Questions tagged [decryption]

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Decode/decrypt Cipher text of unknown custom algorithm [on hold]

I have a university assignment by the professor to decode unknown encoding schemes but i haven't able to decode. The message is sample of communication between Indian external affairs to different ...
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1answer
58 views

NaCl allows decryption with the same public key as for encryption

I followed the description here: Public-key authenticated encryption: crypto_box and created an example that encrypts a message with Bob's public key and signs it with Alice's secret key : ...
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encryption and decryption table [closed]

Hi Question: is there a certain formula/rule that should be followed to fill this table (or any table with different inputs for the sender encryption and receiver decryption) whether the outcome ...
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2answers
186 views

Is this toy RSA demonstration flawed?

I want to present the basics of how RSA works to an audience of beginners in cryptography. The problem is that I am lightyears from being an expert. After reading about how RSA works in wikipedia, ...
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0answers
5 views

Unable to decrypt aes-192-gcm [migrated]

I'm using nodejs to encrypt and decrypt aes-192-gcm here's my code: ...
0
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1answer
47 views

How secure is a 40 bytes hexadecimal string AES256 encrypted with 50 bytes random password

Problem Assume I have a 40 bytes hexadecimal ASCII string and a 50 bytes random password. ...
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0answers
48 views

Subexponential algorithms that apply only one of factoring and discrete logarithm?

Shor (quantum polynomial), Number Field Sieve (subexponential), Pollard rho (square root) all have both factoring and discrete logarithm over $\mathbb F_p^*$ variants. What are the subexponential ...
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1answer
51 views

Are there any asymmetric key encryption/decryption algorithms?

When it comes to encrypting some data (where data being something of a large size), symmetric key cryptosystem is predominant. Symmetric key algorithms like AES, DES, Blowfish, IDEA etc. are ...
3
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1answer
78 views

Cryptography on programming

In pursuit of understanding a randomly found topic I was interested in learning the connection between integer programming and cryptography and found Lenstra Jr.'s Integer Programming and Cryptography....
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1answer
134 views

Apple CryptoKit - Understanding its portability

I've been playing with Apple's CryptoKit (their effort to make their old CommonCrypto lib more modern and easy to use via Swift, their programming language). I'm interested to see how portable it is.....
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2answers
116 views

How to find the key of XOR encryption in Java?

I am trying to find the key of an XOR-encrypted string in Java. It is very probable that the key is eight characters long. I have the encrypted string. I do not understand how to go backwards and ...
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0answers
28 views

Does the oracle have to have access to the encryption key to the padding oracle attack to work (CBC & PKCS#7)?

Does the oracle have to have access to the encryption key to the padding oracle attack to work (CBC & PKCS#7)? I tried much to get a attach to work, but the oracle doesn't have access to the ...
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1answer
3k views

How long does it take to crack RSA 1024 with a PC?

Using an Intel Core i5 CPU, how long does it take to crack RSA using a key size of 1024 bit (generated using a secure key pair generation function)? Suppose for instance that we have thousands of ...