The format-preserving tag has no wiki summary.
16
votes
1answer
343 views
Selective format-compliant JPEG encryption?
I am working towards building a format-compliant encryption system for pictures. The aim of it is to be able to obscure specific areas of a picture (i.e. faces, car license numbers...) while keeping ...
1
vote
3answers
298 views
Relative security of a Vigenère cipher
Within a closed computer network, I am ciphering some plaintext data as an added security measure. This is below several other layers of protection. For various technical reasons, I am restricted to ...
2
votes
1answer
395 views
Format-preserving encryption implementations
I'm looking for a general, free implementation of Format-preserving encryption
as described in this article and on wikipedia.
Possibly in a well established cryptography toolkit.
My intention is to ...
2
votes
2answers
228 views
What algorithm would give the shortest ciphertext for very short plaintexts?
I have to encrypt some very short messages (approx. 5 characters) and I would like the ciphertext to be as short as possible. I am currently using AES but the initialization vector (IV) is making my ...
5
votes
3answers
428 views
Encryption algorithm that produces dummy output on incorrect passwords
Background:
I've been thinking about using encryption in the context of backing up files to untrusted locations (to the point of making the file publicly and widely distributed for practically ...
10
votes
3answers
711 views
Can you create a strong blockcipher with small blocksize, given a strong blockcipher of conventional blocksize?
Suppose I want a strong 20-bit blockcipher. In other words, I want a function that takes a key (suppose the key is 128 bits), and implements a permutation from 20 bits to 20 bits. The set of ...
