Questions tagged [cryptography]

Cryptography is the practice and study of logical means used to achieve information confidentiality, integrity and authenticity. It covers, among other things, encryption (making some data unreadable except for those who know a given secret element, called a key), data hashing (in particular for password storage) and digital signatures (provable integrity and authenticity with non-repudiation).

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Private Blockchain VS regular Public-key cryptography [closed]

Private Blockchain (permissioned) VS regular Public-key cryptography: What is the need and add-value of a private blockchain (permissioned) if one can use normal regular public-key cryptography?
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Collision Free and Keyed-Hash Message Authentication Code [closed]

What is Collision Free? And how does it work? What is HMAC(Keyed-Hash Message Authentication Code)? And how does it work? How authentication can be achieved with HMAC?
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does anyone know how this text is encrypted? [closed]

Im trying to solve a copher challange, but i have no idea on this question. does anyone have any ideas on the encryption method used here? Dvoo wlmv, blf'ev hloevw xrksvi xszoovmtv mfnyvi gdl. Gsrh ...
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Hashing, then encrypting the data combined with the hash, using the hash as the key [closed]

I have the following idea for a hash algorithm: Take a string called string. Hash it and get hash. Insert (uniformly? randomly? in a pattern based on some value of the hash itself? something more ...
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1answer
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Encrypted key..very small [closed]

If I was given an encrypted key (presumably a private key) and it was only 64-bits in len, how would one go about decrypting it without the password? In addition to cracking it, I am trying to ...
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Steganograpjy or Digital Watermarking [closed]

I would like to use the best algorithm to hide 1024-bits inside an image. What is the best option to implement this? Is it by using Steganoraphy (i.e. LSB) or Digital water marking?
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Any good products that could crypt the files stored in laptops? [closed]

Thefts of laptops have become very common at my place, and losses of sensitive information is a a major concern for my businesses. So I wonder if there is any good products out there that could crypt ...
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Using 128-bits as an input for hashing using SHAKE-3 (128-output)

I would like to know the time estimate for a brute force attack to break my input (128-bit) which means 2^128 possibilities are there. Any online tool for that or any article which talks about that?
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How to encrypt/decrypt with only encryption hardware?

Alice and Bob have agreed a symmetric key to be used for encrypting messages to be sent over an insecure (wrt a passive adversary) communication channel. Both of them have hardware devices for ...
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Protection of online image file (ancient manuscript) [duplicate]

I am going to protect an image file (ancient manuscript) which will be available online for everyone to download. I want to protect the file in these situations: When it's on the server, I need to ...
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What is the most crypto-resistive algorithm to safely send information? [closed]

What algorithm is the best to use for storing, sending passwords, account data, and other information between desktop apps over the network. Looking for the best crypto-resistive algorithm to use in ...
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Is cryptography the same as Obfuscation? [closed]

Obfuscation is the transformation of data, but as I understand it, obfuscation permanently transforms data while encryption just encrypts it and can be decrypted with a secret key later. So is ...
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Can someone tell me what is this encryption method? [duplicate]

DQUC//S+y9uZxanuAS0WTQBlAG4AZQBkAHwBZQByACAAegBhAGQAYQBEASAAVwBpAG4AZABvAHcAcwAC3/...
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323 views

Why don't we encrypt punctuation?

I am reading about encryption, and I'm curious why in all of the examples and texts, we do not encrypt the punctuation marks. Plain text: hello world! my name is alice and i'm writing a super secret ...
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What is the most secure way to protect a custom CMS from infiltration? [closed]

I have a custom CMS with a randomly generated ASCII 100-character string from this site for both my username/password. I also have this following sha512 encryption system, which was created by ...
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Asymmetric encryption algorithms [closed]

What are the best asymmetric encryption algorithms out there? I am trying to use RSA in my project howoever I have read that it is not quite secure as other asymmetric encryption algorithms.
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How secret key is sent in cipher-texts?

I am trying to understand how encryption works. My understanding is that the key is sent with the cipher text. If this is true, I do not understand how an attacker could not get the key. If it is ...
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412 views

LTE Security: What kind of cryptograpy could be used to fix layer 2? [closed]

New attacks on LTE: https://thehackernews.com/2018/06/4g-lte-network-hacking.html https://www.alter-attack.net/media/breaking_lte_on_layer_two.pdf Layer two (data link) does not guarantee the ...
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What is the excellence of RSA vs my algorithm [closed]

I was wondering that what make RSA Asymmetric Cryptography Algorithm special. So I wrote a very simple algorithm that do the same work (Generate Public and Private Key) Now I want to ask you that What ...
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696 views

Base64 Decoding [closed]

00CDu000000000000000000000000000006e0QW00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001W00000000000000000000000000000000000000000 ...
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create a variants of MD5

I have also asked similar q here : To create a variants of MD5, I made following changes : MD5 uses a non-linear sin(i)* pow(2,32) ----> i plane to use cos(i)*pow(2,32) Instead ...
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Alternative for cryptography

Is there any alternative for cryptography? I heard a lot about quantum cryptography, but is this the only stuff which have a chance to exist in the future? Are there any other kinds of cryptography?
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Would this kind of encryption be good at anything?

I have put much thought into this very simple algorithm and I have no clue if it was thought before... But I think it should have. I also know nothing about other encryption algorithms so I can't tell ...