# All Questions

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### identify how to solve this cipher please! its fun and a mystery

I have roughly 25 three digit numbers between 0 and 200, that are a cipher. if i know what some letters are (for instance a=2, c= 9, and f-3) then how can i solve for this?
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### Data corruption to protect the encryption?

On KeePass help center it's stated that: ... if the header of the database (first few bytes) is corrupted, you're out of luck, too: the repair functionality won't be able to restore any entries (...
• 57
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### Does the p value in randomness tests provide any real value?

In the dieharder test suite there are things like:- diehard_3dsphere| 3| 4000| 100|0.56011310| PASSED and in the NIST IID (brief mode) and randomness ...
• 14k
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### Why are ZK proofs so dominant in verifiable computing?

There seem to be many ways of verifying computation, and many classes of interactive proof systems which aren't ZK. That being said, most "validity proofs" in blockchain (which seems to be ...
• 11
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### Hash tree that covers 16 data block

For a hash tree that covers 16 data blocks, how many hash checks do you need to perform to localize the error? Assume that error occurred on only one block.
128 views

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### Elgamal Problem, cant find the right answer, If anyone could help, would appreciate it [closed]

Joe has a public and private key pair (u𝑘𝐴, p𝑘𝐴) for ElGamal signature. Suppose that Joe signs a message for Arthur every day. If Joe uses the same random number 𝑘 in all signatures. Analyse the ...
• 1
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### Encrypting data before Saas-solution

The compliance department is asking me for recommendations on encrypting data before Saas-solutions. Meaning that the Saas-solution should not be able to see the data when stored and processed. ...
36 views

### Difference between DSA and RSA in terms of signature generation

For DSA, if the same message is signed multiple times on different occasions, the signatures will differ because the random value k is generated for each signature. This is not true of RSA signatures....
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1k views

### is XChaCha20 stronger than ChaCha20?

Some of the encrypted messenger apps and password managers use extended version of Bernstein's ciphers and some of them not. Viber-Salsa20 Wire-ChaCha20 Threema-XSalsa20 Sid-Salsa20 Nordpass-XChaCha20 ...
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### RSA / RS256 Encryption with the public key I have

safe to say I'm a complete beginner when it comes to cryptography... I believe the example output below is some sort of RSA (or RS256) encrypted string, and was just curious whether it'd be possible ...
• 101
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### Clarification for CCA security (or - why is the following not a Rabin CCA attack?)

In three different, highly reputable sources (e.g. "Introduction to Modern Cryptography" by Katz and Lindell, 2007), the definition of CCA attack doesn't allow the adversary to decrypt the ...
• 215
1 vote
51 views

### Is ChaCha20 + HMAC(SHA3) output indistinguishable from randomness?

I was wondering, if the output of following type of ChaCha + HMAC scheme is indistinguishable from randomness: ...
1 vote
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### Clarification regarding Rabin Cryptosystem being CPA (Chosen Plaintext Attack) secure

Do I understand correctly that the textbook Rabin encryption scheme, where there is no random padding (as is also required in RSA for it to be CPA secure), is not CPA secure? (it is deterministic ...
• 215
1 vote
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### Why Can't I Use an Nacl Sign Keypair for Encrypt and Decrypt Operations?

I'm aware that the difference between the NaCL sign keys vs the box keys is that the secret key that comes from the NaCL box keypair is the ...
48 views

### How to verify an ES256 (ECDSA using P-256 and SHA-256) signature with window.crypto.subtle? [closed]

I'm having trouble figuring out the right parameters to verify a ES256 signature that was created with an ECDSA P-256 public key in web crypto. Below script outputs different results for Node.js vs ...
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### Is it possible to create digital signature with specific p, q, e values by using OpenSSL?

I'm trying to create the digital signature by using these parameters and RSA algorithm: p = 645353605880701501120167331073 q = 350784310265709643169455170929 e = 19 message = "G’day mate! As we ...
43 views

• 215
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### How is Diffie-Hellman linked to AES?

I have just learnt about Diffie-Hellman and AES. However, I cannot seem to understand how they link. My initial idea was that Diffie-hellman is used to transfer a key for AES decryption. After further ...
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### Encrypt clients files and shares

I have to encrypt data (files) of client on server side and only the client can read theses files (admin can't see name and content of file). To resolve this, I have the idea to just use something ...
31 views

### Increase encryption key length in Shamir secret sharing

Can Shamir's secret sharing work on any size of key?