Small and/or fast ciphers and other cryptographic primitives designed for use in constrained environments, such as embedded MCUs and smart cards.

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What is the lightweight key exchange protocol of choice?

Assume I have to implement a secure channel protocol by myself. Assume further that for some obscure reasons (library restrictions?) I can't use any of the pre-made libraries for SSH, TLS and such. ...
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Differential Cryptanalysis

How do I find the differential characteristics using techniques Shrinking ? How do I extract the key on Differential Cryptanalysis using the technique Shrinking in Blockcipher Algorithm? Shrinking ...
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Lightest symmetric, fixed key, “Format preserving Encryption” algorithm?

message m = 49 bit string key k = any format but fixed Ciphertexts should be 49 bits long. Are there several "Format Preserving Encryption" algorithms? I want an algorithm that is as light as ...
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caesar cipher implemention and exection

I am trying to run one of the caesar cipher from https://competitions.cr.yp.to/caesar-submissions.html I have got the code for the cipher from https://github.com/floodyberry/supercop Can anyone help ...