How large is the Playfair cipher keyspace?
35301
How many keys does the Playfair Cipher have?
15614
Why does the padding in Merkle–Damgård hash functions like MD5 contain the message length?
39130
What should be the size of a Diffie-Hellman private key?
139707
How many RSA keys before a collision?
153927
What size should the HMAC key be with SHA-256?
121664
Is `long` guaranteed to be at least 32 bits?
145696
Is there a way to find $a$ and $b$ keywords in an affine cipher when only ciphertext but no plaintext is known?
138951
Affine cipher: calculate the key from a known plaintext/ciphertext pair
43473
Turning a cipher into a hashing function
39396
Breaking a small-scale Example Diffie-Hellman?
105871
Length of message in RSA and splitting of long messages
2659
In RSA, how does the CPU deal with this huge modulus (8192 bits)?
57555
AES plaintext is smaller than 128 bits - how to expand?
32849
How to attack a classical cipher using known partial plaintext?
137310
Finding length of a key for a given vigenere cipher using Index of Coincidence
27686
How can I generate large prime numbers for RSA?
7264
How to jusify {e,n} is a valid RSA public key?