WordPress
Introduction to Using Nonces in WordPress
Published: 2012/01/11
Channel: Pippin Williamson
Married nonce caught
Married nonce caught
Published: 2018/03/30
Channel: Todd
NONCE BILLY DUFFY!
NONCE BILLY DUFFY!
Published: 2017/12/14
Channel: Hard Justice
Peppa Pig The Nonce MLG
Peppa Pig The Nonce MLG
Published: 2017/02/06
Channel: danny devito
Lewis Danskin is a Nonce FT Joshy and TheBurntChip
Lewis Danskin is a Nonce FT Joshy and TheBurntChip
Published: 2018/08/03
Channel: Poal's Lunch
Nonce Busters!
Nonce Busters!
Published: 2018/01/09
Channel: Kevin Murphy II
Hysterical Nonce caught.
Hysterical Nonce caught.
Published: 2018/03/29
Channel: Todd
(NONCE) James Smith 69 from LUTON (Ex Royal Navy Officer)
(NONCE) James Smith 69 from LUTON (Ex Royal Navy Officer)
Published: 2017/09/27
Channel: Road Runner
Blockchain Primer - Merkle Tree, DAG, Consensus, Nonce, ...
Blockchain Primer - Merkle Tree, DAG, Consensus, Nonce, ...
Published: 2018/02/11
Channel: Tomer Ben David
Ninja calling Miniminter a nonce!!??
Ninja calling Miniminter a nonce!!??
Published: 2018/08/02
Channel: Roadmen On Tour
Nonce Gerard Blake Gets Busted
Nonce Gerard Blake Gets Busted
Published: 2016/02/04
Channel: SuperEarther
Nonce
Nonce
Published: 2016/05/03
Channel: douggy
DANA PART ONE THE DIRTY NONCE
DANA PART ONE THE DIRTY NONCE
Published: 2018/06/07
Channel: STINGERS PREDATOR CLOSURE NORTH WEST
Calum Lenaghan - 20s - Kilmarnock - Justice For The Innocent Scottish Division Sting
Calum Lenaghan - 20s - Kilmarnock - Justice For The Innocent Scottish Division Sting
Published: 2018/08/26
Channel: JFTI Exposure Team
Open message to nonces
Open message to nonces
Published: 2018/08/21
Channel: Prepped Nomad
INTERNETS BIGGEST NONCE!!!
INTERNETS BIGGEST NONCE!!!
Published: 2018/09/17
Channel: IamMelvs
Another Nonce Bites the Dust!!
Another Nonce Bites the Dust!!
Published: 2017/04/20
Channel: Youtube ForOneOfTheLads
Stinky Fleetwood nonce caught trying to meet an 11 year old girl for sex
Stinky Fleetwood nonce caught trying to meet an 11 year old girl for sex
Published: 2018/09/06
Channel: Nonce Hunter UK
Nonces (friends parody)
Nonces (friends parody)
Published: 2017/06/23
Channel: Luke Hopkins
Nasty Paedo Nonce gets caught in the act
Nasty Paedo Nonce gets caught in the act
Published: 2017/10/28
Channel: Karl Khan
North west predator hunters (catching a nonce)
North west predator hunters (catching a nonce)
Published: 2018/05/17
Channel: North West Predator Hunters
Rotten PAEDO NONCE caught!
Rotten PAEDO NONCE caught!
Published: 2017/12/12
Channel: Hard Justice
SAGA CONTINUES: Shanes Brannigans (NONCE HUNTING LEGEND) VENGEANCE!! WARPATH!!!
SAGA CONTINUES: Shanes Brannigans (NONCE HUNTING LEGEND) VENGEANCE!! WARPATH!!!
Published: 2018/05/06
Channel: Nuclear Soul
Brendan Fraser is a nonce
Brendan Fraser is a nonce
Published: 2018/06/17
Channel: Zesty
BIGGEST NONCE EVER
BIGGEST NONCE EVER
Published: 2018/03/13
Channel: Gravezy
Live Stream Discussing Female Armpit Hair And Nonce Pigeons
Live Stream Discussing Female Armpit Hair And Nonce Pigeons
Published: 2018/03/04
Channel: Callums Corner
Paedophile hunters sting Britain’s toughest nonce sting by kks
Paedophile hunters sting Britain’s toughest nonce sting by kks
Published: 2018/07/09
Channel: Twat apologists Exposed
(YTP) Callums Corner nonces on eddie
(YTP) Callums Corner nonces on eddie
Published: 2017/11/20
Channel: Condescender
Goblin Nonce - Giles, Crewe, caught trying to meet a 14 year old girl for sex
Goblin Nonce - Giles, Crewe, caught trying to meet a 14 year old girl for sex
Published: 2018/09/11
Channel: Nonce Hunter UK
34C3 -  KRACKing WPA2 by Forcing Nonce Reuse
34C3 - KRACKing WPA2 by Forcing Nonce Reuse
Published: 2017/12/28
Channel: media.ccc.de
Miniminter is a Big Massive Nonce (Ninja)
Miniminter is a Big Massive Nonce (Ninja)
Published: 2018/07/31
Channel: I.P.
Greg Paul is a nonce [We got him]
Greg Paul is a nonce [We got him]
Published: 2018/09/19
Channel: Beefy Reefy
(YTP) IT (GEORGIE IS A NONCE)
(YTP) IT (GEORGIE IS A NONCE)
Published: 2017/11/18
Channel: Melon Juice
Tasty Rosen/NONCE YTP
Tasty Rosen/NONCE YTP
Published: 2018/07/20
Channel: NoiceYtP
ANOTHER NONCE STING
ANOTHER NONCE STING
Published: 2017/11/23
Channel: PublicUK News
PAEDOPHILE (NONCE) CAUGHT: ISLE OF WIGHT
PAEDOPHILE (NONCE) CAUGHT: ISLE OF WIGHT
Published: 2018/04/14
Channel: Nuclear Soul
NEXT
GO TO RESULTS [51 .. 100]

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Typical client–server communication during a nonce-based authentication process including both a server nonce and a client nonce.

In cryptography, a nonce is an arbitrary number that can be used just once. It is similar in spirit to a nonce word, hence the name. It is often a random or pseudo-random number issued in an authentication protocol to ensure that old communications cannot be reused in replay attacks. They can also be useful as initialization vectors and in cryptographic hash functions. Also known as a 'Crypto Nonce'.

Definition[edit]

A nonce is an arbitrary number used only once in a cryptographic communication, in the spirit of a nonce word. They are often random or pseudo-random numbers. Many nonces also include a timestamp to ensure exact timeliness, though this requires clock synchronization between organizations. The addition of a client nonce ("cnonce") helps to improve the security in some ways as implemented in digest access authentication. To ensure that a nonce is used only once, it should be time-variant (including a suitably fine-grained timestamp in its value), or generated with enough random bits to ensure a probabilistically insignificant chance of repeating a previously generated value. Some authors define pseudo-randomness (or unpredictability) as a requirement for a nonce.[1]

Usage[edit]

Authentication[edit]

Authentication protocols may use nonces to ensure that old communications cannot be reused in replay attacks. For instance, nonces are used in HTTP digest access authentication to calculate an MD5 digest of the password. The nonces are different each time the 401 authentication challenge response code is presented, thus making replay attacks virtually impossible. The scenario of ordering products over the Internet can provide an example of the usefulness of nonces in replay attacks. An attacker could take the encrypted information and—without needing to decrypt—could continue to send a particular order to the supplier, thereby ordering products over and over again under the same name and purchase information. The nonce is used to give 'originality' to a given message so that if the company receives any other orders from the same person with the same nonce, it will discard those as invalid orders.

A nonce may be used to ensure security for a stream cipher. Where the same key is used for more than one message and then a different nonce is used to ensure that the keystream is different for different messages encrypted with that key; often the message number is used.

Secret nonce values are used by the Lamport signature scheme as a signer-side secret which can be selectively revealed for comparison to public hashes for signature creation and verification.

Initialization vectors[edit]

Initialization vectors may be referred to as nonces, as they are typically random or pseudo-random.

Hashing[edit]

Nonces are used in proof-of-work systems to vary the input to a cryptographic hash function so as to obtain a hash for a certain input that fulfills certain arbitrary conditions. In doing so, it becomes far more difficult to create a "desirable" hash than to verify it, shifting the burden of work onto one side of a transaction or system. For example, proof of work, using hash functions, was considered as a means to combat email spam by forcing email senders to find a hash value for the email (which included a timestamp to prevent pre-computation of useful hashes for later use) that had an arbitrary number of leading zeroes, by hashing the same input with a large number of nonce values until a "desirable" hash was obtained.

Similarly, the bitcoin blockchain hashing algorithm can be tuned to an arbitrary difficulty by changing the required minimum/maximum value of the hash so that the number of bitcoins awarded for new blocks does not increase linearly with increased network computation power as new users join. This is likewise achieved by forcing bitcoin miners to add nonce values to the value being hashed to change the hash algorithm output. Because cryptographic hash algorithms cannot easily be predicted based on their inputs, this makes the act of blockchain hashing and the possibility of being awarded bitcoins something of a lottery, where the first "miner" to find a nonce that delivers a desirable hash is awarded bitcoins.

See also[edit]

References[edit]

External links[edit]

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license