# All Questions

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### How to do Client SSL Authentication using a USB security token?

Firefox has ability to import pfx files (containing certificates and private keys) & use imported certificates in a two-side SSL. Now I've a certificate & its corresponding private key in a ...
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### Continued Use of Kerebos

I'm not entirely sure this is the correct forum, as opposed to Security.SE, so if someone wants to migrate it over I have no complaint. I was recently looking through the Mac OS X 10.10 source code ...
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### What, cryptographically speaking, is a “long message”?

I have read about long message attacks on some cryptographic hash functions. However, I don't quite understand what is being referred to as a "long message". Also, do long message attacks only apply ...
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### CRC32 vs. low 32 bits of cryptographic hash

I was having a discussion with a colleague yesterday whose education and experience exceeded mine. He said something yesterday that sounded incorrect to me intuitively, but I don't have the knowledge ...
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### what is contained in a public key certificate

Public key certificate is a digitally signed document which verifies the sender is indeed the person. May I know how can the receiver tell the sender is indeed the person solely based on information ...
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### Simplest code for 64-bit block RSA-like encryption/decryption and key generation

Looking for the simplest code in C. Need a set of functions that will first generate a public/private 64-bit key pair, and then the function to code/decode a given 64-bit block, no built-in checksum ...
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### Is storing HMAC key in a key file safe?

In an encryption implementation, a key file contains a header with some information required by the encryption algorithm, (mode, engine, padding etc.), and an amount of p-rand used for key and vector. ...
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### Type of cipher used where ciphertext has no discernible pattern, spaces. Type?

What type of cipher could give ciphertext where for example random ASCII chars between say F-z (symbols and numerals inclusive), but with only a few spaces? Frequency of chars shows some similarities ...
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### signed message susceptible to block re-ordering , block deletion , block replication

We would implement a Public Key Cryptography (PKC) based digital signature by breaking the message into blocks and signing each block independently. One of the issues associated with digital ...
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### CBC MAC forging

Could someone please explain how one can forge a MAC in the following scenario :Suppose Alice is using CBC-MAC with AES-128 is used and decides to change the IV for every message
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### ?, software/hardware solution(s) for encrypt/decrypt of NAS(s)/SAN(s) that vary in size. LUNs are 4tb+ [migrated]

well hello newbie..first of...with truecrypt & bitlocker totally out of the question (the security issues), what software solution would you recommended to be used to encrypt/decrypt (on the fly ...
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### RSA Decryption given n, e, and phi(n)

my cryptography professor gave us this problem for extra credit a while back and I attempted it but I didn't get it correct. I have gone back to it, but I'm even more lost now than I was the first ...
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### AES— Brute force attack versus Known plain text attack

I am taking a codes and cryptology course and the following is a questions on a past exam that I could not and still can't solve: ...
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### Why is it hard to calculate Logarithm on Diffie Hellman?

i read something about Diffie Hellman. What i don't understand: Alice selects a randomly generated Number, calculates X = g^x mod p and sends X to Bob. If she calculates g^x, she needs to calcluate ...
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### How to add our created session encryption algorithm to (major) browser using OpenSSL [migrated]

I am new to OpenSSL and have theoretical information in SSL protocol . I have task to create a certificate who uses RSA algorithm for symmetric session key exchange and use my own my encryption ...
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### Are there any many to one encryption frameworks available?

I am reasonably new to the cryptography. For my use-case I need a method where in I would need a receiver to accept encrypted messages from a range of senders (each having their own, say, public key). ...
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### Client-server communication

The base scenario goes as follows: A program stores some user's confidential data encrypted on their disk. The user is most probably clueless and the disk might get stolen, but these are the classical ...