Recent questions tagged cryptography

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cryptography - Node.js Crypto, what's the default padding for AES?

I've traversed the Node.js Crypto documentation but still couldn't find the default padding used by the Cipher class ... on this will be great! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Android: CipherStream-API for AEAD Ciphers inacceptable slow

We are having an android app which a decrypting and encrypting large (up to 100MB) files over HTTP-Streams. ... GCM with a streaming API? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - what is wrong with my ripemd160 python code?

everything i have tried has given me wrong output values. i even copied C codes and changed them so ... ' # its always false See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - AES-256/CBC encryption with OpenSSL and decryption in C#

I am a newbie to cryptography. My requirement is to decrypt/encrypt the text that is encrypted/decrypted using openssl ... is 16digits Thnx ... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Cross-platform cross-language cross-everything actually deterministic random number generator

I'm looking for an algorithm to generate random numbers from a given seed but with the particular requirement ... on a different implementation. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - OpenSSL ECDSA signatures longer than expected

I am attempting to generate "raw", unencoded ECDSA signatures for use with a cryptographic chip. The goal is to ... can use with this scheme? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Java Retrieve the actual value of the public key from the KeyPair object

I wanted to ask how to retrieve the actual values of the private and public keys from the ... sun.security.rsa.RSAPrivateCrtKeyImpl@35e71 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Java Retrieve the actual value of the public key from the KeyPair object

I wanted to ask how to retrieve the actual values of the private and public keys from the ... sun.security.rsa.RSAPrivateCrtKeyImpl@35e71 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - For AES CBC encryption, whats the importance of the IV?

What is the security threat of always using all zeroes for the IV? If it allows the encrypted text to be ... would an IV still be necessary? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Java Card DES generator applet output is different from online-tools output

The below applet is written to do a DES encryption/Decryption on the APDU data field : package cryptoPack; import ... does the online tool use? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - How to compute RSA-SHA1(sha1WithRSAEncryption) value with OpenSSL

I'm confused about RSA-SHA1, I thought it's RSA_private_encrypt(SHA1(message)). But I can't get the correct ... value. Is there anything wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Using AES encryption in .NET - CryptographicException saying the padding is invalid and cannot be removed

I wrote some AES encryption code in C# and I am having trouble getting it to encrypt and decrypt properly. If I ... " + enc.DataString); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - How to store and reuse keypair in Java?

I am wanting generate a keypair once and reuse it. public static KeyPair generateKeyPair() throws Exception { ... I go about this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - How to store and reuse keypair in Java?

I am wanting generate a keypair once and reuse it. public static KeyPair generateKeyPair() throws Exception { ... I go about this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - PBKDF2-HMAC-SHA-512 test vectors

I have not been able to find published test vectors for PBKDF2-HMAC-SHA-512. I've built a function that (finally!) ... da ea 97 24 a3 d3 b8 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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578 views

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cryptography - How to Generate HMAC MD5 In Android?

I am new in this Field!I have this Message and Key also i want HMAC MD5 using this two so how it is ... ://hash.online-convert.com/md5-generator See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - What is the difference between a non-secure random number generator and a secure random number generator?

As the title says: What is the difference between a non-secure random number generator and a secure random number generator? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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725 views

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cryptography - MD5 Hash and Base64 encoding

If I have a 32 character string (an MD5 hash) and I encode it using Base64, what's the maximun length of the encoded string? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - How can I check INITIALIZE UPDATE and EXTERNAL AUTHENTICATE correctness?

I sent 80 50 00 00 08 00 00 00 00 00 00 00 00 [INITILIZE UPDATE Command] via opensc-tool to my java ... GPJ output] give us two host cryptogram? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - What are the important points about cryptographic hash functions?

I was reading this question on MD5 hash values and the accepted answer confuses me. One of the main ... hard (collision resistant property). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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489 views

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cryptography - Reasons why SHA512 is superior to MD5

I was wondering if I could reasons or links to resources explaining why SHA512 is a superior hashing algorithm to MD5. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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662 views

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cryptography - How to Encrypt or Decrypt a File in Java?

I want to encrypt and decrypt a file in java, i had read this url http://www-users.york.ac.uk/~mal503 ... catch block e.printStackTrace(); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Rfc2898 / PBKDF2 with SHA256 as digest in c#

I want to use Rfc2898 in c# to derive a key. I also need to use SHA256 as Digest for Rfc2898. I ... short of implementing it from scratch)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Recommended Python cryptographic module?

I've been exploring what cryptographic modules are available to Python, and I've found 3: ezPyCrypt, yawPyCrypt and ... and have access to GPG. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cryptography - Can one encrypt with a private key/decrypt with a public key?

[Disclaimer: I know, if you know anything about crypto you're probably about to tell me why I'm doing it ... " involved that would be useful! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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474 views

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cryptography - What RSA key length should I use for my SSL certificates?

I'm in the process of creating a CSR, and I wonder which is arguably the best length for my RSA key. Of ... (for example an e-commerce site) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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460 views

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cryptography - What is the Difference between a Hash and MAC (Message Authentication code)?

What is the Difference between a Hash and MAC (Message Authentication code)? By their definitions they seem to ... what the difference is? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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423 views

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cryptography - How to store Session ID securely

I am a student learning about cryptography. After searching online, I am still unable to find an answer to ... to your helpful answers. Cheers See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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