# All Questions

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### how to encrypt something with three different algorithms [duplicate]

Diskcryptor offer such thing to encrypt a partition with aes , twofish and serpent all at once or separate how is that work exactly??? Does it encrypt with 3 algorithms with three different keys or ...
13 views

### Transposition and Shannon theory

I want to prove that transposition algorithm is not secure based on Shannon's theory. I understand that I have to prove that p(c|m) ≠ p(c). How I can do that?
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### What is the process to get the n future key for DUKPT? [closed]

I need to get the n future key from my BDK and KSN.
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### negligible functions proofs

I'm new in cryptography field and I have few questions. How can I prove that: 1- if f is negligible and g is negligible then f + g is negligible? 2- if p is polynomial and f is negligible then f . p ...
93 views

### generate RSA public key having public modulus and exponent [closed]

i want to generate an RSA public public key file using openssl (or other tools) having public modulus and exponent, so i can use it later to encrypt files i have this: ...
84 views

### How to pronounce SHA1 and SHA2?

I'm not a native English speaker. So I want to know how to pronounce SHA1 and SHA2 like a native English speaker. Should they be pronounced as [Shar(p) One] and [Shar(p) Two]? Thanks in advance.
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### What is the meaning for a vector mod a matrix in a lattice?

I'm reading about the lattice recently.In the paper, it gives a method of a vector mod a matrix: ⃗c mod B as ⃗c−⌊⃗c×B^(−1)⌉×B = [⃗c×B^(−1)]×B. I know that a integer A mod the other integer B is ...
32 views

### different feistel words in key size

I have confusion on Feistel word in key size. Means, "what is the meaning of key size with different feistel word ?" What does m=2,3,4 represent? Where m represent different size of feistel word or ...
446 views

### Decrypted RSA 64 bit encryption using modulus and private exponent. Got gobbledygook [Verify] [closed]

As part of an experiment, I was given a .enc RSA (encrypted) file that was most likely generated using openssl. I had the public key, I factored it, obtained the private exponent, and decrypted the ...
113 views

### Vigenere ciphers : Need help for math analysis

I've been learning about Vigenere ciphers and then thought of another method to Encrypt and decrypt that. This's my method to encrypt : ...
98 views

### Generating cyclic group for Ciphertext-Policy Attribute-Based Encryption [closed]

I am doing Project under the topic CP-ABE.I need to generate a symmetric bilinear group Go of prime order p and with generator g...Then how to choose random elements from Zp....kindly anyone help ...
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### How can complexity be increased or decreased in AES?

I have been studying data compression for a while. For educational purposes, after a lot of reading, I managed to create a software that performs encryption and authentication using AES256-GCM. ...