Linked Questions

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recover plain text from cipher text in AES-128 ECB mode [duplicate]

I have a scenario where I do not have the key but I have plaintext 1, ciphertext 1, and ciphertext 2. Ciphertext 2 is built using the same key that was used to build ciphertext 1. Is there somehow a ...
Sarada's user avatar
  • 1
2 votes
1 answer

Is a Test Vector feature a Security Hole?

I have a system where a block cipher key (likely AES) is entered via a 'command line' over a serial console, probably as hex. The system has no 'print key' feature, so the key is hopefully 'ingest ...
tobermory's user avatar
0 votes
1 answer

Safety of encryption when knowing part of the content [duplicate]

I want to encrypt a JSON file while exposing its interface (the name of the object fields) in clear text. Since this exposes part of the content of the file, my guess is that an attacker could use ...
SystematicFrank's user avatar
0 votes
1 answer

Is it safe to store AES encrypted string and the original string in plaintext next to each other?

I have a server app that stores encrypted payload ($textPayload) that users encrypted on their side (The server is just stores is and serves it). Users can use ...
Vojtech B's user avatar
  • 103
0 votes
0 answers

Is it possible to recover the key to a decrypted file? [duplicate]

Is it possible to recover the key to a decrypted file if you have the initialization vector and it uses RijndaelManaged in CBC mode? If so how? The file I want to recover the key from is a xml that ...
lovemyencryptedxml's user avatar
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0 answers

Aes brute force when part of data known [duplicate]

I have buffer of 16 bytes that encrypt with AES 128 cbc with IV =000000......(all IV is 0) I have the encrypted buffer, and I know 7 bytes from 16 bytes before the encryption , I dont know the key . ...
Keystone's user avatar
  • 101
3 votes
2 answers

An unbreakable Hill cipher?

Why don't we use a Hill cipher of 100 × 100? Or even bigger? That would be close to unbreakable. The number of possible keys in a 2 × 2 Hill cipher is 157248. For 100 × 100 the number is beyond limits....
Manoharsinh Rana's user avatar
1 vote
1 answer

Is it possible to do a known-plaintext attack with this set up of AES CTR mode?

Is it possible to perform a known-plaintext attack to extract the key from AES byte encryption? The encryption is setup with the following two lines: ...
Silvia Inden's user avatar
15 votes
2 answers

How reassuring is 64-bit (in)security?

In Feb 2017, CWI and Google announced SHAttered hash collision attack on SHA1, which took $2^{63.1}$ work estimated 6500 CPU years, to achieve. Therefore, 64-bit should be considered now an insecurity....
DannyNiu's user avatar
  • 9,451
22 votes
4 answers

How long would it take to brute force an AES-128 key?

How long would it take to crack a AES-128 key using the most advanced technology currently available? The hardware can be anything, be it a high-performance CPU, GPU or even FPGA?
Joy's user avatar
  • 321
4 votes
2 answers

Determine AES key given encrypted and unencrypted files

Given an encrypted file, the original unencrypted (cleartext) file, and knowledge of which AES encryption algorithm was used, is it possible to determine the key that was used to encrypt the data in a ...
andrewgu's user avatar
  • 143
70 votes
3 answers

Why shouldn't I use ECB encryption?

I'm using Java to generate encrypted strings, and I get this warning at build time: ECB encryption mode should not be used So I'm wondering why I shouldn't use ECB and what I can use instead?
Rogue's user avatar
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