# All Questions

139 views

### Same Size Crypto Algorithm?

I need to know there is any algorithm that crypts data in same size, Any knowledge appriciated! Thank you!
507 views

### How many possible combinations of input files are possible using a 63-bit length?

I'm trying to calculate how many possible combinations of files there can be using a signed 64-bit file length, but can't seem to find a formula (or I'm using the wrong keywords). For example, the ...
96 views

### List of available symmetric & assymetric ciphers [closed]

I was looking all over the Internet list of ALL existing symmetric and asymmetric ciphers. I know that there's, for example, AES, DES, Blowfish, DSA. But how about more? Where to find such list?
67 views

### Can someone explain how this unpadded RSA formula works?

Taken from http://en.wikipedia.org/wiki/Homomorphic_encryption, $\mathcal{E}(x_1) \cdot \mathcal{E}(x_2) = x_1^e x_2^e$ $\bmod\; m = (x_1x_2)^e \;$ $\bmod\; m = \mathcal{E}(x_1 \cdot x_2)$ What is ...
126 views

### Perfect Secrecy, two Definitions

I'm reading the proof of the implication "Def 2.1 $\Rightarrow$ Def 2.4" in these slides about Adversarial Indistinguishability and Perfectly-Secret Encryption. I have a doubt in the slide 10. Here it ...
535 views

### Where to store the private key and the public key in a communication protocol

I want to create a simple secured connection protocol over TCP/IP. I just want to connect from my mobile device to a server securely. Firstly I thought to use an SSL connection, but I changed my ...
635 views

### Algorithm/Technique for Steganography [closed]

What is the most used Algorithm/Technique in Steganography? I made some research about the algorithm/technique and I think Least Significat Bit(LSB) is the most used algorithm, is there any more ...
140 views

### What is the most paranoid way to exchange messages? [closed]

I'm looking for a way for Alice to send a message or a file to Bob in the most paranoid way possible (over the internet). It can be asymmetric or symmetric. But According to some articles, AES ...
86 views

### Cryptographic Primitive Method

Is there any cryptographic primitive bijective (one-to-one and onto) function for creating cryptographic tools like symmetric encryption/decryption, Hash code generator, MAC, HMAC and Random number ...
61 views

154 views

### AES implementation in java that allows key of 320-bit length [closed]

I need an implementation of AES(Rijndael) in java that allows use of a 320-bit key. Please suggest a reliable implementation
84 views

### use the same pad reversed

Suppose I have a random number (eg 625 467 921). I use it once to encrypt a message OTP style, and when I want to use them again, I reverse them (eg to ...
187 views

### Encrypting with private key in Public Key InfraStructure [closed]

In Public key infra structure, The MD5 of the data is encrypted with private key of sender and this encypted md5 along with the data is again encryted using AES or 3DES algo. here key used to encrypt ...
499 views

### Advantages of each encryption mode [closed]

What is the advantages of each encryption mode to other encryption mode.. for example what are advantages of CBC to PCBC, CBC to CFB just like that. so that I can filter what would be the best ...
32 views

### what is the encryption type [closed]

i tried every method but i found nothing what is the encryption method thi is the hash : 85tOoZypnY6HpqvTjNZm+g15iT0F8kTikowC8uoMyac= and is any online encryption detector ?
128 views

### Can someone tell if my Hand Cipher is secure? [closed]

In easy steps, this is how it works: Convert txt to numbers. mod 1-26. Generate random numbers (by my other cipher) equal to plain txt. Write random numbers under txt numbers. Like this: ...
156 views

### How to calculate cycles per byte [closed]

I have this data: processor clock frequency: 2,1 ghz message length: 16 byte Speed: 4,3 Mbytes/s how can calculate cycles and cycles per byte?
215 views

### Decrypting encrypted files if i have the original files(Plain Text attack) [closed]

I have the following A Encrypted file and the same file in its original(not encrypted) form Now will it be possible to find the encryption/decryption key by comparing the the above two files are ...
234 views

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161 views

### Does a playlist of songs or movies mixed together contain enough random enough for OTP key material?

Ok hypothetical scenario. Lets say I want to generate a lot of key material quickly for a one-time pad. This key material will be divided up and used for many different messages in the future. I ...