Tagged Questions

Encryption is the process of transforming information (called plaintext) using an algorithm (called cipher) to make it unreadable to anyone except those with special knowledge (often called a key). Conceptual questions about encryption may get better answers on crypto.stackexchange.com.

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Encryption dont work On android 4

I use crypto for encryotion and decreyption data , and use SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); this aloghoritm work on all verjons of ...
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Decrypting php encrypted file [on hold]

This is a php file which is encrypted, does anybody know how to decrypt it to normal? I doubt that it is doing something bad,otherwise why they only encrypt this file. <?php if ...
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Leading to same value on Decryption with DESede CBC NoPadding

I am asked to verify if the encryption is working ok. I am given input hex text of 238 bytes. Asked to use DESede/CBC/NoPadding algorithm. I am also given encrypted value. Of course, I am given key ...
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23 views

Books (about computer, coding,…) that are as enjoyable as a fiction, but as deep as a textbook?

Recently I have read two books of this kind, and I loved them both whole heartedly. I am desperately looking for more! "Code: The Hidden Language of Computer Hardware and Software" about computer ...
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2answers
20 views

Using Apple NSKeyedArchiver class without encryption to save score data locally

I want to post here a question that I have posted on IT Security but without answers :( I have a question about the security of NSKeyedArchiver, a subclass of NSCoder of Apple Foundation.framework ...
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0answers
28 views

Possibility of Database Breach [on hold]

I am working on a web app for a student group at my university that helps keep track of attendance as well as a few other things. It will collect data such as names, location, and email. The thing ...
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3answers
27 views

are public key and private key generated using same algorithm? [on hold]

Can a message that encrypted by public key decrypts by private key? Can a message that encrypted by private key decrypts by public key ? Are public key and private key generated using same algorithm ...
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1answer
16 views

length of password in cryptographic encryption [on hold]

All the symmetric algorithms out there come along with a key size like 128bit oder 256bit etc. I think the password gets hashed before the algorithm uses it so that it has this certain length of x ...
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1answer
11 views

prevent DESCryptoServiceProvider to generate special characters

i am using following encryption method to encrypt a string private static byte[] mKey = { }; private static byte[] mIV = { 89, 23, 13, 17, 69, 32, 02, 79 }; private ...
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1answer
26 views

How fast can AES be decrypted?

I'm asking myself how fast the decryption of AES works. I need a value to be able to estimate the time that brute forcing would need. In Wikipedia they say that GPUs are able to try out a billion of ...
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3answers
31 views

Removing PDF password protection, knowing the password

I have a bunch of pdf's I want to remove passwords from. Note that I know the password, so no need for brute forcing. I am working on a mac, so I would like to make an app to remove those passwords. ...
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2answers
28 views

How to encrypt/decrypt chunks/blocks of large files using AES, CCrypt on iOS?

I am using AES 256 for Encryption Decryption, I have bigger files about 1 - 2 GB it should go through Encryption and Decryption Process , while doing encryption of downloaded files I receives the ...
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1answer
36 views

NsisCrypt returns “Error while acquiring Windows CryptoAPI context” on all but development machine

I'm trying to use the NsisCrypt plugin to encrypt a couple of passwords before writing them to a config file. I have the following code in my installer script: StrCpy $algorithm "3des" ...
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1answer
48 views

CryptAcquireContext and CryptDeriveKey x64 mode

Delphi Xe4. Test on Win7Pro x64, Win8Ent x64, WinSrv2012; Const CGuAdvapi32dll=WinApi.Windows.Advapi32; CALG_MD2 = 32769; CALG_MD4 = 32770; CALG_MD5 = 32771; CALG_SHA = 32772; ...
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1answer
22 views

Encrypt it in C# then Decrypt it with Android ( AES | IllegalBlockSizeException )

I have an application in C# that encrypt my files with AES algorithm with this method: // strKey = "sample-16chr-key" private static void encryptFile(string inputFile, string outputFile, string ...

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