Recent questions tagged cryptography

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cryptography - How do one-way hash functions work? (Edited)

I read the Wikipedia article about md5 hashes but I still can't understand how a hash can't be "reconstituted" ... function makes it one-way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - MD5 hashing in Android

I have a simple android client which needs to 'talk' to a simple C# HTTP listener. I want to provide a ... application I have no control over. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - How can I generate a cryptographically secure pseudorandom number in C#?

Is there any fast implementation of cryptographically secure pseudorandom number generator (CSPRNG) for C# 3.0 ( ... for authentication tokens? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - RSA Encryption Problem [Size of payload data]

is it true that RSA encryption only can handle limited payload of data ? ... im confused with the theory ... theoretically there is no note regarding this ... Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Loading raw 64-byte long ECDSA public key in Java

I have a raw (r,s) format ECDSA NIST P-256 public key. It seems that there is no simple way to load it ... key so that it can be used to check signatures? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - C# RSA encryption/decryption with transmission

I've seen plenty of encryption/decryption tutorials and examples on the net in C# that use the System.Security. ... point me to a useful resource for this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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971 views

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cryptography - Secure random numbers in javascript?

How do I generate cryptographically secure random numbers in javascript? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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817 views

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cryptography - Why doesn't Git use more modern SHA?

I read about that Git uses SHA-1 digest as an ID for a revision. Why does it not use a more modern version of SHA? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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857 views

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cryptography - Android 4.2 broke my encrypt/decrypt code and the provided solutions don't work

First of all, I've already seen Android 4.2 broke my AES encrypt/decrypt code and Encryption error on Android 4 ... in BouncyCastle 1.34 in BouncyCastle 1.45+? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - C# Export Private/Public RSA key from RSACryptoServiceProvider to PEM string

I have an instance of System.Security.Cryptography.RSACryptoServiceProvider, i need to export it's key to a PEM ... Is there any way to generate this string? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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860 views

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cryptography - Why is XOR the default way to combine hashes?

Say you have two hashes H(A) and H(B) and you want to combine them. I've read that a good way to ... combining hash functions (rather than OR or AND etc.)? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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863 views

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cryptography - Is SHA-1 secure for password storage?

Conclusion: SHA-1 is as safe as anything against preimage attacks, however it is easy to compute, which ... be eventually turned into a first preimage attack? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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969 views

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cryptography - How to hash some string with sha256 in Java?

How can I hash some string with sha256 in Java? Does anybody know of any free library for this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Java default Crypto/AES behavior

Does anyone know what the default Java crypto behavior is for: SecretKeySpec localSecretKeySpec = new SecretKeySpec( ... when just specifying "AES". Thanks. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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901 views

1 answer

cryptography - Calculate checksum in BizTalk Orchestration Expression shape

In an orchestration I need to find out if I already processed a message before and,if so, I ... com/questions/65886886/calculate-checksum-in-biztalk-orchestration-expression-shape...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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930 views

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cryptography - How to combine a symmetric and two asymmetric encryption?

I am a beginner to cryptography and know some basic concepts of these two types of encryption algorithm. From ... 65888501/how-to-combine-a-symmetric-and-two-asymmetric-encryption...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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cryptography - Python: decode Vigenere cipher that was encoded with Affine cipher

How do I decode some text that has been encoded like this: affine(vigenere(text, vigenere_key), *affine_key)? ... /python-decode-vigenere-cipher-that-was-encoded-with-affine-cipher...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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908 views

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cryptography - Deterministic Encryption - Generating IV from password key

I need to encrypt file and directory names/paths but I need the encryption to be deterministic. I ... /questions/65648656/deterministic-encryption-generating-iv-from-password-key...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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cryptography - PKCS#1 and PKCS#8 format for RSA private key

(Closed). This question needs to be more focused. It is not currently accepting answers. question from:https:// ... /questions/48958304/pkcs1-and-pkcs8-format-for-rsa-private-key...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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cryptography - Can we have multiple public keys with a single private key for RSA?

Can we have multiple public keys associated with a single private key for RSA public-key encryption? question from:https ... -multiple-public-keys-with-a-single-private-key-for-rsa...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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cryptography - Should I use an initialization vector (IV) along with my encryption?

Is it recommended that I use an initialization vector to encrypt/decrypt my data? Will it make things more secure? ... -i-use-an-initialization-vector-iv-along-with-my-encryption...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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819 views

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cryptography - Encryption vs. digest

What is the difference between encryption and a digest? question from:https://stackoverflow.com/questions/3332662/encryption-vs-digest...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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835 views

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cryptography - Encryption vs. digest

What is the difference between encryption and a digest? question from:https://stackoverflow.com/questions/3332662/encryption-vs-digest...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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988 views

1 answer

cryptography - How to group by month-year from a differently formatted date (SQL)

I've tried to self-teach myself SQL but am struggling with a dashboard I want to build. How do I manipulate or ... how-to-group-by-month-year-from-a-differently-formatted-date-sql...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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958 views

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cryptography - How to group by month-year from a differently formatted date (SQL)

I've tried to self-teach myself SQL but am struggling with a dashboard I want to build. How do I manipulate or ... how-to-group-by-month-year-from-a-differently-formatted-date-sql...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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852 views

1 answer

cryptography - APDU to sign a digest using PIV with Yubikey iOS SDK

I am using the raw command interface exposed by the YubiKit SDK and the example on GitHub only shows how to verify a ... /apdu-to-sign-a-digest-using-piv-with-yubikey-ios-sdk...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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cryptography - Format Chainlink AggregatorV3Interface 'answer' to USD?

From the docs, AggregatorV3Interface returns.. Return Values roundId: The round ID. answer: The price. startedAt: ... with decimal and chopping off the unneeded decimal places?...

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

1 answer

cryptography - how to generate a random key for AES for python py3rijndael module

import unittest import base64 from py3rijndael import Rijndael def test_rijndael(): key = 'qBS8uRhEIBsr8jr8vuY9uUpGFefYRL2HSTtrKhaI1tk ... . could someone please help with this....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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