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comment I need to know number of encryption/decryption operations?
2^224 is the brute force answer, but as @Nova posted, certain attacks are possible in certain situations. Those attacks reduce the amount of work needed to recover the key. Meet in the middle attacks take advantage of the small key size used by the primitives. But they require massive amounts of space. An attack requiring 2^112x64 bits of space will need 4.1E22 1TB hard drives to execute. As that's not exactly practical today, attackers still need to trade space for rounds of execution.
Oct
17
answered I need to know number of encryption/decryption operations?
Oct
17
reviewed Close How do you test randomness?
Oct
17
comment How do you test randomness?
See @e-sushi 's answer in the duplicate question for several good tests.
Oct
17
reviewed Close Weak key schedule IDEA
Oct
17
reviewed Close How to use the key from a Diffie Hellman exchange?
Oct
7
reviewed No Action Needed Linear transformation proof
Oct
7
reviewed Leave Open What does “nonlinear mapping” mean?
Oct
3
reviewed Reopen Question about second preimage resistance of hash function combiner
Oct
3
reviewed Leave Open RSA given q, p and e?
Oct
3
reviewed Leave Open Alternative to NSA encryption algorithm
Sep
30
awarded  Explainer
Sep
30
reviewed Edit and Reopen Is One Time Pad something like this?
Sep
30
revised Is One Time Pad something like this?
added 48 characters in body
Sep
25
reviewed Close Question about the security of Substitution-Permutation Network
Sep
25
reviewed Close Why are we advising PKI if we know that quantum computers will break them?
Sep
25
reviewed Close Using modulus in one time pad?
Sep
25
reviewed Leave Open What is the technical name for a public key container in DER format?
Sep
25
reviewed Satisfactory Secure MultiParty Computation with secret inputs for secret outputs
Sep
25
reviewed Excellent MAC using a modified CBC mode of operation