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Results tagged with encryption
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user 84695
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.
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Is there a difference in the security provided by a OTS vs a MTS or FTS? Or are they all jus...
The question is quite broad, but the main difference in well designed schemes should be that an OTS can be used once, FTS can be used a few times, and MTS can be used many times.
As an example, with S …
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Is this mentally computable password system, cryptographically secure? And anything like thi...
Firstly, you shouldn't really invent your own password manager, except for fun/experimentation/learning purposes. Especially if you are a beginner.
Regarding your comments, I don't really see how man …
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Alternatives to simple bit-measured security for ciphers
For a cryptographic primitive, we usually see the security level measured in bits, where n-bit security means that the attacker would have to perform $2^n$ operations to break it.
For key-derivation f …
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Can every signature scheme be transformed into a public-key encryption scheme?
No, although some signature schemes are built from public key encryption schemes, others are not.
For example, the Lamport Signature scheme. …
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Encryption in SET protocol
how the symmetric and asymmetric encryption are used in the SET protocol? … Asymmetric Encryption
SET uses a distinct public/private key pair to create the digital signature. …
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Encrypting messages without revealing length?
In a block cipher, there is a minimum length that you have to pad to, right?
A block cipher uses padding to make the plaintext a multiple of the block size. It isn't used to disguise the message le …
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Text cipher option that can decrypt the same ciphertext to two DIFFERENT and DESIRED outputs...
Ways to do this (for fun) depend on your requirements. If the passwords must be human readable then it makes things more difficult. I assume plaintexts match in size.
If passwords need not be human …
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How to securely deal cards?
I think you are looking for "mental poker".
Here is a video of Ron Rivest specifically discussing how to deal cards via mail/internet.
The paper here might also be a good read (from the creators of RS …
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Can we encrypt part of the XChaCha/XSalsa nonce?
The xChaCha cipher detailed here extends the nonce 192bits and works as follows (from the link):
Pass the key and the first 16 bytes of the 24-byte nonce to HChaCha20 to obtain the subkey.
Use the su …
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Does varying ChaCha rounds add any security?
This paper introduces 'Freestyle' a randomized, and variable round version of the ChaCha cipher. It uses the concept of hash based halting condition, where a decryption attempt with an incorrect key i …
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Would a key recovery attack on ChaCha's keystream would be made more secure with an AONT?
As per the Ron Rivest's paper All-or-nothing encryption and the package transform
We present a new mode of encryption for block ciphers, which we call all-or-nothing encryption. … We give a specific way of implementing all-or-nothing encryption using a “package transform≓ as a pre-processing step to an ordinary encryption mode. …
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Making a cipher non-malleable using a plaintext transform?
However, where authentication is not possible (perhaps in a case where one has a very limited environment on storage/CPU power), can we transform the plaintext before encryption? …
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Making a cipher non-malleable using a plaintext transform?
OAEP
Optimal Asymmetric Encryption Padding (OAEP) is a padding scheme often used together with RSA encryption. … As per the Ron Rivest's paper All-or-nothing encryption and the package transform
We present a new mode of encryption for block ciphers, which we call all-or-nothing encryption. …
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