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Results tagged with encryption
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user 48404
Encryption is the process of transforming plaintext using a cipher into ciphertext to make it unreadable to anyone except those possessing the key. Decryption is the process of transforming that ciphertext back into plaintext, using the key.
5
votes
Accepted
Dead-Man's Switch Cryptography?
The scheme you propose is not possible as far as I know. This is because $enc(M)$ has to be known for the dead-man's switch to operate (in a time capsule like way, as you described), but there is no w …
- 2,480
4
votes
Encrypted TrueCrypt HDD and processor performance
This all depends one the processor model used. Some processors have built-in acceleration for certain cryptographic primitives; AES-NI is one you mentioned that exists in Intel processors.
Even then, …
- 2,480
6
votes
Reversing decryption function involving XORs and bit rotations?
I'll demonstrate a "brute" way of doing it; should work for any XOR-rot system. Please note that indices are $\bmod 32$.
You basically write your equation in 32-vector and matrix notation:
$$
\bar{y …
- 2,480
1
vote
The input parameters of AES encryption / decryption
Both Rcon and the S-box are used in the encryption process, but are not considered "parameters" to the AES cipher; rather think of both as steps in the AES encryption and decryption processes. … An important note: something that you might consider as an input to the AES encryption/decryption system is a block mode of operation, and sometimes this mode requires an additional input value; the so …
- 2,480
2
votes
For elliptic-curve cryptography, does a 256-bit key imply that $x$ and $y$ are each 256-bits...
I'll take as example Curve25519. The order of the field is $N=2^{255}-19$. This means that the coordinates of a curve point $(x,y)$ both are a number $[0, N-1]$. Encoding such a number takes $\log_2{N …
- 2,480
21
votes
Accepted
Why are ed25519 keys not recommended for encryption?
Note that this is never defined in terms of encryption. Let me stress this: if you have a teacher that claims that "a signature is an encryption with a private key", they are wrong. … , the operator for text-book signatures is the same operator as for encryption, with the key material swapped. …
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