Encryption is the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key.

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What are the practical difference between 256-bit, 192-bit, and 128-bit AES encryption?

AES has several different variants: AES-128 AES-192 AES-256 But why would someone prefer use one over another?
19
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2answers
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How were the DES S-box values determined?

It seems like the S-boxes in DES have essentially random values. How were these chosen?
28
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3answers
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How can I use asymmetric encryption, such as RSA, to encrypt an arbitrary length of plaintext?

RSA is not designed to be used on long blocks of plaintext like a block cipher, but I need to use it to send a large message. How can I do this?
77
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20answers
11k views

Time Capsule cryptography?

Does there exist any cryptographic algorithm which encrypts data in such a way that it can only be decrypted after a certain period of time? The only idea that I can think of, is something like this: ...